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thp: compound_trans_order

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Read compound_trans_order safe. Noop for CONFIG_TRANSPARENT_HUGEPAGE=n.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2011-01-13 15:47:16 -08:00 • committed by Linus Torvalds
parent 91600e9e59
commit 37c2ac7872
3 changed files with 26 additions and 12 deletions
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14
include/linux/mm.h
View file

@ -450,6 +450,20 @@ static inline int compound_order(struct page *page)
return (unsigned long)page[1].lru.prev; return (unsigned long)page[1].lru.prev;
} }
static inline int compound_trans_order(struct page *page)
{
int order;
unsigned long flags;
if (!PageHead(page))
return 0;
flags = compound_lock_irqsave(page);
order = compound_order(page);
compound_unlock_irqrestore(page, flags);
return order;
}
static inline void set_compound_order(struct page *page, unsigned long order) static inline void set_compound_order(struct page *page, unsigned long order)
{ {
page[1].lru.prev = (void *)order; page[1].lru.prev = (void *)order;

12
mm/memcontrol.c
View file

@ -1027,10 +1027,6 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{ {
struct page_cgroup *pc; struct page_cgroup *pc;
struct mem_cgroup_per_zone *mz; struct mem_cgroup_per_zone *mz;
int page_size = PAGE_SIZE;
if (PageTransHuge(page))
page_size <<= compound_order(page);
if (mem_cgroup_disabled()) if (mem_cgroup_disabled())
return NULL; return NULL;
@ -2286,8 +2282,10 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
int ret; int ret;
int page_size = PAGE_SIZE; int page_size = PAGE_SIZE;
if (PageTransHuge(page)) if (PageTransHuge(page)) {
page_size <<= compound_order(page); page_size <<= compound_order(page);
VM_BUG_ON(!PageTransHuge(page));
}
pc = lookup_page_cgroup(page); pc = lookup_page_cgroup(page);
/* can happen at boot */ /* can happen at boot */
@ -2558,8 +2556,10 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
if (PageSwapCache(page)) if (PageSwapCache(page))
return NULL; return NULL;
if (PageTransHuge(page)) if (PageTransHuge(page)) {
page_size <<= compound_order(page); page_size <<= compound_order(page);
VM_BUG_ON(!PageTransHuge(page));
}
count = page_size >> PAGE_SHIFT; count = page_size >> PAGE_SHIFT;
/* /*

12
mm/memory-failure.c
View file

@ -203,7 +203,7 @@ static int kill_proc_ao(struct task_struct *t, unsigned long addr, int trapno,
#ifdef __ARCH_SI_TRAPNO #ifdef __ARCH_SI_TRAPNO
si.si_trapno = trapno; si.si_trapno = trapno;
#endif #endif
si.si_addr_lsb = compound_order(compound_head(page)) + PAGE_SHIFT; si.si_addr_lsb = compound_trans_order(compound_head(page)) + PAGE_SHIFT;
/* /*
* Don't use force here, it's convenient if the signal * Don't use force here, it's convenient if the signal
* can be temporarily blocked. * can be temporarily blocked.
@ -930,7 +930,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
static void set_page_hwpoison_huge_page(struct page *hpage) static void set_page_hwpoison_huge_page(struct page *hpage)
{ {
int i; int i;
int nr_pages = 1 << compound_order(hpage); int nr_pages = 1 << compound_trans_order(hpage);
for (i = 0; i < nr_pages; i++) for (i = 0; i < nr_pages; i++)
SetPageHWPoison(hpage + i); SetPageHWPoison(hpage + i);
} }
@ -938,7 +938,7 @@ static void set_page_hwpoison_huge_page(struct page *hpage)
static void clear_page_hwpoison_huge_page(struct page *hpage) static void clear_page_hwpoison_huge_page(struct page *hpage)
{ {
int i; int i;
int nr_pages = 1 << compound_order(hpage); int nr_pages = 1 << compound_trans_order(hpage);
for (i = 0; i < nr_pages; i++) for (i = 0; i < nr_pages; i++)
ClearPageHWPoison(hpage + i); ClearPageHWPoison(hpage + i);
} }
@ -968,7 +968,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
return 0; return 0;
} }
nr_pages = 1 << compound_order(hpage); nr_pages = 1 << compound_trans_order(hpage);
atomic_long_add(nr_pages, &mce_bad_pages); atomic_long_add(nr_pages, &mce_bad_pages);
/* /*
@ -1166,7 +1166,7 @@ int unpoison_memory(unsigned long pfn)
return 0; return 0;
} }
nr_pages = 1 << compound_order(page); nr_pages = 1 << compound_trans_order(page);
if (!get_page_unless_zero(page)) { if (!get_page_unless_zero(page)) {
/* /*
@ -1304,7 +1304,7 @@ static int soft_offline_huge_page(struct page *page, int flags)
} }
done: done:
if (!PageHWPoison(hpage)) if (!PageHWPoison(hpage))
atomic_long_add(1 << compound_order(hpage), &mce_bad_pages); atomic_long_add(1 << compound_trans_order(hpage), &mce_bad_pages);
set_page_hwpoison_huge_page(hpage); set_page_hwpoison_huge_page(hpage);
dequeue_hwpoisoned_huge_page(hpage); dequeue_hwpoisoned_huge_page(hpage);
/* keep elevated page count for bad page */ /* keep elevated page count for bad page */