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[PATCH] mm: bad_page optimisation 

Cut down size slightly by not passing bad_page the function name (it should be
able to be determined by dump_stack()).  And cut down the number of printks in
bad_page.

Also, cut down some branching in the destroy_compound_page path.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-01-06 00:11:11 -08:00 committed by Linus Torvalds
parent 9328b8faae
commit 224abf92b2
1 changed files with 19 additions and 23 deletions
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42
mm/page_alloc.c
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@ -132,16 +132,16 @@ static inline int bad_range(struct zone *zone, struct page *page)
}
#endif
static void bad_page(const char *function, struct page *page)
static void bad_page(struct page *page)
{
printk(KERN_EMERG "Bad page state at %s (in process '%s', page %p)\n",
function, current->comm, page);
printk(KERN_EMERG "flags:0x%0*lx mapping:%p mapcount:%d count:%d\n",
(int)(2*sizeof(unsigned long)), (unsigned long)page->flags,
page->mapping, page_mapcount(page), page_count(page));
printk(KERN_EMERG "Backtrace:\n");
printk(KERN_EMERG "Bad page state in process '%s'\n"
"page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n"
"Trying to fix it up, but a reboot is needed\n"
"Backtrace:\n",
current->comm, page, (int)(2*sizeof(unsigned long)),
(unsigned long)page->flags, page->mapping,
page_mapcount(page), page_count(page));
dump_stack();
printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n");
page->flags &= ~(1 << PG_lru |
1 << PG_private |
1 << PG_locked |
@ -194,19 +194,15 @@ static void destroy_compound_page(struct page *page, unsigned long order)
int i;
int nr_pages = 1 << order;
if (!PageCompound(page))
return;
if (page[1].index != order)
bad_page(__FUNCTION__, page);
if (unlikely(page[1].index != order))
bad_page(page);
for (i = 0; i < nr_pages; i++) {
struct page *p = page + i;
if (!PageCompound(p))
bad_page(__FUNCTION__, page);
if (page_private(p) != (unsigned long)page)
bad_page(__FUNCTION__, page);
if (unlikely(!PageCompound(p) |
(page_private(p) != (unsigned long)page)))
bad_page(page);
ClearPageCompound(p);
}
}
@ -316,7 +312,7 @@ static inline void __free_pages_bulk (struct page *page,
unsigned long page_idx;
int order_size = 1 << order;
if (unlikely(order))
if (unlikely(PageCompound(page)))
destroy_compound_page(page, order);
page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1);
@ -348,7 +344,7 @@ static inline void __free_pages_bulk (struct page *page,
zone->free_area[order].nr_free++;
}
static inline int free_pages_check(const char *function, struct page *page)
static inline int free_pages_check(struct page *page)
{
if (unlikely(page_mapcount(page) |
(page->mapping != NULL) |
@ -363,7 +359,7 @@ static inline int free_pages_check(const char *function, struct page *page)
1 << PG_swapcache |
1 << PG_writeback |
1 << PG_reserved ))))
bad_page(function, page);
bad_page(page);
if (PageDirty(page))
__ClearPageDirty(page);
/*
@ -422,7 +418,7 @@ void __free_pages_ok(struct page *page, unsigned int order)
#endif
for (i = 0 ; i < (1 << order) ; ++i)
reserved += free_pages_check(__FUNCTION__, page + i);
reserved += free_pages_check(page + i);
if (reserved)
return;
@ -517,7 +513,7 @@ static int prep_new_page(struct page *page, int order)
1 << PG_swapcache |
1 << PG_writeback |
1 << PG_reserved ))))
bad_page(__FUNCTION__, page);
bad_page(page);
/*
* For now, we report if PG_reserved was found set, but do not
@ -716,7 +712,7 @@ static void fastcall free_hot_cold_page(struct page *page, int cold)
if (PageAnon(page))
page->mapping = NULL;
if (free_pages_check(__FUNCTION__, page))
if (free_pages_check(page))
return;
inc_page_state(pgfree);