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[PATCH] mm: more rmap debugging

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Add more debugging in the rmap code in an attempt to locate to source of
the occasional "mapcount went negative" assertions.

Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-12-22 01:09:33 -08:00
committed by Linus Torvalds
parent 19900cdee2
commit 7de6b80579
5 changed files with 15 additions and 8 deletions
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4
mm/memory.c
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@@ -681,7 +681,7 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
mark_page_accessed(page);
file_rss--;
}
page_remove_rmap(page);
page_remove_rmap(page, vma);
tlb_remove_page(tlb, page);
continue;
}
@@ -1586,7 +1586,7 @@ gotten:
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
if (likely(pte_same(*page_table, orig_pte))) {
if (old_page) {
page_remove_rmap(old_page);
page_remove_rmap(old_page, vma);
if (!PageAnon(old_page)) {
dec_mm_counter(mm, file_rss);
inc_mm_counter(mm, anon_rss);