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Btrfs: allow shrink_delalloc flush the needed reclaimed pages 

Currently we only allow a maximum of 2 megabytes of pages to be flushed at a
time.  This was ok before, but now we have overcommit which will screw us in a
heartbeat if we are quickly filling the disk.  So instead pick either 2
megabytes or the number of pages we need to reclaim to be safe again, which ever
is larger.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-10-14 14:02:10 -04:00
parent f104d04437
commit 877da17430
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/extent-tree.c
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@ -3343,7 +3343,7 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans,
u64 max_reclaim;
u64 reclaimed = 0;
long time_left;
int nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT;
unsigned long nr_pages = (2 * 1024 * 1024) >> PAGE_CACHE_SHIFT;
int loops = 0;
unsigned long progress;
@ -3366,7 +3366,8 @@ static int shrink_delalloc(struct btrfs_trans_handle *trans,
}
max_reclaim = min(reserved, to_reclaim);
nr_pages = max_t(unsigned long, nr_pages,
max_reclaim >> PAGE_CACHE_SHIFT);
while (loops < 1024) {
/* have the flusher threads jump in and do some IO */
smp_mb();