forked from Minki/linux
dm cache: wake the worker thread every time we free a migration object
When the cache is idle, writeback work was only being issued every second. With this change outstanding writebacks are streamed constantly. This offers a writeback performance improvement. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -418,10 +418,13 @@ static struct dm_cache_migration *alloc_migration(struct cache *cache)
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static void free_migration(struct dm_cache_migration *mg)
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{
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if (atomic_dec_and_test(&mg->cache->nr_allocated_migrations))
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wake_up(&mg->cache->migration_wait);
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struct cache *cache = mg->cache;
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mempool_free(mg, mg->cache->migration_pool);
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if (atomic_dec_and_test(&cache->nr_allocated_migrations))
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wake_up(&cache->migration_wait);
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mempool_free(mg, cache->migration_pool);
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wake_worker(cache);
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}
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static int prealloc_data_structs(struct cache *cache, struct prealloc *p)
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