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Commit 877da174 authored by Josef Bacik's avatar Josef Bacik
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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: default avatarJosef Bacik <josef@redhat.com>
parent f104d044

fs/btrfs/extent-tree.c

+3 −2
Original line number Diff line number Diff line
@@ -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();