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authorShaohua Li <shli@fb.com>2017-02-11 03:18:09 +0300
committerShaohua Li <shli@fb.com>2017-02-13 20:20:05 +0300
commite33fbb9cc73d6502e69eaf1c178e0c39059763ea (patch)
tree3a75c9e524eab2facb854a41e970dfb86fc538c1 /drivers/md/raid5.c
parente8fd52eec2cd25b917983b3f3aa738b722522376 (diff)
downloadlinux-e33fbb9cc73d6502e69eaf1c178e0c39059763ea.tar.xz
md/raid5-cache: exclude reclaiming stripes in reclaim check
stripes which are being reclaimed are still accounted into cached stripes. The reclaim takes time. r5c_do_reclaim isn't aware of the stripes and does unnecessary stripe reclaim. In practice, I saw one stripe is reclaimed one time. This will cause bad IO pattern. Fixing this by excluding the reclaing stripes in the check. Cc: Song Liu <songliubraving@fb.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r--drivers/md/raid5.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index b0d1345c832c..e2fa88fc6a1b 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6838,6 +6838,8 @@ static struct r5conf *setup_conf(struct mddev *mddev)
INIT_LIST_HEAD(&conf->r5c_full_stripe_list);
atomic_set(&conf->r5c_cached_partial_stripes, 0);
INIT_LIST_HEAD(&conf->r5c_partial_stripe_list);
+ atomic_set(&conf->r5c_flushing_full_stripes, 0);
+ atomic_set(&conf->r5c_flushing_partial_stripes, 0);
conf->level = mddev->new_level;
conf->chunk_sectors = mddev->new_chunk_sectors;