diff options
| author | Andrew Morton <akpm@linux-foundation.org> | 2007-02-28 20:13:21 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-03-09 10:50:31 -0800 |
| commit | 5b214a4e6cf6557ca118c3dd5843b809f0d2fde9 (patch) | |
| tree | 87f76a74ad43fe3e55c4347d4afc1a97dee69e9c /mm | |
| parent | 0ad1314a8374ed30092752d8406e9cc5940f58fa (diff) | |
throttle_vm_writeout(): don't loop on GFP_NOFS and GFP_NOIO allocations
throttle_vm_writeout() is designed to wait for the dirty levels to subside.
But if the caller holds IO or FS locks, we might be holding up that writeout.
So change it to take a single nap to give other devices a chance to clean some
memory, then return.
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page-writeback.c | 13 | ||||
| -rw-r--r-- | mm/vmscan.c | 2 |
2 files changed, 12 insertions, 3 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index be0efbde499..17255ab1d38 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -296,11 +296,21 @@ void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, } EXPORT_SYMBOL(balance_dirty_pages_ratelimited_nr); -void throttle_vm_writeout(void) +void throttle_vm_writeout(gfp_t gfp_mask) { long background_thresh; long dirty_thresh; + if ((gfp_mask & (__GFP_FS|__GFP_IO)) != (__GFP_FS|__GFP_IO)) { + /* + * The caller might hold locks which can prevent IO completion + * or progress in the filesystem. So we cannot just sit here + * waiting for IO to complete. + */ + congestion_wait(WRITE, HZ/10); + return; + } + for ( ; ; ) { get_dirty_limits(&background_thresh, &dirty_thresh, NULL); @@ -317,7 +327,6 @@ void throttle_vm_writeout(void) } } - /* * writeback at least _min_pages, and keep writing until the amount of dirty * memory is less than the background threshold, or until we're all clean. diff --git a/mm/vmscan.c b/mm/vmscan.c index 7430df68cb6..5b4528a49df 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -949,7 +949,7 @@ static unsigned long shrink_zone(int priority, struct zone *zone, } } - throttle_vm_writeout(); + throttle_vm_writeout(sc->gfp_mask); atomic_dec(&zone->reclaim_in_progress); return nr_reclaimed; |