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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [Patch] support of lock profiling in Xen
Hi, attached is a patch to support lock profiling in the Xen hypervisor. The feature is switchable at compile time (like software performance counters) in Rules.mk. If lock profiling is not activated, code and data structures are the same as without the patch. With activated lock profiling some statistical data is added to each spinlock_t structure and locking/unlocking keeps track for each lock of: - number of successful locks - cumulated time of lock held - number of locking calls leading to wait cycles - cumulated waiting time The profile data may be obtained either via hotkey from the console or with the new tool xenlockprof. To be able to find all locks for printing out the profile data, a linked list with the locks is built up. Locks defined via DEFINE_SPINLOCK are added to this list automatically, locks in dynamically allocated data structures have to be added (and removed) explicitly to the queue to be able to print the profile data. Adding is done via spin_lock_init_prof (there are two additional calls with one or two index parameters to be able to distinguish locks e.g. per domid and vcpu-nr), removing is done via spin_lock_destroy_prof (may be called for a completely zeroed structure as well). I'm not completely satisfied with the solution for the dynamically initialized locks, but I had no better idea in the first run. Another enhancement would be to expand the profiling to rw-locks as well, but this would have required a rewrite of the lock routines using try_lock like for spinlocks. I could do this if the lock profiling is accepted. Comments welcome :-) Juergen -- Juergen Gross Principal Developer Operating Systems TSP ES&S SWE OS6 Telephone: +49 (0) 89 636 47950 Fujitsu Technolgy Solutions e-mail: juergen.gross@xxxxxxxxxxxxxx Otto-Hahn-Ring 6 Internet: ts.fujitsu.com D-81739 Muenchen Company details: ts.fujitsu.com/imprint.html Support of lock profiling in Xen
Signed-off-by: juergen.gross@xxxxxxxxxxxxxx
diff -r 729567f615c1 tools/libxc/xc_misc.c
--- a/tools/libxc/xc_misc.c Wed Oct 07 16:29:03 2009 +0100
+++ b/tools/libxc/xc_misc.c Thu Oct 08 09:18:52 2009 +0200
@@ -121,6 +121,30 @@
return rc;
}
+int xc_lockprof_control(int xc_handle,
+ uint32_t opcode,
+ uint32_t *n_elems,
+ uint64_t *time,
+ xc_lockprof_data_t *data)
+{
+ int rc;
+ DECLARE_SYSCTL;
+
+ sysctl.cmd = XEN_SYSCTL_lockprof_op;
+ sysctl.u.lockprof_op.cmd = opcode;
+ sysctl.u.lockprof_op.max_elem = n_elems ? *n_elems : 0;
+ set_xen_guest_handle(sysctl.u.lockprof_op.data, data);
+
+ rc = do_sysctl(xc_handle, &sysctl);
+
+ if (n_elems)
+ *n_elems = sysctl.u.lockprof_op.nr_elem;
+ if (time)
+ *time = sysctl.u.lockprof_op.time;
+
+ return rc;
+}
+
int xc_getcpuinfo(int xc_handle, int max_cpus,
xc_cpuinfo_t *info, int *nr_cpus)
{
diff -r 729567f615c1 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Wed Oct 07 16:29:03 2009 +0100
+++ b/tools/libxc/xenctrl.h Thu Oct 08 09:18:52 2009 +0200
@@ -700,6 +700,14 @@
int *nbr_desc,
int *nbr_val);
+typedef xen_sysctl_lockprof_data_t xc_lockprof_data_t;
+/* IMPORTANT: The caller is responsible for mlock()'ing the @data array. */
+int xc_lockprof_control(int xc_handle,
+ uint32_t opcode,
+ uint32_t *n_elems,
+ uint64_t *time,
+ xc_lockprof_data_t *data);
+
/**
* Memory maps a range within one domain to a local address range. Mappings
* should be unmapped with munmap and should follow the same rules as mmap
diff -r 729567f615c1 tools/misc/Makefile
--- a/tools/misc/Makefile Wed Oct 07 16:29:03 2009 +0100
+++ b/tools/misc/Makefile Thu Oct 08 09:18:52 2009 +0200
@@ -10,7 +10,7 @@
HDRS = $(wildcard *.h)
-TARGETS-y := xenperf xenpm xen-tmem-list-parse gtraceview gtracestat
+TARGETS-y := xenperf xenpm xen-tmem-list-parse gtraceview gtracestat
xenlockprof
TARGETS-$(CONFIG_X86) += xen-detect xen-hvmctx
TARGETS := $(TARGETS-y)
@@ -22,7 +22,7 @@
INSTALL_BIN-$(CONFIG_X86) += xen-detect
INSTALL_BIN := $(INSTALL_BIN-y)
-INSTALL_SBIN-y := xm xen-bugtool xen-python-path xend xenperf xsview xenpm
xen-tmem-list-parse gtraceview gtracestat
+INSTALL_SBIN-y := xm xen-bugtool xen-python-path xend xenperf xsview xenpm
xen-tmem-list-parse gtraceview gtracestat xenlockprof
INSTALL_SBIN-$(CONFIG_X86) += xen-hvmctx
INSTALL_SBIN := $(INSTALL_SBIN-y)
@@ -49,7 +49,7 @@
%.o: %.c $(HDRS) Makefile
$(CC) -c $(CFLAGS) -o $@ $<
-xen-hvmctx xenperf xenpm gtracestat: %: %.o Makefile
+xen-hvmctx xenperf xenpm gtracestat xenlockprof: %: %.o Makefile
$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) $(LDFLAGS_libxenctrl)
gtraceview: %: %.o Makefile
diff -r 729567f615c1 tools/misc/xenlockprof.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/misc/xenlockprof.c Thu Oct 08 09:18:52 2009 +0200
@@ -0,0 +1,129 @@
+/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
+ ****************************************************************************
+ * (C) 2009 - Juergen Gross - Fujitsu Technology Solutions
+ ****************************************************************************
+ *
+ * File: xenlockprof.c
+ * Author: Juergen Gross (juergen.gross@xxxxxxxxxxxxxx)
+ * Date: Oct 2009
+ *
+ * Description:
+ */
+
+#include <xenctrl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <string.h>
+
+static int lock_pages(void *addr, size_t len)
+{
+ int e = 0;
+#ifndef __sun__
+ e = mlock(addr, len);
+#endif
+ return (e);
+}
+
+static void unlock_pages(void *addr, size_t len)
+{
+#ifndef __sun__
+ munlock(addr, len);
+#endif
+}
+
+int main(int argc, char *argv[])
+{
+ int xc_handle;
+ uint32_t i, j, n;
+ uint64_t time;
+ double l, b, sl, sb;
+ char name[60];
+ xc_lockprof_data_t *data;
+
+ if ((argc > 2) || ((argc == 2) && (strcmp(argv[1], "-r") != 0)))
+ {
+ printf("%s: [-r]\n", argv[0]);
+ printf("no args: print lock profile data\n");
+ printf(" -r : reset profile data\n");
+ return 1;
+ }
+
+ if ((xc_handle = xc_interface_open()) == -1)
+ {
+ fprintf(stderr, "Error opening xc interface: %d (%s)\n",
+ errno, strerror(errno));
+ return 1;
+ }
+
+ if (argc > 1)
+ {
+ if (xc_lockprof_control(xc_handle, XEN_SYSCTL_LOCKPROF_reset, NULL,
+ NULL, NULL) != 0)
+ {
+ fprintf(stderr, "Error reseting profile data: %d (%s)\n",
+ errno, strerror(errno));
+ return 1;
+ }
+ return 1;
+ }
+
+ n = 0;
+ if (xc_lockprof_control(xc_handle, XEN_SYSCTL_LOCKPROF_query, &n,
+ NULL, NULL) != 0)
+ {
+ fprintf(stderr, "Error getting number of profile records: %d (%s)\n",
+ errno, strerror(errno));
+ return 1;
+ }
+
+ n += 32; /* just to be sure */
+ data = malloc(sizeof(*data) * n);
+ if ((data == NULL) || (lock_pages(data, sizeof(*data) * n) != 0))
+ {
+ fprintf(stderr, "Could not alloc or lock buffers: %d (%s)\n",
+ errno, strerror(errno));
+ return 1;
+ }
+
+ i = n;
+ if ( xc_lockprof_control(xc_handle, XEN_SYSCTL_LOCKPROF_query, &i,
+ &time, data) != 0)
+ {
+ fprintf(stderr, "Error getting profile records: %d (%s)\n",
+ errno, strerror(errno));
+ return 1;
+ }
+
+ unlock_pages(data, sizeof(*data) * n);
+
+ if (i > n)
+ {
+ printf("data incomplete, %d records are missing!\n\n", i - n);
+ i = n;
+ }
+ sl = 0;
+ sb = 0;
+ for (j = 0; j < i; j++)
+ {
+ if (data[j].idx2 >= 0)
+ sprintf(name, data[j].name, data[j].idx1, data[j].idx2);
+ else if (data[j].idx1 >= 0)
+ sprintf(name, data[j].name, data[j].idx1);
+ else
+ sprintf(name, data[j].name);
+ l = (double)(data[j].lock_time) / 1E+09;
+ b = (double)(data[j].block_time) / 1E+09;
+ sl += l;
+ sb += b;
+ printf("%-50s: lock:%12ld(%20.9fs), block:%12ld(%20.9fs)\n",
+ name, data[j].lock_cnt, l, data[j].block_cnt, b);
+ }
+ l = (double)time / 1E+09;
+ printf("total profiling time: %20.9fs\n", l);
+ printf("total locked time: %20.9fs\n", sl);
+ printf("total blocked time: %20.9fs\n", sb);
+
+ return 0;
+}
diff -r 729567f615c1 xen/Rules.mk
--- a/xen/Rules.mk Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/Rules.mk Thu Oct 08 09:18:52 2009 +0200
@@ -6,6 +6,7 @@
verbose ?= n
perfc ?= n
perfc_arrays ?= n
+lock_profile ?= n
crash_debug ?= n
frame_pointer ?= n
@@ -49,6 +50,7 @@
CFLAGS-$(crash_debug) += -DCRASH_DEBUG
CFLAGS-$(perfc) += -DPERF_COUNTERS
CFLAGS-$(perfc_arrays) += -DPERF_ARRAYS
+CFLAGS-$(lock_profile) += -DLOCK_PROFILE
CFLAGS-$(frame_pointer) += -fno-omit-frame-pointer -DCONFIG_FRAME_POINTER
ifneq ($(max_phys_cpus),)
diff -r 729567f615c1 xen/arch/x86/xen.lds.S
--- a/xen/arch/x86/xen.lds.S Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/arch/x86/xen.lds.S Thu Oct 08 09:18:52 2009 +0200
@@ -62,6 +62,13 @@
*(.data.read_mostly)
} :text
+#ifdef LOCK_PROFILE
+ . = ALIGN(32);
+ __lock_profile_start = .;
+ .lockprofile.data : { *(.lockprofile.data) } :text
+ __lock_profile_end = .;
+#endif
+
. = ALIGN(4096); /* Init code and data */
__init_begin = .;
.init.text : {
diff -r 729567f615c1 xen/common/keyhandler.c
--- a/xen/common/keyhandler.c Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/common/keyhandler.c Thu Oct 08 09:18:52 2009 +0200
@@ -347,6 +347,20 @@
};
#endif
+#ifdef LOCK_PROFILE
+extern void spinlock_profile_printall(unsigned char key);
+static struct keyhandler spinlock_printall_keyhandler = {
+ .diagnostic = 1,
+ .u.fn = spinlock_profile_printall,
+ .desc = "print lock profile info"
+};
+extern void spinlock_profile_reset(unsigned char key);
+static struct keyhandler spinlock_reset_keyhandler = {
+ .u.fn = spinlock_profile_reset,
+ .desc = "reset lock profile info"
+};
+#endif
+
static void run_all_nonirq_keyhandlers(unsigned long unused)
{
/* Fire all the non-IRQ-context diagnostic keyhandlers */
@@ -428,6 +442,12 @@
register_keyhandler('p', &perfc_printall_keyhandler);
register_keyhandler('P', &perfc_reset_keyhandler);
#endif
+
+#ifdef LOCK_PROFILE
+ register_keyhandler('l', &spinlock_printall_keyhandler);
+ register_keyhandler('L', &spinlock_reset_keyhandler);
+#endif
+
}
/*
diff -r 729567f615c1 xen/common/spinlock.c
--- a/xen/common/spinlock.c Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/common/spinlock.c Thu Oct 08 09:18:52 2009 +0200
@@ -1,7 +1,11 @@
+#include <xen/lib.h>
#include <xen/config.h>
#include <xen/irq.h>
#include <xen/smp.h>
+#include <xen/time.h>
#include <xen/spinlock.h>
+#include <xen/guest_access.h>
+#include <public/sysctl.h>
#include <asm/processor.h>
#ifndef NDEBUG
@@ -41,56 +45,97 @@
#endif
+#ifdef LOCK_PROFILE
+
+#define LOCK_PROFILE_REL \
+ lock->profile.time_hold += NOW() - lock->profile.time_locked; \
+ lock->profile.lock_cnt++
+#define LOCK_PROFILE_VAR s_time_t block = 0
+#define LOCK_PROFILE_BLOCK block = block ? : NOW();
+#define LOCK_PROFILE_GOT \
+ lock->profile.time_locked = NOW(); \
+ if (block) \
+ { \
+ lock->profile.time_block += lock->profile.time_locked - block; \
+ lock->profile.block_cnt++; \
+ }
+
+#else
+
+#define LOCK_PROFILE_REL
+#define LOCK_PROFILE_VAR
+#define LOCK_PROFILE_BLOCK
+#define LOCK_PROFILE_GOT
+
+#endif
+
void _spin_lock(spinlock_t *lock)
{
+ LOCK_PROFILE_VAR;
+
check_lock(&lock->debug);
while ( unlikely(!_raw_spin_trylock(&lock->raw)) )
+ {
+ LOCK_PROFILE_BLOCK;
while ( likely(_raw_spin_is_locked(&lock->raw)) )
cpu_relax();
+ }
+ LOCK_PROFILE_GOT;
}
void _spin_lock_irq(spinlock_t *lock)
{
+ LOCK_PROFILE_VAR;
+
ASSERT(local_irq_is_enabled());
local_irq_disable();
check_lock(&lock->debug);
while ( unlikely(!_raw_spin_trylock(&lock->raw)) )
{
+ LOCK_PROFILE_BLOCK;
local_irq_enable();
while ( likely(_raw_spin_is_locked(&lock->raw)) )
cpu_relax();
local_irq_disable();
}
+ LOCK_PROFILE_GOT;
}
unsigned long _spin_lock_irqsave(spinlock_t *lock)
{
unsigned long flags;
+ LOCK_PROFILE_VAR;
+
local_irq_save(flags);
check_lock(&lock->debug);
while ( unlikely(!_raw_spin_trylock(&lock->raw)) )
{
+ LOCK_PROFILE_BLOCK;
local_irq_restore(flags);
while ( likely(_raw_spin_is_locked(&lock->raw)) )
cpu_relax();
local_irq_save(flags);
}
+ LOCK_PROFILE_GOT;
return flags;
}
void _spin_unlock(spinlock_t *lock)
{
+ LOCK_PROFILE_REL;
_raw_spin_unlock(&lock->raw);
}
void _spin_unlock_irq(spinlock_t *lock)
{
+ LOCK_PROFILE_REL;
_raw_spin_unlock(&lock->raw);
local_irq_enable();
}
void _spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
{
+ LOCK_PROFILE_REL;
_raw_spin_unlock(&lock->raw);
local_irq_restore(flags);
}
@@ -104,13 +149,32 @@
int _spin_trylock(spinlock_t *lock)
{
check_lock(&lock->debug);
+#ifndef LOCK_PROFILE
return _raw_spin_trylock(&lock->raw);
+#else
+ if (!_raw_spin_trylock(&lock->raw)) return 0;
+ lock->profile.time_locked = NOW();
+ return 1;
+#endif
}
void _spin_barrier(spinlock_t *lock)
{
+#ifdef LOCK_PROFILE
+ s_time_t block = NOW();
+ u64 loop = 0;
+
+ check_lock(&lock->debug);
+ do { mb(); loop++;} while ( _raw_spin_is_locked(&lock->raw) );
+ if (loop > 1)
+ {
+ lock->profile.time_block += NOW() - block;
+ lock->profile.block_cnt++;
+ }
+#else
check_lock(&lock->debug);
do { mb(); } while ( _raw_spin_is_locked(&lock->raw) );
+#endif
mb();
}
@@ -248,3 +312,139 @@
check_lock(&lock->debug);
return _raw_rw_is_write_locked(&lock->raw);
}
+
+#ifdef LOCK_PROFILE
+extern struct lock_profile *__lock_profile_start;
+extern struct lock_profile *__lock_profile_end;
+
+static s_time_t lock_profile_start = 0;
+static struct lock_profile *lock_profile_anc = NULL;
+static int lock_profile_n = 0;
+static spinlock_t lock_profile_lock = SPIN_LOCK_UNLOCKED;
+
+void spinlock_profile_printall(unsigned char key)
+{
+ s_time_t now = NOW();
+ s_time_t diff;
+ struct lock_profile *q;
+
+ diff = now - lock_profile_start;
+ printk("Xen lock profile info SHOW (now = %08X:%08X, "
+ "total = %08X:%08X)\n", (u32)(now>>32), (u32)now,
+ (u32)(diff>>32), (u32)diff);
+ spin_lock(&lock_profile_lock);
+ for (q = lock_profile_anc; q != NULL; q = q->next)
+ {
+ if (q->idx1 == -1) printk(q->name);
+ else if (q->idx2 == -1) printk(q->name, q->idx1);
+ else printk(q->name, q->idx1, q->idx2);
+ printk("\n lock:%12ld(%08X:%08X), block:%12ld(%08X:%08X)\n",
+ q->lock_cnt, (u32)(q->time_hold >> 32), (u32)q->time_hold,
+ q->block_cnt, (u32)(q->time_block >> 32), (u32)q->time_block);
+ }
+ spin_unlock(&lock_profile_lock);
+ return;
+}
+
+void spinlock_profile_reset(unsigned char key)
+{
+ s_time_t now = NOW();
+ struct lock_profile *q;
+
+ if ( key != '\0' )
+ printk("Xen lock profile info RESET (now = %08X:%08X)\n",
+ (u32)(now>>32), (u32)now);
+ lock_profile_start = now;
+ spin_lock(&lock_profile_lock);
+ for (q = lock_profile_anc; q != NULL; q = q->next)
+ {
+ q->lock_cnt =0;
+ q->block_cnt = 0;
+ q->time_hold = 0;
+ q->time_block = 0;
+ }
+ spin_unlock(&lock_profile_lock);
+ return;
+}
+
+void spinlock_profile_add(struct lock_profile *p)
+{
+ spin_lock(&lock_profile_lock);
+ lock_profile_n++;
+ p->prev = NULL;
+ if (lock_profile_anc != NULL) lock_profile_anc->prev = p;
+ p->next = lock_profile_anc;
+ lock_profile_anc = p;
+ spin_unlock(&lock_profile_lock);
+ return;
+}
+
+void spinlock_profile_rm(struct lock_profile *p)
+{
+ if (p->name == NULL) return;
+ spin_lock(&lock_profile_lock);
+ if (p->next != NULL) p->next->prev = p->prev;
+ if (p->prev != NULL) p->prev->next = p->next;
+ else lock_profile_anc = p->next;
+ lock_profile_n--;
+ spin_unlock(&lock_profile_lock);
+ return;
+}
+
+/* Dom0 control of lock profiling */
+int spinlock_profile_control(xen_sysctl_lockprof_op_t *pc)
+{
+ int rc;
+ int i;
+ struct lock_profile *q;
+ xen_sysctl_lockprof_data_t elem;
+
+ rc = 0;
+ switch (pc->cmd)
+ {
+ case XEN_SYSCTL_LOCKPROF_reset:
+ spinlock_profile_reset('\0');
+ break;
+ case XEN_SYSCTL_LOCKPROF_query:
+ spin_lock(&lock_profile_lock);
+ q = lock_profile_anc;
+ for (i = 0; i < pc->max_elem; i++)
+ {
+ if (q == NULL) break;
+ safe_strcpy(elem.name, q->name);
+ elem.idx1 = q->idx1;
+ elem.idx2 = q->idx2;
+ elem.lock_cnt = q->lock_cnt;
+ elem.block_cnt = q->block_cnt;
+ elem.lock_time = q->time_hold;
+ elem.block_time = q->time_block;
+ if (copy_to_guest_offset(pc->data, i, &elem, 1))
+ {
+ rc = -EFAULT;
+ break;
+ }
+ q = q->next;
+ }
+ pc->nr_elem = lock_profile_n;
+ pc->time = NOW() - lock_profile_start;
+ spin_unlock(&lock_profile_lock);
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+ return rc;
+}
+
+static int __init spinlock_profile_init(void)
+{
+ struct lock_profile **data;
+
+ for (data = &__lock_profile_start; data < &__lock_profile_end; data++)
+ {
+ spinlock_profile_add(*data);
+ }
+ return 0;
+}
+__initcall(spinlock_profile_init);
+#endif
diff -r 729567f615c1 xen/common/sysctl.c
--- a/xen/common/sysctl.c Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/common/sysctl.c Thu Oct 08 09:18:52 2009 +0200
@@ -29,6 +29,9 @@
extern long arch_do_sysctl(
struct xen_sysctl *op, XEN_GUEST_HANDLE(xen_sysctl_t) u_sysctl);
+#ifdef LOCK_PROFILE
+extern int spinlock_profile_control(xen_sysctl_lockprof_op_t *pc);
+#endif
long do_sysctl(XEN_GUEST_HANDLE(xen_sysctl_t) u_sysctl)
{
@@ -144,6 +147,15 @@
break;
#endif
+#ifdef LOCK_PROFILE
+ case XEN_SYSCTL_lockprof_op:
+ {
+ ret = spinlock_profile_control(&op->u.lockprof_op);
+ if ( copy_to_guest(u_sysctl, op, 1) )
+ ret = -EFAULT;
+ }
+ break;
+#endif
case XEN_SYSCTL_debug_keys:
{
char c;
diff -r 729567f615c1 xen/include/public/sysctl.h
--- a/xen/include/public/sysctl.h Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/include/public/sysctl.h Thu Oct 08 09:18:52 2009 +0200
@@ -454,6 +454,34 @@
#define PG_OFFLINE_OWNER_SHIFT 16
+#define XEN_SYSCTL_lockprof_op 11
+/* Sub-operations: */
+#define XEN_SYSCTL_LOCKPROF_reset 1 /* Reset all profile data to zero. */
+#define XEN_SYSCTL_LOCKPROF_query 2 /* Get lock profile information. */
+struct xen_sysctl_lockprof_data {
+ char name[40]; /* lock name (may include up to 2 %d specifiers) */
+ int32_t idx1; /* index 1 (e.g. domain id) or -1 */
+ int32_t idx2; /* index 2 (e.g. vcpu nr) or -1 */
+ uint64_t lock_cnt; /* # of locking succeeded */
+ uint64_t block_cnt; /* # of wait for lock */
+ uint64_t lock_time; /* nsecs lock held */
+ uint64_t block_time; /* nsecs waited for lock */
+};
+typedef struct xen_sysctl_lockprof_data xen_sysctl_lockprof_data_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_lockprof_data_t);
+struct xen_sysctl_lockprof_op {
+ /* IN variables. */
+ uint32_t cmd; /* XEN_SYSCTL_LOCKPROF_??? */
+ uint32_t max_elem; /* size of output buffer */
+ /* OUT variables (query only). */
+ uint32_t nr_elem; /* number of elements available */
+ uint64_t time; /* nsecs of profile measurement */
+ /* profile information (or NULL) */
+ XEN_GUEST_HANDLE_64(xen_sysctl_lockprof_data_t) data;
+};
+typedef struct xen_sysctl_lockprof_op xen_sysctl_lockprof_op_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_lockprof_op_t);
+
struct xen_sysctl {
uint32_t cmd;
uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
@@ -471,6 +499,7 @@
struct xen_sysctl_cpu_hotplug cpu_hotplug;
struct xen_sysctl_pm_op pm_op;
struct xen_sysctl_page_offline_op page_offline;
+ struct xen_sysctl_lockprof_op lockprof_op;
uint8_t pad[128];
} u;
};
diff -r 729567f615c1 xen/include/xen/spinlock.h
--- a/xen/include/xen/spinlock.h Wed Oct 07 16:29:03 2009 +0100
+++ b/xen/include/xen/spinlock.h Thu Oct 08 09:18:52 2009 +0200
@@ -19,17 +19,63 @@
#define spin_debug_disable() ((void)0)
#endif
+#ifdef LOCK_PROFILE
+/*
+ lock profiling on: ALL locks are subject to profiling, data is available
+ only for locks declared or inited with profiling support
+*/
+struct lock_profile {
+ struct lock_profile *next; /* forward link in profile queue */
+ struct lock_profile *prev; /* backward link in profile queue */
+ char *name; /* lock name, may contain %d for idx */
+ u64 lock_cnt; /* # of complete locking ops */
+ u64 block_cnt; /* # of complete wait for lock */
+ s64 time_locked; /* system time of last locking */
+ s64 time_hold; /* cumulated lock time */
+ s64 time_block; /* cumulated wait time */
+ int idx1; /* index to print (e.g. domain id) or -1 */
+ int idx2; /* index to print (e.g. vcpu nr) or -1 */
+};
+
+#define _LOCK_PROFILE(name, i1, i2) { 0, 0, name, 0, 0, 0, 0, 0, i1, i2 }
+#define _LOCK_PROFILE_ANC(name) ; \
+ static struct lock_profile * __lock_profile_##name \
+ __attribute_used__ __attribute__ ((__section__(".lockprofile.data"))) = \
+ &name.profile
+
+void spinlock_profile_add(struct lock_profile *p);
+void spinlock_profile_rm(struct lock_profile *p);
+
+#else
+struct lock_profile { };
+#define _LOCK_PROFILE(name, i1, i2) { }
+#define _LOCK_PROFILE_ANC(name)
+#define spinlock_profile_add(x) ((void)0)
+#define spinlock_profile_rm(x) ((void)0)
+#endif
+
typedef struct {
raw_spinlock_t raw;
u16 recurse_cpu:12;
u16 recurse_cnt:4;
struct lock_debug debug;
+ struct lock_profile profile;
} spinlock_t;
-#define SPIN_LOCK_UNLOCKED { _RAW_SPIN_LOCK_UNLOCKED, 0xfffu, 0, _LOCK_DEBUG }
-#define DEFINE_SPINLOCK(l) spinlock_t l = SPIN_LOCK_UNLOCKED
+#define SPIN_LOCK_UNLOCKED { _RAW_SPIN_LOCK_UNLOCKED, 0xfffu, 0, _LOCK_DEBUG, \
+ _LOCK_PROFILE(NULL, -1, -1) }
+#define SPIN_LOCK_UNLOCKED_PROF(n, i1, i2) { _RAW_SPIN_LOCK_UNLOCKED, 0xfffu, \
+ 0, _LOCK_DEBUG, _LOCK_PROFILE(n, i1, i2) }
+#define DEFINE_SPINLOCK(l) spinlock_t l = SPIN_LOCK_UNLOCKED_PROF(#l, -1, -1) \
+ _LOCK_PROFILE_ANC(l)
#define spin_lock_init(l) (*(l) = (spinlock_t)SPIN_LOCK_UNLOCKED)
+#define spin_lock_init_prof2(l, n, i1, i2) { \
+ *(l) = (spinlock_t)SPIN_LOCK_UNLOCKED_PROF(n, i1, i2); \
+ spinlock_profile_add(&(l)->profile); }
+#define spin_lock_init_prof1(l, n, i1) spin_lock_init_prof2(l, n, i1, -1)
+#define spin_lock_init_prof(l, n) spin_lock_init_prof2(l, n, -1, -1)
+#define spin_lock_destroy_prof(l) spinlock_profile_rm(&(l)->profile)
typedef struct {
raw_rwlock_t raw;
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