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md/raid5-cache: exclude reclaiming stripes in reclaim check

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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>
This commit is contained in:
Shaohua Li
2017-02-10 16:18:09 -08:00
parent e8fd52eec2
commit e33fbb9cc7
3 changed files with 16 additions and 2 deletions
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2
drivers/md/raid5.h
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@@ -663,6 +663,8 @@ struct r5conf {
struct list_head r5c_full_stripe_list;
atomic_t r5c_cached_partial_stripes;
struct list_head r5c_partial_stripe_list;
atomic_t r5c_flushing_full_stripes;
atomic_t r5c_flushing_partial_stripes;
atomic_t empty_inactive_list_nr;
struct llist_head released_stripes;