[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xen/arm: map_domain_page: reuse slots with avail == 0
If a slot has avail == 0 but still points to the right mfn, reuse it. Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> --- xen/arch/arm/mm.c | 15 ++++++++------- 1 files changed, 8 insertions(+), 7 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 44ec0e3..cbcb769 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -232,7 +232,13 @@ void *map_domain_page(unsigned long mfn) i < DOMHEAP_ENTRIES; slot = (slot + 1) % DOMHEAP_ENTRIES, i++ ) { - if ( map[slot].pt.avail == 0 ) + if ( map[slot].pt.avail < 0xf && map[slot].pt.base == slot_mfn ) + { + /* This slot already points to the right place; reuse it */ + map[slot].pt.avail++; + break; + } + else if ( map[slot].pt.avail == 0 ) { /* Commandeer this 2MB slot */ pte = mfn_to_xen_entry(slot_mfn); @@ -240,12 +246,7 @@ void *map_domain_page(unsigned long mfn) write_pte(map + slot, pte); break; } - else if ( map[slot].pt.avail < 0xf && map[slot].pt.base == slot_mfn ) - { - /* This slot already points to the right place; reuse it */ - map[slot].pt.avail++; - break; - } + } /* If the map fills up, the callers have misbehaved. */ BUG_ON(i == DOMHEAP_ENTRIES); -- 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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