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| author | Michel Lespinasse <walken@google.com> | 2011-01-13 15:46:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-01-13 17:32:36 -0800 |
| commit | 53a7706d5ed8f1a53ba062b318773160cc476dde (patch) | |
| tree | a1990d90d5af3686b7a83b2bbc2ae6463971efc5 /mm/internal.h | |
| parent | 5fdb2002131cd4e210b9638a4fc932ec7be491d1 (diff) | |
| download | linux-stable-53a7706d5ed8f1a53ba062b318773160cc476dde.tar.gz linux-stable-53a7706d5ed8f1a53ba062b318773160cc476dde.tar.bz2 linux-stable-53a7706d5ed8f1a53ba062b318773160cc476dde.zip | |
mlock: do not hold mmap_sem for extended periods of time
__get_user_pages gets a new 'nonblocking' parameter to signal that the
caller is prepared to re-acquire mmap_sem and retry the operation if
needed. This is used to split off long operations if they are going to
block on a disk transfer, or when we detect contention on the mmap_sem.
[akpm@linux-foundation.org: remove ref to rwsem_is_contended()]
Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
| -rw-r--r-- | mm/internal.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/internal.h b/mm/internal.h index dedb0aff673f..bd4f581f624a 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -243,7 +243,8 @@ static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int len, unsigned int foll_flags, - struct page **pages, struct vm_area_struct **vmas); + struct page **pages, struct vm_area_struct **vmas, + int *nonblocking); #define ZONE_RECLAIM_NOSCAN -2 #define ZONE_RECLAIM_FULL -1 |