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authorWu Fengguang <fengguang.wu@intel.com>2011-12-16 12:32:57 -0500
committerChris Mason <chris.mason@oracle.com>2011-12-16 12:32:57 -0500
commit142349f541d0bb6bc3e0d4563268105aada42b0b (patch)
treec86e13b5cf8b87b3b4f3c5218442e221ce17f67b /fs
parentdc47ce90c3a822cd7c9e9339fe4d5f61dcb26b50 (diff)
downloadop-kernel-dev-142349f541d0bb6bc3e0d4563268105aada42b0b.zip
op-kernel-dev-142349f541d0bb6bc3e0d4563268105aada42b0b.tar.gz
btrfs: lower the dirty balance poll interval
Tests show that the original large intervals can easily make the dirty limit exceeded on 100 concurrent dd's. So adapt to as large as the next check point selected by the dirty throttling algorithm. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/file.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index dafdfa0..52305a8 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1167,6 +1167,8 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) /
PAGE_CACHE_SIZE, PAGE_CACHE_SIZE /
(sizeof(struct page *)));
+ nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied);
+ nrptrs = max(nrptrs, 8);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
if (!pages)
return -ENOMEM;
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