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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] mm: convert totalram_pages, totalhigh_pages and managed_pages to atomic.
On 2018-10-22 1:23 p.m., Arun KS wrote: > Remove managed_page_count_lock spinlock and instead use atomic > variables. > > Suggested-by: Michal Hocko <mhocko@xxxxxxxx> > Suggested-by: Vlastimil Babka <vbabka@xxxxxxx> > Signed-off-by: Arun KS <arunks@xxxxxxxxxxxxxx> Acked-by: Felix Kuehling <Felix.Kuehling@xxxxxxx> Regards, Felix > > --- > As discussed here, > https://patchwork.kernel.org/patch/10627521/#22261253 > --- > --- > arch/csky/mm/init.c | 4 +- > arch/powerpc/platforms/pseries/cmm.c | 11 ++-- > arch/s390/mm/init.c | 2 +- > arch/um/kernel/mem.c | 4 +- > arch/x86/kernel/cpu/microcode/core.c | 5 +- > drivers/char/agp/backend.c | 4 +- > drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 2 +- > drivers/gpu/drm/i915/i915_gem.c | 2 +- > drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 +- > drivers/hv/hv_balloon.c | 19 +++---- > drivers/md/dm-bufio.c | 5 +- > drivers/md/dm-crypt.c | 4 +- > drivers/md/dm-integrity.c | 4 +- > drivers/md/dm-stats.c | 3 +- > drivers/media/platform/mtk-vpu/mtk_vpu.c | 3 +- > drivers/misc/vmw_balloon.c | 2 +- > drivers/parisc/ccio-dma.c | 5 +- > drivers/parisc/sba_iommu.c | 5 +- > drivers/staging/android/ion/ion_system_heap.c | 2 +- > drivers/xen/xen-selfballoon.c | 7 +-- > fs/ceph/super.h | 3 +- > fs/file_table.c | 9 ++-- > fs/fuse/inode.c | 4 +- > fs/nfs/write.c | 3 +- > fs/nfsd/nfscache.c | 3 +- > fs/ntfs/malloc.h | 2 +- > fs/proc/base.c | 3 +- > include/linux/highmem.h | 2 +- > include/linux/mm.h | 2 +- > include/linux/mmzone.h | 10 +--- > include/linux/swap.h | 2 +- > kernel/fork.c | 6 +-- > kernel/kexec_core.c | 5 +- > kernel/power/snapshot.c | 2 +- > lib/show_mem.c | 3 +- > mm/highmem.c | 2 +- > mm/huge_memory.c | 2 +- > mm/kasan/quarantine.c | 4 +- > mm/memblock.c | 6 +-- > mm/memory_hotplug.c | 4 +- > mm/mm_init.c | 3 +- > mm/oom_kill.c | 2 +- > mm/page_alloc.c | 75 > ++++++++++++++------------- > mm/shmem.c | 12 +++-- > mm/slab.c | 3 +- > mm/swap.c | 3 +- > mm/util.c | 2 +- > mm/vmalloc.c | 4 +- > mm/vmstat.c | 4 +- > mm/workingset.c | 2 +- > mm/zswap.c | 2 +- > net/dccp/proto.c | 6 +-- > net/decnet/dn_route.c | 2 +- > net/ipv4/tcp_metrics.c | 2 +- > net/netfilter/nf_conntrack_core.c | 6 +-- > net/netfilter/xt_hashlimit.c | 4 +- > net/sctp/protocol.c | 6 +-- > security/integrity/ima/ima_kexec.c | 2 +- > 58 files changed, 171 insertions(+), 143 deletions(-) > > diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c > index dc07c07..3f4d35e 100644 > --- a/arch/csky/mm/init.c > +++ b/arch/csky/mm/init.c > @@ -71,7 +71,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) > ClearPageReserved(virt_to_page(start)); > init_page_count(virt_to_page(start)); > free_page(start); > - totalram_pages++; > + atomic_long_inc(&totalram_pages); > } > } > #endif > @@ -88,7 +88,7 @@ void free_initmem(void) > ClearPageReserved(virt_to_page(addr)); > init_page_count(virt_to_page(addr)); > free_page(addr); > - totalram_pages++; > + atomic_long_inc(&totalram_pages); > addr += PAGE_SIZE; > } > > diff --git a/arch/powerpc/platforms/pseries/cmm.c > b/arch/powerpc/platforms/pseries/cmm.c > index 25427a4..85fe503 100644 > --- a/arch/powerpc/platforms/pseries/cmm.c > +++ b/arch/powerpc/platforms/pseries/cmm.c > @@ -208,7 +208,7 @@ static long cmm_alloc_pages(long nr) > > pa->page[pa->index++] = addr; > loaned_pages++; > - totalram_pages--; > + atomic_long_dec(&totalram_pages); > spin_unlock(&cmm_lock); > nr--; > } > @@ -247,7 +247,7 @@ static long cmm_free_pages(long nr) > free_page(addr); > loaned_pages--; > nr--; > - totalram_pages++; > + atomic_long_inc(&totalram_pages); > } > spin_unlock(&cmm_lock); > cmm_dbg("End request with %ld pages unfulfilled\n", nr); > @@ -291,7 +291,8 @@ static void cmm_get_mpp(void) > int rc; > struct hvcall_mpp_data mpp_data; > signed long active_pages_target, page_loan_request, target; > - signed long total_pages = totalram_pages + loaned_pages; > + signed long total_pages = atomic_long_read(&totalram_pages) + > + loaned_pages; > signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE; > > rc = h_get_mpp(&mpp_data); > @@ -322,7 +323,7 @@ static void cmm_get_mpp(void) > > cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = > %lu\n", > page_loan_request, loaned_pages, loaned_pages_target, > - oom_freed_pages, totalram_pages); > + oom_freed_pages, atomic_long_read(&totalram_pages)); > } > > static struct notifier_block cmm_oom_nb = { > @@ -581,7 +582,7 @@ static int cmm_mem_going_offline(void *arg) > free_page(pa_curr->page[idx]); > freed++; > loaned_pages--; > - totalram_pages++; > + atomic_long_inc(&totalram_pages); > pa_curr->page[idx] = pa_last->page[--pa_last->index]; > if (pa_last->index == 0) { > if (pa_curr == pa_last) > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c > index 76d0708..d6529e8 100644 > --- a/arch/s390/mm/init.c > +++ b/arch/s390/mm/init.c > @@ -59,7 +59,7 @@ static void __init setup_zero_pages(void) > order = 7; > > /* Limit number of empty zero pages for small memory sizes */ > - while (order > 2 && (totalram_pages >> 10) < (1UL << order)) > + while (order > 2 && (atomic_long_read(&totalram_pages) >> 10) < (1UL << > order)) > order--; > > empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); > diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c > index 1067469..da78a06 100644 > --- a/arch/um/kernel/mem.c > +++ b/arch/um/kernel/mem.c > @@ -51,8 +51,8 @@ void __init mem_init(void) > > /* this will put all low memory onto the freelists */ > memblock_free_all(); > - max_low_pfn = totalram_pages; > - max_pfn = totalram_pages; > + max_low_pfn = atomic_long_read(&totalram_pages); > + max_pfn = atomic_long_read(&totalram_pages); > mem_init_print_info(NULL); > kmalloc_ok = 1; > } > diff --git a/arch/x86/kernel/cpu/microcode/core.c > b/arch/x86/kernel/cpu/microcode/core.c > index 2637ff0..4ccc8dd 100644 > --- a/arch/x86/kernel/cpu/microcode/core.c > +++ b/arch/x86/kernel/cpu/microcode/core.c > @@ -435,8 +435,9 @@ static ssize_t microcode_write(struct file *file, const > char __user *buf, > { > ssize_t ret = -EINVAL; > > - if ((len >> PAGE_SHIFT) > totalram_pages) { > - pr_err("too much data (max %ld pages)\n", totalram_pages); > + if ((len >> PAGE_SHIFT) > atomic_long_read(&totalram_pages)) { > + pr_err("too much data (max %ld pages)\n", > + atomic_long_read(&totalram_pages)); > return ret; > } > > diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c > index 38ffb28..2753e1d 100644 > --- a/drivers/char/agp/backend.c > +++ b/drivers/char/agp/backend.c > @@ -115,9 +115,9 @@ static int agp_find_max(void) > long memory, index, result; > > #if PAGE_SHIFT < 20 > - memory = totalram_pages >> (20 - PAGE_SHIFT); > + memory = atomic_long_read(&totalram_pages) >> (20 - PAGE_SHIFT); > #else > - memory = totalram_pages << (PAGE_SHIFT - 20); > + memory = atomic_long_read(&totalram_pages) << (PAGE_SHIFT - 20); > #endif > index = 1; > > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c > b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c > index 56412b0..ca18502 100644 > --- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c > @@ -848,7 +848,7 @@ static int kfd_fill_mem_info_for_cpu(int numa_node_id, > int *avail_size, > */ > pgdat = NODE_DATA(numa_node_id); > for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) > - mem_in_bytes += pgdat->node_zones[zone_type].managed_pages; > + mem_in_bytes += > atomic_long_read(&pgdat->node_zones[zone_type].managed_pages); > mem_in_bytes <<= PAGE_SHIFT; > > sub_type_hdr->length_low = lower_32_bits(mem_in_bytes); > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c > index 0c8aa57..b4c245b 100644 > --- a/drivers/gpu/drm/i915/i915_gem.c > +++ b/drivers/gpu/drm/i915/i915_gem.c > @@ -2539,7 +2539,7 @@ static int i915_gem_object_get_pages_gtt(struct > drm_i915_gem_object *obj) > * If there's no chance of allocating enough pages for the whole > * object, bail early. > */ > - if (page_count > totalram_pages) > + if (page_count > atomic_long_read(&totalram_pages)) > return -ENOMEM; > > st = kmalloc(sizeof(*st), GFP_KERNEL); > diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c > b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c > index 8e2e269..9ea10eb 100644 > --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c > +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c > @@ -170,7 +170,7 @@ static int igt_ppgtt_alloc(void *arg) > * This should ensure that we do not run into the oomkiller during > * the test and take down the machine wilfully. > */ > - limit = totalram_pages << PAGE_SHIFT; > + limit = atomic_long_read(&totalram_pages) << PAGE_SHIFT; > limit = min(ppgtt->vm.total, limit); > > /* Check we can allocate the entire range */ > @@ -1244,7 +1244,7 @@ static int exercise_mock(struct drm_i915_private *i915, > u64 hole_start, u64 hole_end, > unsigned long end_time)) > { > - const u64 limit = totalram_pages << PAGE_SHIFT; > + const u64 limit = atomic_long_read(&totalram_pages) << PAGE_SHIFT; > struct i915_gem_context *ctx; > struct i915_hw_ppgtt *ppgtt; > IGT_TIMEOUT(end_time); > diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c > index c5bc0b5..4498c94 100644 > --- a/drivers/hv/hv_balloon.c > +++ b/drivers/hv/hv_balloon.c > @@ -1092,6 +1092,7 @@ static void process_info(struct hv_dynmem_device *dm, > struct dm_info_msg *msg) > static unsigned long compute_balloon_floor(void) > { > unsigned long min_pages; > + unsigned long totalram = (unsigned > long)atomic_long_read(&totalram_pages); > #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) > /* Simple continuous piecewiese linear function: > * max MiB -> min MiB gradient > @@ -1104,16 +1105,16 @@ static unsigned long compute_balloon_floor(void) > * 8192 744 (1/16) > * 32768 1512 (1/32) > */ > - if (totalram_pages < MB2PAGES(128)) > - min_pages = MB2PAGES(8) + (totalram_pages >> 1); > - else if (totalram_pages < MB2PAGES(512)) > - min_pages = MB2PAGES(40) + (totalram_pages >> 2); > - else if (totalram_pages < MB2PAGES(2048)) > - min_pages = MB2PAGES(104) + (totalram_pages >> 3); > - else if (totalram_pages < MB2PAGES(8192)) > - min_pages = MB2PAGES(232) + (totalram_pages >> 4); > + if (totalram < MB2PAGES(128)) > + min_pages = MB2PAGES(8) + (totalram >> 1); > + else if (totalram < MB2PAGES(512)) > + min_pages = MB2PAGES(40) + (totalram >> 2); > + else if (totalram < MB2PAGES(2048)) > + min_pages = MB2PAGES(104) + (totalram >> 3); > + else if (totalram < MB2PAGES(8192)) > + min_pages = MB2PAGES(232) + (totalram >> 4); > else > - min_pages = MB2PAGES(488) + (totalram_pages >> 5); > + min_pages = MB2PAGES(488) + (totalram >> 5); > #undef MB2PAGES > return min_pages; > } > diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c > index dc385b7..6d61259 100644 > --- a/drivers/md/dm-bufio.c > +++ b/drivers/md/dm-bufio.c > @@ -1887,8 +1887,9 @@ static int __init dm_bufio_init(void) > dm_bufio_allocated_vmalloc = 0; > dm_bufio_current_allocated = 0; > > - mem = (__u64)mult_frac(totalram_pages - totalhigh_pages, > - DM_BUFIO_MEMORY_PERCENT, 100) << PAGE_SHIFT; > + mem = (__u64)mult_frac(atomic_long_read(&totalram_pages) - > + atomic_long_read(&totalhigh_pages), > + DM_BUFIO_MEMORY_PERCENT, 100) << PAGE_SHIFT; > > if (mem > ULONG_MAX) > mem = ULONG_MAX; > diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c > index 0481223..1c58f4c 100644 > --- a/drivers/md/dm-crypt.c > +++ b/drivers/md/dm-crypt.c > @@ -2158,7 +2158,9 @@ static int crypt_wipe_key(struct crypt_config *cc) > > static void crypt_calculate_pages_per_client(void) > { > - unsigned long pages = (totalram_pages - totalhigh_pages) * > DM_CRYPT_MEMORY_PERCENT / 100; > + unsigned long pages = (atomic_long_read(&totalram_pages) - > + atomic_long_read(&totalhigh_pages)) * > + DM_CRYPT_MEMORY_PERCENT / 100; > > if (!dm_crypt_clients_n) > return; > diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c > index bb3096b..d91c931 100644 > --- a/drivers/md/dm-integrity.c > +++ b/drivers/md/dm-integrity.c > @@ -2843,7 +2843,9 @@ static int create_journal(struct dm_integrity_c *ic, > char **error) > journal_pages = roundup((__u64)ic->journal_sections * > ic->journal_section_sectors, > PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - > SECTOR_SHIFT); > journal_desc_size = journal_pages * sizeof(struct page_list); > - if (journal_pages >= totalram_pages - totalhigh_pages || > journal_desc_size > ULONG_MAX) { > + if (journal_pages >= atomic_long_read(&totalram_pages) - > + atomic_long_read(&totalhigh_pages) || > + journal_desc_size > ULONG_MAX) { > *error = "Journal doesn't fit into memory"; > r = -ENOMEM; > goto bad; > diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c > index 21de30b..f154a07 100644 > --- a/drivers/md/dm-stats.c > +++ b/drivers/md/dm-stats.c > @@ -85,7 +85,8 @@ static bool __check_shared_memory(size_t alloc_size) > a = shared_memory_amount + alloc_size; > if (a < shared_memory_amount) > return false; > - if (a >> PAGE_SHIFT > totalram_pages / DM_STATS_MEMORY_FACTOR) > + if (a >> PAGE_SHIFT > atomic_long_read(&totalram_pages) / > + DM_STATS_MEMORY_FACTOR) > return false; > #ifdef CONFIG_MMU > if (a > (VMALLOC_END - VMALLOC_START) / DM_STATS_VMALLOC_FACTOR) > diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c > b/drivers/media/platform/mtk-vpu/mtk_vpu.c > index 616f78b..ee3654a 100644 > --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c > +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c > @@ -855,7 +855,8 @@ static int mtk_vpu_probe(struct platform_device *pdev) > /* Set PTCM to 96K and DTCM to 32K */ > vpu_cfg_writel(vpu, 0x2, VPU_TCM_CFG); > > - vpu->enable_4GB = !!(totalram_pages > (SZ_2G >> PAGE_SHIFT)); > + vpu->enable_4GB = !!(atomic_long_read(&totalram_pages) > > + (SZ_2G >> PAGE_SHIFT)); > dev_info(dev, "4GB mode %u\n", vpu->enable_4GB); > > if (vpu->enable_4GB) { > diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c > index 9b0b3fa..0ac0fee 100644 > --- a/drivers/misc/vmw_balloon.c > +++ b/drivers/misc/vmw_balloon.c > @@ -570,7 +570,7 @@ static int vmballoon_send_get_target(struct vmballoon *b) > unsigned long status; > unsigned long limit; > > - limit = totalram_pages; > + limit = atomic_long_read(&totalram_pages); > > /* Ensure limit fits in 32-bits */ > if (limit != (u32)limit) > diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c > index 6148236..705df1a 100644 > --- a/drivers/parisc/ccio-dma.c > +++ b/drivers/parisc/ccio-dma.c > @@ -1255,7 +1255,8 @@ void __init ccio_cujo20_fixup(struct parisc_device > *cujo, u32 iovp) > ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD). > */ > > - iova_space_size = (u32) (totalram_pages / > count_parisc_driver(&ccio_driver)); > + iova_space_size = (u32) (atomic_long_read(&totalram_pages) / > + count_parisc_driver(&ccio_driver)); > > /* limit IOVA space size to 1MB-1GB */ > > @@ -1294,7 +1295,7 @@ void __init ccio_cujo20_fixup(struct parisc_device > *cujo, u32 iovp) > > DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n", > __func__, ioc->ioc_regs, > - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT), > + (unsigned long) atomic_long_read(&totalram_pages) >> > (20 - PAGE_SHIFT), > iova_space_size>>20, > iov_order + PAGE_SHIFT); > > diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c > index 11de0ec..02f4ce9 100644 > --- a/drivers/parisc/sba_iommu.c > +++ b/drivers/parisc/sba_iommu.c > @@ -1419,7 +1419,8 @@ static int setup_ibase_imask_callback(struct device > *dev, void *data) > ** for DMA hints - ergo only 30 bits max. > */ > > - iova_space_size = (u32) (totalram_pages/global_ioc_cnt); > + iova_space_size = (u32) (atomic_long_read(&totalram_pages)/ > + global_ioc_cnt); > > /* limit IOVA space size to 1MB-1GB */ > if (iova_space_size < (1 << (20 - PAGE_SHIFT))) { > @@ -1444,7 +1445,7 @@ static int setup_ibase_imask_callback(struct device > *dev, void *data) > DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n", > __func__, > ioc->ioc_hpa, > - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT), > + (unsigned long) atomic_long_read(&totalram_pages) >> > (20 - PAGE_SHIFT), > iova_space_size>>20, > iov_order + PAGE_SHIFT); > > diff --git a/drivers/staging/android/ion/ion_system_heap.c > b/drivers/staging/android/ion/ion_system_heap.c > index 548bb02..64bd925 100644 > --- a/drivers/staging/android/ion/ion_system_heap.c > +++ b/drivers/staging/android/ion/ion_system_heap.c > @@ -110,7 +110,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap, > unsigned long size_remaining = PAGE_ALIGN(size); > unsigned int max_order = orders[0]; > > - if (size / PAGE_SIZE > totalram_pages / 2) > + if (size / PAGE_SIZE > atomic_long_read(&totalram_pages) / 2) > return -ENOMEM; > > INIT_LIST_HEAD(&pages); > diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c > index 5165aa8..0b925fd 100644 > --- a/drivers/xen/xen-selfballoon.c > +++ b/drivers/xen/xen-selfballoon.c > @@ -189,7 +189,7 @@ static void selfballoon_process(struct work_struct *work) > bool reset_timer = false; > > if (xen_selfballooning_enabled) { > - cur_pages = totalram_pages; > + cur_pages = atomic_long_read(&totalram_pages); > tgt_pages = cur_pages; /* default is no change */ > goal_pages = vm_memory_committed() + > totalreserve_pages + > @@ -227,7 +227,8 @@ static void selfballoon_process(struct work_struct *work) > if (tgt_pages < floor_pages) > tgt_pages = floor_pages; > balloon_set_new_target(tgt_pages + > - balloon_stats.current_pages - totalram_pages); > + balloon_stats.current_pages - > + atomic_long_read(&totalram_pages)); > reset_timer = true; > } > #ifdef CONFIG_FRONTSWAP > @@ -569,7 +570,7 @@ int xen_selfballoon_init(bool use_selfballooning, bool > use_frontswap_selfshrink) > * much more reliably and response faster in some cases. > */ > if (!selfballoon_reserved_mb) { > - reserve_pages = totalram_pages / 10; > + reserve_pages = atomic_long_read(&totalram_pages) / 10; > selfballoon_reserved_mb = PAGES2MB(reserve_pages); > } > schedule_delayed_work(&selfballoon_worker, selfballoon_interval * HZ); > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index 582e28f..92f56d3 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -807,7 +807,8 @@ static inline int default_congestion_kb(void) > * This allows larger machines to have larger/more transfers. > * Limit the default to 256M > */ > - congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); > + congestion_kb = (16*int_sqrt(atomic_long_read(&totalram_pages))) << > + (PAGE_SHIFT-10); > if (congestion_kb > 256*1024) > congestion_kb = 256*1024; > > diff --git a/fs/file_table.c b/fs/file_table.c > index e03c8d1..5dde5c3 100644 > --- a/fs/file_table.c > +++ b/fs/file_table.c > @@ -383,10 +383,13 @@ void __init files_init(void) > void __init files_maxfiles_init(void) > { > unsigned long n; > - unsigned long memreserve = (totalram_pages - nr_free_pages()) * 3/2; > + unsigned long memreserve = (atomic_long_read(&totalram_pages) - > + nr_free_pages()) * 3/2; > > - memreserve = min(memreserve, totalram_pages - 1); > - n = ((totalram_pages - memreserve) * (PAGE_SIZE / 1024)) / 10; > + memreserve = min(memreserve, > + (unsigned long)atomic_long_read(&totalram_pages) - 1); > + n = ((atomic_long_read(&totalram_pages) - memreserve) * > + (PAGE_SIZE / 1024)) / 10; > > files_stat.max_files = max_t(unsigned long, n, NR_FILE); > } > diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c > index 4727ef6..acdbaf7 100644 > --- a/fs/fuse/inode.c > +++ b/fs/fuse/inode.c > @@ -825,8 +825,8 @@ static struct dentry *fuse_get_parent(struct dentry > *child) > static void sanitize_global_limit(unsigned *limit) > { > if (*limit == 0) > - *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / > - sizeof(struct fuse_req); > + *limit = ((atomic_long_read(&totalram_pages) > + << PAGE_SHIFT) >> 13) / sizeof(struct fuse_req); > > if (*limit >= 1 << 16) > *limit = (1 << 16) - 1; > diff --git a/fs/nfs/write.c b/fs/nfs/write.c > index 586726a..e3663b7 100644 > --- a/fs/nfs/write.c > +++ b/fs/nfs/write.c > @@ -2121,7 +2121,8 @@ int __init nfs_init_writepagecache(void) > * This allows larger machines to have larger/more transfers. > * Limit the default to 256M > */ > - nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); > + nfs_congestion_kb = (16*int_sqrt(atomic_long_read(&totalram_pages))) << > + (PAGE_SHIFT-10); > if (nfs_congestion_kb > 256*1024) > nfs_congestion_kb = 256*1024; > > diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c > index e2fe0e9..e877558 100644 > --- a/fs/nfsd/nfscache.c > +++ b/fs/nfsd/nfscache.c > @@ -99,7 +99,8 @@ static unsigned long nfsd_reply_cache_scan(struct shrinker > *shrink, > nfsd_cache_size_limit(void) > { > unsigned int limit; > - unsigned long low_pages = totalram_pages - totalhigh_pages; > + unsigned long low_pages = atomic_long_read(&totalram_pages) - > + atomic_long_read(&totalhigh_pages); > > limit = (16 * int_sqrt(low_pages)) << (PAGE_SHIFT-10); > return min_t(unsigned int, limit, 256*1024); > diff --git a/fs/ntfs/malloc.h b/fs/ntfs/malloc.h > index ab172e5..4ae6bbe 100644 > --- a/fs/ntfs/malloc.h > +++ b/fs/ntfs/malloc.h > @@ -47,7 +47,7 @@ static inline void *__ntfs_malloc(unsigned long size, gfp_t > gfp_mask) > return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM); > /* return (void *)__get_free_page(gfp_mask); */ > } > - if (likely((size >> PAGE_SHIFT) < totalram_pages)) > + if (likely((size >> PAGE_SHIFT) < atomic_long_read(&totalram_pages))) > return __vmalloc(size, gfp_mask, PAGE_KERNEL); > return NULL; > } > diff --git a/fs/proc/base.c b/fs/proc/base.c > index ce34654..9ef26dc 100644 > --- a/fs/proc/base.c > +++ b/fs/proc/base.c > @@ -530,7 +530,8 @@ static ssize_t lstats_write(struct file *file, const char > __user *buf, > static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, > struct pid *pid, struct task_struct *task) > { > - unsigned long totalpages = totalram_pages + total_swap_pages; > + unsigned long totalpages = atomic_long_read(&totalram_pages) + > + total_swap_pages; > unsigned long points = 0; > > points = oom_badness(task, NULL, NULL, totalpages) * > diff --git a/include/linux/highmem.h b/include/linux/highmem.h > index 0690679..84edaa2 100644 > --- a/include/linux/highmem.h > +++ b/include/linux/highmem.h > @@ -36,7 +36,7 @@ static inline void invalidate_kernel_vmap_range(void > *vaddr, int size) > > /* declarations for linux/mm/highmem.c */ > unsigned int nr_free_highpages(void); > -extern unsigned long totalhigh_pages; > +extern atomic_long_t totalhigh_pages; > > void kmap_flush_unused(void); > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index fcf9cc9..af952fc 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -48,7 +48,7 @@ static inline void set_max_mapnr(unsigned long limit) > static inline void set_max_mapnr(unsigned long limit) { } > #endif > > -extern unsigned long totalram_pages; > +extern atomic_long_t totalram_pages; > extern void * high_memory; > extern int page_cluster; > > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h > index 8555509..2639b05 100644 > --- a/include/linux/mmzone.h > +++ b/include/linux/mmzone.h > @@ -428,14 +428,8 @@ struct zone { > * Write access to present_pages at runtime should be protected by > * mem_hotplug_begin/end(). Any reader who can't tolerant drift of > * present_pages should get_online_mems() to get a stable value. > - * > - * Read access to managed_pages should be safe because it's unsigned > - * long. Write access to zone->managed_pages and totalram_pages are > - * protected by managed_page_count_lock at runtime. Idealy only > - * adjust_managed_page_count() should be used instead of directly > - * touching zone->managed_pages and totalram_pages. > */ > - unsigned long managed_pages; > + atomic_long_t managed_pages; > unsigned long spanned_pages; > unsigned long present_pages; > > @@ -814,7 +808,7 @@ static inline bool is_dev_zone(const struct zone *zone) > */ > static inline bool managed_zone(struct zone *zone) > { > - return zone->managed_pages; > + return atomic_long_read(&zone->managed_pages); > } > > /* Returns true if a zone has memory */ > diff --git a/include/linux/swap.h b/include/linux/swap.h > index d098743..b34c6e7 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -309,7 +309,7 @@ struct vma_swap_readahead { > } while (0) > > /* linux/mm/page_alloc.c */ > -extern unsigned long totalram_pages; > +extern atomic_long_t totalram_pages; > extern unsigned long totalreserve_pages; > extern unsigned long nr_free_buffer_pages(void); > extern unsigned long nr_free_pagecache_pages(void); > diff --git a/kernel/fork.c b/kernel/fork.c > index 2f78d32..b6068c5 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -744,11 +744,11 @@ static void set_max_threads(unsigned int > max_threads_suggested) > * The number of threads shall be limited such that the thread > * structures may only consume a small part of the available memory. > */ > - if (fls64(totalram_pages) + fls64(PAGE_SIZE) > 64) > + if (fls64(atomic_long_read(&totalram_pages)) + fls64(PAGE_SIZE) > 64) > threads = MAX_THREADS; > else > - threads = div64_u64((u64) totalram_pages * (u64) PAGE_SIZE, > - (u64) THREAD_SIZE * 8UL); > + threads = div64_u64((u64) atomic_long_read(&totalram_pages) * > + (u64) PAGE_SIZE, (u64) THREAD_SIZE * 8UL); > > if (threads > max_threads_suggested) > threads = max_threads_suggested; > diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c > index 86ef06d..ed85ddd 100644 > --- a/kernel/kexec_core.c > +++ b/kernel/kexec_core.c > @@ -217,13 +217,14 @@ int sanity_check_segment_list(struct kimage *image) > * wasted allocating pages, which can cause a soft lockup. > */ > for (i = 0; i < nr_segments; i++) { > - if (PAGE_COUNT(image->segment[i].memsz) > totalram_pages / 2) > + if (PAGE_COUNT(image->segment[i].memsz) > > + atomic_long_read(&totalram_pages) / 2) > return -EINVAL; > > total_pages += PAGE_COUNT(image->segment[i].memsz); > } > > - if (total_pages > totalram_pages / 2) > + if (total_pages > atomic_long_read(&totalram_pages) / 2) > return -EINVAL; > > /* > diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c > index b0308a2..142a3c76 100644 > --- a/kernel/power/snapshot.c > +++ b/kernel/power/snapshot.c > @@ -105,7 +105,7 @@ void __init hibernate_reserved_size_init(void) > > void __init hibernate_image_size_init(void) > { > - image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE; > + image_size = ((atomic_long_read(&totalram_pages) * 2) / 5) * PAGE_SIZE; > } > > /* > diff --git a/lib/show_mem.c b/lib/show_mem.c > index 0beaa1d..0701f63 100644 > --- a/lib/show_mem.c > +++ b/lib/show_mem.c > @@ -28,7 +28,8 @@ void show_mem(unsigned int filter, nodemask_t *nodemask) > continue; > > total += zone->present_pages; > - reserved += zone->present_pages - zone->managed_pages; > + reserved += zone->present_pages - > + atomic_long_read(&zone->managed_pages); > > if (is_highmem_idx(zoneid)) > highmem += zone->present_pages; > diff --git a/mm/highmem.c b/mm/highmem.c > index 59db322..93a45c0 100644 > --- a/mm/highmem.c > +++ b/mm/highmem.c > @@ -105,7 +105,7 @@ static inline wait_queue_head_t > *get_pkmap_wait_queue_head(unsigned int color) > } > #endif > > -unsigned long totalhigh_pages __read_mostly; > +atomic_long_t totalhigh_pages __read_mostly; > EXPORT_SYMBOL(totalhigh_pages); > > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index d394d18..f2f18b5 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -420,7 +420,7 @@ static int __init hugepage_init(void) > * where the extra memory used could hurt more than TLB overhead > * is likely to save. The admin can still enable it through /sys. > */ > - if (totalram_pages < (512 << (20 - PAGE_SHIFT))) { > + if (atomic_long_read(&totalram_pages) < (512 << (20 - PAGE_SHIFT))) { > transparent_hugepage_flags = 0; > return 0; > } > diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c > index b209dba..4d36aed 100644 > --- a/mm/kasan/quarantine.c > +++ b/mm/kasan/quarantine.c > @@ -236,8 +236,8 @@ void quarantine_reduce(void) > * Update quarantine size in case of hotplug. Allocate a fraction of > * the installed memory to quarantine minus per-cpu queue limits. > */ > - total_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) / > - QUARANTINE_FRACTION; > + total_size = (READ_ONCE(atomic_long_read(&totalram_pages)) << > + PAGE_SHIFT) / QUARANTINE_FRACTION; > percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus(); > new_quarantine_size = (total_size < percpu_quarantines) ? > 0 : total_size - percpu_quarantines; > diff --git a/mm/memblock.c b/mm/memblock.c > index eddcac2..43f53e9 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -1627,7 +1627,7 @@ void __init __memblock_free_late(phys_addr_t base, > phys_addr_t size) > > for (; cursor < end; cursor++) { > memblock_free_pages(pfn_to_page(cursor), cursor, 0); > - totalram_pages++; > + atomic_long_inc(&totalram_pages); > } > } > > @@ -2001,7 +2001,7 @@ void reset_node_managed_pages(pg_data_t *pgdat) > struct zone *z; > > for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) > - z->managed_pages = 0; > + atomic_long_set(&z->managed_pages, 0); > } > > void __init reset_all_zones_managed_pages(void) > @@ -2029,7 +2029,7 @@ unsigned long __init memblock_free_all(void) > reset_all_zones_managed_pages(); > > pages = free_low_memory_core_early(); > - totalram_pages += pages; > + atomic_long_add(pages, &totalram_pages); > > return pages; > } > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index dbbb945..0725984 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -657,10 +657,10 @@ void __online_page_free(struct page *page) > static int generic_online_page(struct page *page, unsigned int order) > { > __free_pages_core(page, order); > - totalram_pages += (1UL << order); > + atomic_long_add((1UL << order), &totalram_pages); > #ifdef CONFIG_HIGHMEM > if (PageHighMem(page)) > - totalhigh_pages += (1UL << order); > + atomic_long_add((1UL << order), &totalhigh_pages); > #endif > return 0; > } > diff --git a/mm/mm_init.c b/mm/mm_init.c > index 6838a53..93a6611 100644 > --- a/mm/mm_init.c > +++ b/mm/mm_init.c > @@ -146,7 +146,8 @@ static void __meminit mm_compute_batch(void) > s32 batch = max_t(s32, nr*2, 32); > > /* batch size set to 0.4% of (total memory/#cpus), or max int32 */ > - memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff); > + memsized_batch = min_t(u64, (atomic_long_read(&totalram_pages)/nr)/256, > + 0x7fffffff); > > vm_committed_as_batch = max_t(s32, memsized_batch, batch); > } > diff --git a/mm/oom_kill.c b/mm/oom_kill.c > index 6589f60..1a37d68 100644 > --- a/mm/oom_kill.c > +++ b/mm/oom_kill.c > @@ -269,7 +269,7 @@ static enum oom_constraint constrained_alloc(struct > oom_control *oc) > } > > /* Default to all available memory */ > - oc->totalpages = totalram_pages + total_swap_pages; > + oc->totalpages = atomic_long_read(&totalram_pages) + total_swap_pages; > > if (!IS_ENABLED(CONFIG_NUMA)) > return CONSTRAINT_NONE; > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 4bd858d..c7b26e3 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -121,10 +121,7 @@ > }; > EXPORT_SYMBOL(node_states); > > -/* Protect totalram_pages and zone->managed_pages */ > -static DEFINE_SPINLOCK(managed_page_count_lock); > - > -unsigned long totalram_pages __read_mostly; > +atomic_long_t totalram_pages __read_mostly; > unsigned long totalreserve_pages __read_mostly; > unsigned long totalcma_pages __read_mostly; > > @@ -1275,7 +1272,7 @@ void __free_pages_core(struct page *page, unsigned int > order) > set_page_count(p, 0); > } > > - page_zone(page)->managed_pages += nr_pages; > + atomic_long_add(nr_pages, &page_zone(page)->managed_pages); > set_page_refcounted(page); > __free_pages(page, order); > } > @@ -2254,7 +2251,8 @@ static void reserve_highatomic_pageblock(struct page > *page, struct zone *zone, > * Limit the number reserved to 1 pageblock or roughly 1% of a zone. > * Check is race-prone but harmless. > */ > - max_managed = (zone->managed_pages / 100) + pageblock_nr_pages; > + max_managed = (atomic_long_read(&zone->managed_pages) / 100) + > + pageblock_nr_pages; > if (zone->nr_reserved_highatomic >= max_managed) > return; > > @@ -4658,7 +4656,7 @@ static unsigned long nr_free_zone_pages(int offset) > struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); > > for_each_zone_zonelist(zone, z, zonelist, offset) { > - unsigned long size = zone->managed_pages; > + unsigned long size = atomic_long_read(&zone->managed_pages); > unsigned long high = high_wmark_pages(zone); > if (size > high) > sum += size - high; > @@ -4744,11 +4742,15 @@ long si_mem_available(void) > > void si_meminfo(struct sysinfo *val) > { > - val->totalram = totalram_pages; > + val->totalram = atomic_long_read(&totalram_pages); > val->sharedram = global_node_page_state(NR_SHMEM); > val->freeram = global_zone_page_state(NR_FREE_PAGES); > val->bufferram = nr_blockdev_pages(); > - val->totalhigh = totalhigh_pages; > +#ifdef CONFIG_HIGHMEM > + val->totalhigh = atomic_long_read(&totalhigh_pages); > +#else > + val->totalhigh = 0; > +#endif > val->freehigh = nr_free_highpages(); > val->mem_unit = PAGE_SIZE; > } > @@ -4765,7 +4767,7 @@ void si_meminfo_node(struct sysinfo *val, int nid) > pg_data_t *pgdat = NODE_DATA(nid); > > for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) > - managed_pages += pgdat->node_zones[zone_type].managed_pages; > + managed_pages += > atomic_long_read(&pgdat->node_zones[zone_type].managed_pages); > val->totalram = managed_pages; > val->sharedram = node_page_state(pgdat, NR_SHMEM); > val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); > @@ -4774,7 +4776,7 @@ void si_meminfo_node(struct sysinfo *val, int nid) > struct zone *zone = &pgdat->node_zones[zone_type]; > > if (is_highmem(zone)) { > - managed_highpages += zone->managed_pages; > + managed_highpages += > atomic_long_read(&zone->managed_pages); > free_highpages += zone_page_state(zone, NR_FREE_PAGES); > } > } > @@ -4981,7 +4983,7 @@ void show_free_areas(unsigned int filter, nodemask_t > *nodemask) > K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)), > K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)), > K(zone->present_pages), > - K(zone->managed_pages), > + K(atomic_long_read(&zone->managed_pages)), > K(zone_page_state(zone, NR_MLOCK)), > zone_page_state(zone, NR_KERNEL_STACK_KB), > K(zone_page_state(zone, NR_PAGETABLE)), > @@ -5643,7 +5645,7 @@ static int zone_batchsize(struct zone *zone) > * The per-cpu-pages pools are set to around 1000th of the > * size of the zone. > */ > - batch = zone->managed_pages / 1024; > + batch = atomic_long_read(&zone->managed_pages) / 1024; > /* But no more than a meg. */ > if (batch * PAGE_SIZE > 1024 * 1024) > batch = (1024 * 1024) / PAGE_SIZE; > @@ -5754,7 +5756,7 @@ static void pageset_set_high_and_batch(struct zone > *zone, > { > if (percpu_pagelist_fraction) > pageset_set_high(pcp, > - (zone->managed_pages / > + (atomic_long_read(&zone->managed_pages) / > percpu_pagelist_fraction)); > else > pageset_set_batch(pcp, zone_batchsize(zone)); > @@ -6309,7 +6311,7 @@ static void __meminit pgdat_init_internals(struct > pglist_data *pgdat) > static void __meminit zone_init_internals(struct zone *zone, enum zone_type > idx, int nid, > unsigned long > remaining_pages) > { > - zone->managed_pages = remaining_pages; > + atomic_long_set(&zone->managed_pages, remaining_pages); > zone_set_nid(zone, nid); > zone->name = zone_names[idx]; > zone->zone_pgdat = NODE_DATA(nid); > @@ -7061,14 +7063,12 @@ static int __init cmdline_parse_movablecore(char *p) > > void adjust_managed_page_count(struct page *page, long count) > { > - spin_lock(&managed_page_count_lock); > - page_zone(page)->managed_pages += count; > - totalram_pages += count; > + atomic_long_add(count, &page_zone(page)->managed_pages); > + atomic_long_add(count, &totalram_pages); > #ifdef CONFIG_HIGHMEM > if (PageHighMem(page)) > - totalhigh_pages += count; > + atomic_long_add(count, &totalhigh_pages); > #endif > - spin_unlock(&managed_page_count_lock); > } > EXPORT_SYMBOL(adjust_managed_page_count); > > @@ -7109,9 +7109,9 @@ unsigned long free_reserved_area(void *start, void > *end, int poison, char *s) > void free_highmem_page(struct page *page) > { > __free_reserved_page(page); > - totalram_pages++; > - page_zone(page)->managed_pages++; > - totalhigh_pages++; > + atomic_long_inc(&totalram_pages); > + atomic_long_inc(&page_zone(page)->managed_pages); > + atomic_long_inc(&totalhigh_pages); > } > #endif > > @@ -7160,10 +7160,10 @@ void __init mem_init_print_info(const char *str) > physpages << (PAGE_SHIFT - 10), > codesize >> 10, datasize >> 10, rosize >> 10, > (init_data_size + init_code_size) >> 10, bss_size >> 10, > - (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - > 10), > + (physpages - atomic_long_read(&totalram_pages) - > totalcma_pages) << (PAGE_SHIFT - 10), > totalcma_pages << (PAGE_SHIFT - 10), > #ifdef CONFIG_HIGHMEM > - totalhigh_pages << (PAGE_SHIFT - 10), > + atomic_long_read(&totalhigh_pages) << (PAGE_SHIFT - 10), > #endif > str ? ", " : "", str ? str : ""); > } > @@ -7253,8 +7253,8 @@ static void calculate_totalreserve_pages(void) > /* we treat the high watermark as reserved pages. */ > max += high_wmark_pages(zone); > > - if (max > zone->managed_pages) > - max = zone->managed_pages; > + if (max > atomic_long_read(&zone->managed_pages)) > + max = atomic_long_read(&zone->managed_pages); > > pgdat->totalreserve_pages += max; > > @@ -7278,7 +7278,7 @@ static void setup_per_zone_lowmem_reserve(void) > for_each_online_pgdat(pgdat) { > for (j = 0; j < MAX_NR_ZONES; j++) { > struct zone *zone = pgdat->node_zones + j; > - unsigned long managed_pages = zone->managed_pages; > + unsigned long managed_pages = > atomic_long_read(&zone->managed_pages); > > zone->lowmem_reserve[j] = 0; > > @@ -7296,7 +7296,7 @@ static void setup_per_zone_lowmem_reserve(void) > lower_zone->lowmem_reserve[j] = > managed_pages / > sysctl_lowmem_reserve_ratio[idx]; > } > - managed_pages += lower_zone->managed_pages; > + managed_pages += > atomic_long_read(&lower_zone->managed_pages); > } > } > } > @@ -7315,14 +7315,14 @@ static void __setup_per_zone_wmarks(void) > /* Calculate total number of !ZONE_HIGHMEM pages */ > for_each_zone(zone) { > if (!is_highmem(zone)) > - lowmem_pages += zone->managed_pages; > + lowmem_pages += atomic_long_read(&zone->managed_pages); > } > > for_each_zone(zone) { > u64 tmp; > > spin_lock_irqsave(&zone->lock, flags); > - tmp = (u64)pages_min * zone->managed_pages; > + tmp = (u64)pages_min * atomic_long_read(&zone->managed_pages); > do_div(tmp, lowmem_pages); > if (is_highmem(zone)) { > /* > @@ -7336,7 +7336,8 @@ static void __setup_per_zone_wmarks(void) > */ > unsigned long min_pages; > > - min_pages = zone->managed_pages / 1024; > + min_pages = atomic_long_read(&zone->managed_pages) / > + 1024; > min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); > zone->watermark[WMARK_MIN] = min_pages; > } else { > @@ -7353,7 +7354,7 @@ static void __setup_per_zone_wmarks(void) > * ensure a minimum size on small systems. > */ > tmp = max_t(u64, tmp >> 2, > - mult_frac(zone->managed_pages, > + mult_frac(atomic_long_read(&zone->managed_pages), > watermark_scale_factor, 10000)); > > zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; > @@ -7483,7 +7484,8 @@ static void setup_min_unmapped_ratio(void) > pgdat->min_unmapped_pages = 0; > > for_each_zone(zone) > - zone->zone_pgdat->min_unmapped_pages += (zone->managed_pages * > + zone->zone_pgdat->min_unmapped_pages += > + (atomic_long_read(&zone->managed_pages) * > sysctl_min_unmapped_ratio) / 100; > } > > @@ -7511,8 +7513,9 @@ static void setup_min_slab_ratio(void) > pgdat->min_slab_pages = 0; > > for_each_zone(zone) > - zone->zone_pgdat->min_slab_pages += (zone->managed_pages * > - sysctl_min_slab_ratio) / 100; > + zone->zone_pgdat->min_slab_pages += > + (atomic_long_read(&zone->managed_pages) * > + sysctl_min_slab_ratio) / 100; > } > > int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *table, int write, > diff --git a/mm/shmem.c b/mm/shmem.c > index a6964ba..edd55db 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -109,12 +109,18 @@ struct shmem_falloc { > #ifdef CONFIG_TMPFS > static unsigned long shmem_default_max_blocks(void) > { > - return totalram_pages / 2; > + return atomic_long_read(&totalram_pages) / 2; > } > > static unsigned long shmem_default_max_inodes(void) > { > - return min(totalram_pages - totalhigh_pages, totalram_pages / 2); > + return min((unsigned long)atomic_long_read(&totalram_pages) - > +#ifdef CONFIG_HIGHMEM > + (unsigned long) atomic_long_read(&totalhigh_pages), > +#else > + 0, > +#endif > + (unsigned long)atomic_long_read(&totalram_pages) / 2); > } > #endif > > @@ -3274,7 +3280,7 @@ static int shmem_parse_options(char *options, struct > shmem_sb_info *sbinfo, > size = memparse(value,&rest); > if (*rest == '%') { > size <<= PAGE_SHIFT; > - size *= totalram_pages; > + size *= atomic_long_read(&totalram_pages); > do_div(size, 100); > rest++; > } > diff --git a/mm/slab.c b/mm/slab.c > index 2a5654b..70252b0 100644 > --- a/mm/slab.c > +++ b/mm/slab.c > @@ -1248,7 +1248,8 @@ void __init kmem_cache_init(void) > * page orders on machines with more than 32MB of memory if > * not overridden on the command line. > */ > - if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT) > + if (!slab_max_order_set && atomic_long_read(&totalram_pages) > > + (32 << 20) >> PAGE_SHIFT) > slab_max_order = SLAB_MAX_ORDER_HI; > > /* Bootstrap is tricky, because several objects are allocated > diff --git a/mm/swap.c b/mm/swap.c > index aa48371..e85bc4a 100644 > --- a/mm/swap.c > +++ b/mm/swap.c > @@ -1023,7 +1023,8 @@ unsigned pagevec_lookup_range_nr_tag(struct pagevec > *pvec, > */ > void __init swap_setup(void) > { > - unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); > + unsigned long megs = atomic_long_read(&totalram_pages) >> > + (20 - PAGE_SHIFT); > > /* Use a smaller cluster for small-memory machines */ > if (megs < 16) > diff --git a/mm/util.c b/mm/util.c > index 7f1f165..a3ae8ee 100644 > --- a/mm/util.c > +++ b/mm/util.c > @@ -600,7 +600,7 @@ unsigned long vm_commit_limit(void) > if (sysctl_overcommit_kbytes) > allowed = sysctl_overcommit_kbytes >> (PAGE_SHIFT - 10); > else > - allowed = ((totalram_pages - hugetlb_total_pages()) > + allowed = ((atomic_long_read(&totalram_pages) - > hugetlb_total_pages()) > * sysctl_overcommit_ratio / 100); > allowed += total_swap_pages; > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index 97d4b25..f177af8 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -1634,7 +1634,7 @@ void *vmap(struct page **pages, unsigned int count, > > might_sleep(); > > - if (count > totalram_pages) > + if (count > atomic_long_read(&totalram_pages)) > return NULL; > > size = (unsigned long)count << PAGE_SHIFT; > @@ -1739,7 +1739,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned > long align, > unsigned long real_size = size; > > size = PAGE_ALIGN(size); > - if (!size || (size >> PAGE_SHIFT) > totalram_pages) > + if (!size || (size >> PAGE_SHIFT) > atomic_long_read(&totalram_pages)) > goto fail; > > area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED | > diff --git a/mm/vmstat.c b/mm/vmstat.c > index 6038ce5..20551e8 100644 > --- a/mm/vmstat.c > +++ b/mm/vmstat.c > @@ -227,7 +227,7 @@ int calculate_normal_threshold(struct zone *zone) > * 125 1024 10 16-32 GB 9 > */ > > - mem = zone->managed_pages >> (27 - PAGE_SHIFT); > + mem = atomic_long_read(&zone->managed_pages) >> (27 - PAGE_SHIFT); > > threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem)); > > @@ -1569,7 +1569,7 @@ static void zoneinfo_show_print(struct seq_file *m, > pg_data_t *pgdat, > high_wmark_pages(zone), > zone->spanned_pages, > zone->present_pages, > - zone->managed_pages); > + atomic_long_read(&zone->managed_pages)); > > seq_printf(m, > "\n protection: (%ld", > diff --git a/mm/workingset.c b/mm/workingset.c > index b15799d..dcd4e16 100644 > --- a/mm/workingset.c > +++ b/mm/workingset.c > @@ -550,7 +550,7 @@ static int __init workingset_init(void) > * double the initial memory by using totalram_pages as-is. > */ > timestamp_bits = BITS_PER_LONG - EVICTION_SHIFT; > - max_order = fls_long(totalram_pages - 1); > + max_order = fls_long(atomic_long_read(&totalram_pages) - 1); > if (max_order > timestamp_bits) > bucket_order = max_order - timestamp_bits; > pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n", > diff --git a/mm/zswap.c b/mm/zswap.c > index cd91fd9..5d2d7b9 100644 > --- a/mm/zswap.c > +++ b/mm/zswap.c > @@ -219,7 +219,7 @@ struct zswap_tree { > > static bool zswap_is_full(void) > { > - return totalram_pages * zswap_max_pool_percent / 100 < > + return atomic_long_read(&totalram_pages) * zswap_max_pool_percent / 100 > < > DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE); > } > > diff --git a/net/dccp/proto.c b/net/dccp/proto.c > index 875858c..4a92d11 100644 > --- a/net/dccp/proto.c > +++ b/net/dccp/proto.c > @@ -1154,10 +1154,10 @@ static int __init dccp_init(void) > * > * The methodology is similar to that of the buffer cache. > */ > - if (totalram_pages >= (128 * 1024)) > - goal = totalram_pages >> (21 - PAGE_SHIFT); > + if (atomic_long_read(&totalram_pages) >= (128 * 1024)) > + goal = atomic_long_read(&totalram_pages) >> (21 - PAGE_SHIFT); > else > - goal = totalram_pages >> (23 - PAGE_SHIFT); > + goal = atomic_long_read(&totalram_pages) >> (23 - PAGE_SHIFT); > > if (thash_entries) > goal = (thash_entries * > diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c > index 1c002c0..bb49b0f 100644 > --- a/net/decnet/dn_route.c > +++ b/net/decnet/dn_route.c > @@ -1866,7 +1866,7 @@ void __init dn_route_init(void) > dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; > add_timer(&dn_route_timer); > > - goal = totalram_pages >> (26 - PAGE_SHIFT); > + goal = atomic_long_read(&totalram_pages) >> (26 - PAGE_SHIFT); > > for(order = 0; (1UL << order) < goal; order++) > /* NOTHING */; > diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c > index 03b51cd..d91bdab 100644 > --- a/net/ipv4/tcp_metrics.c > +++ b/net/ipv4/tcp_metrics.c > @@ -1000,7 +1000,7 @@ static int __net_init tcp_net_metrics_init(struct net > *net) > > slots = tcpmhash_entries; > if (!slots) { > - if (totalram_pages >= 128 * 1024) > + if (atomic_long_read(&totalram_pages) >= 128 * 1024) > slots = 16 * 1024; > else > slots = 8 * 1024; > diff --git a/net/netfilter/nf_conntrack_core.c > b/net/netfilter/nf_conntrack_core.c > index ca1168d..3285df9 100644 > --- a/net/netfilter/nf_conntrack_core.c > +++ b/net/netfilter/nf_conntrack_core.c > @@ -2267,11 +2267,11 @@ int nf_conntrack_init_start(void) > * >= 4GB machines have 65536 buckets. > */ > nf_conntrack_htable_size > - = (((totalram_pages << PAGE_SHIFT) / 16384) > + = (((atomic_long_read(&totalram_pages) << PAGE_SHIFT) / > 16384) > / sizeof(struct hlist_head)); > - if (totalram_pages > (4 * (1024 * 1024 * 1024 / PAGE_SIZE))) > + if (atomic_long_read(&totalram_pages) > (4 * (1024 * 1024 * > 1024 / PAGE_SIZE))) > nf_conntrack_htable_size = 65536; > - else if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) > + else if (atomic_long_read(&totalram_pages) > (1024 * 1024 * > 1024 / PAGE_SIZE)) > nf_conntrack_htable_size = 16384; > if (nf_conntrack_htable_size < 32) > nf_conntrack_htable_size = 32; > diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c > index 3e7d259..3c79a0f 100644 > --- a/net/netfilter/xt_hashlimit.c > +++ b/net/netfilter/xt_hashlimit.c > @@ -279,9 +279,9 @@ static int htable_create(struct net *net, struct > hashlimit_cfg3 *cfg, > if (cfg->size) { > size = cfg->size; > } else { > - size = (totalram_pages << PAGE_SHIFT) / 16384 / > + size = (atomic_long_read(&totalram_pages) << PAGE_SHIFT) / > 16384 / > sizeof(struct hlist_head); > - if (totalram_pages > 1024 * 1024 * 1024 / PAGE_SIZE) > + if (atomic_long_read(&totalram_pages) > 1024 * 1024 * 1024 / > PAGE_SIZE) > size = 8192; > if (size < 16) > size = 16; > diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c > index 9b277bd..4ca4def 100644 > --- a/net/sctp/protocol.c > +++ b/net/sctp/protocol.c > @@ -1426,10 +1426,10 @@ static __init int sctp_init(void) > * The methodology is similar to that of the tcp hash tables. > * Though not identical. Start by getting a goal size > */ > - if (totalram_pages >= (128 * 1024)) > - goal = totalram_pages >> (22 - PAGE_SHIFT); > + if (atomic_long_read(&totalram_pages) >= (128 * 1024)) > + goal = atomic_long_read(&totalram_pages) >> (22 - PAGE_SHIFT); > else > - goal = totalram_pages >> (24 - PAGE_SHIFT); > + goal = atomic_long_read(&totalram_pages) >> (24 - PAGE_SHIFT); > > /* Then compute the page order for said goal */ > order = get_order(goal); > diff --git a/security/integrity/ima/ima_kexec.c > b/security/integrity/ima/ima_kexec.c > index 16bd187..8bb32ad 100644 > --- a/security/integrity/ima/ima_kexec.c > +++ b/security/integrity/ima/ima_kexec.c > @@ -106,7 +106,7 @@ void ima_add_kexec_buffer(struct kimage *image) > kexec_segment_size = ALIGN(ima_get_binary_runtime_size() + > PAGE_SIZE / 2, PAGE_SIZE); > if ((kexec_segment_size == ULONG_MAX) || > - ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages / 2)) { > + ((kexec_segment_size >> PAGE_SHIFT) > > atomic_long_read(&totalram_pages) / 2)) { > pr_err("Binary measurement list too large.\n"); > return; > } _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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