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Commit f8350daf authored by Joe Thornber's avatar Joe Thornber Committed by Alasdair G Kergon
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dm cache: tune migration throttling 



Tune the dm cache migration throttling.

i) Issue a tick every second, just in case there's no i/o going through.

ii) Drop the migration threshold right down to something suitable for
background work.

Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 042bcef8

drivers/md/dm-cache-target.c

+2 −1
Original line number Diff line number Diff line
@@ -1445,6 +1445,7 @@ static void do_worker(struct work_struct *ws) 
static void do_waker(struct work_struct *ws)

{

	struct cache *cache = container_of(to_delayed_work(ws), struct cache, waker);

	policy_tick(cache->policy);

	wake_worker(cache);

	queue_delayed_work(cache->wq, &cache->waker, COMMIT_PERIOD);

}
@@ -1886,7 +1887,7 @@ static sector_t calculate_discard_block_size(sector_t cache_block_size, 
	return discard_block_size;

}



#define DEFAULT_MIGRATION_THRESHOLD (2048 * 100)

#define DEFAULT_MIGRATION_THRESHOLD 2048



static int cache_create(struct cache_args *ca, struct cache **result)

{