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[PATCH] mm: VM_BUG_ON

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Introduce a VM_BUG_ON, which is turned on with CONFIG_DEBUG_VM.  Use this
in the lightweight, inline refcounting functions; PageLRU and PageActive
checks in vmscan, because they're pretty well confined to vmscan.  And in
page allocate/free fastpaths which can be the hottest parts of the kernel
for kbuilds.

Unlike BUG_ON, VM_BUG_ON must not be used to execute statements with
side-effects, and should not be used outside core mm code.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin
2006-09-25 23:30:55 -07:00
committed by Linus Torvalds
parent a6ca1b99ed
commit 725d704eca
5 changed files with 36 additions and 29 deletions
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16
mm/vmscan.c
View File

@ -440,7 +440,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
if (TestSetPageLocked(page))
goto keep;
BUG_ON(PageActive(page));
VM_BUG_ON(PageActive(page));
sc->nr_scanned++;
@ -564,7 +564,7 @@ keep_locked:
unlock_page(page);
keep:
list_add(&page->lru, &ret_pages);
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
}
list_splice(&ret_pages, page_list);
if (pagevec_count(&freed_pvec))
@ -603,7 +603,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
page = lru_to_page(src);
prefetchw_prev_lru_page(page, src, flags);
BUG_ON(!PageLRU(page));
VM_BUG_ON(!PageLRU(page));
list_del(&page->lru);
target = src;
@ -674,7 +674,7 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
*/
while (!list_empty(&page_list)) {
page = lru_to_page(&page_list);
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
list_del(&page->lru);
if (PageActive(page))
@ -797,9 +797,9 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
while (!list_empty(&l_inactive)) {
page = lru_to_page(&l_inactive);
prefetchw_prev_lru_page(page, &l_inactive, flags);
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
BUG_ON(!PageActive(page));
VM_BUG_ON(!PageActive(page));
ClearPageActive(page);
list_move(&page->lru, &zone->inactive_list);
@ -827,9 +827,9 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone,
while (!list_empty(&l_active)) {
page = lru_to_page(&l_active);
prefetchw_prev_lru_page(page, &l_active, flags);
BUG_ON(PageLRU(page));
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
BUG_ON(!PageActive(page));
VM_BUG_ON(!PageActive(page));
list_move(&page->lru, &zone->active_list);
pgmoved++;
if (!pagevec_add(&pvec, page)) {