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authorHugh Dickins <hugh@veritas.com>2005-10-29 18:16:03 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-29 21:40:37 -0700
commitfc2acab31be8e869b2d5f6de12f557f6f054f19c (patch)
tree60cf419f5e88c3c46d39675a14649ea1e5849f03 /mm
parent4d6ddfa9242bc3d27fb0f7248f6fdee0299c731f (diff)
downloadop-kernel-dev-fc2acab31be8e869b2d5f6de12f557f6f054f19c.zip
op-kernel-dev-fc2acab31be8e869b2d5f6de12f557f6f054f19c.tar.gz
[PATCH] mm: tlb_finish_mmu forget rss
zap_pte_range has been counting the pages it frees in tlb->freed, then tlb_finish_mmu has used that to update the mm's rss. That got stranger when I added anon_rss, yet updated it by a different route; and stranger when rss and anon_rss became mm_counters with special access macros. And it would no longer be viable if we're relying on page_table_lock to stabilize the mm_counter, but calling tlb_finish_mmu outside that lock. Remove the mmu_gather's freed field, let tlb_finish_mmu stick to its own business, just decrement the rss mm_counter in zap_pte_range (yes, there was some point to batching the update, and a subsequent patch restores that). And forget the anal paranoia of first reading the counter to avoid going negative - if rss does go negative, just fix that bug. Remove the mmu_gather's flushes and avoided_flushes from arm and arm26: no use was being made of them. But arm26 alone was actually using the freed, in the way some others use need_flush: give it a need_flush. arm26 seems to prefer spaces to tabs here: respect that. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 585bb4e..51eb3857 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -582,7 +582,7 @@ static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
if (pte_young(ptent))
mark_page_accessed(page);
}
- tlb->freed++;
+ dec_mm_counter(tlb->mm, rss);
page_remove_rmap(page);
tlb_remove_page(tlb, page);
continue;
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