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Commit 0a451145 authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcache: Use a mempool for mergesort temporary space 



It was a single element mempool before, it's slightly cleaner to just use a real
mempool.

Signed-off-by: default avatarKent Overstreet <kmo@daterainc.com>
parent 78b77bf8

drivers/md/bcache/bcache.h

+1 −6
Original line number Diff line number Diff line
@@ -645,12 +645,7 @@ struct cache_set { 
	 */

	mempool_t		*fill_iter;



	/*

	 * btree_sort() is a merge sort and requires temporary space - single

	 * element mempool

	 */

	struct mutex		sort_lock;

	struct bset		*sort;

	mempool_t		*sort_pool;

	unsigned		sort_crit_factor;



	/* List of buckets we're currently writing data to */

drivers/md/bcache/bset.c

+5 −7
Original line number Diff line number Diff line
@@ -1047,11 +1047,12 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter, 
{

	uint64_t start_time;

	bool remove_stale = !b->written;

	bool used_mempool = false;

	struct bset *out = (void *) __get_free_pages(__GFP_NOWARN|GFP_NOIO,

						     order);

	if (!out) {

		mutex_lock(&b->c->sort_lock);

		out = b->c->sort;

		out = page_address(mempool_alloc(b->c->sort_pool, GFP_NOIO));

		used_mempool = true;

		order = ilog2(bucket_pages(b->c));

	}
@@ -1071,17 +1072,14 @@ static void __btree_sort(struct btree *b, struct btree_iter *iter, 
		out->seq	= b->sets[0].data->seq;

		out->version	= b->sets[0].data->version;

		swap(out, b->sets[0].data);



		if (b->c->sort == b->sets[0].data)

			b->c->sort = out;

	} else {

		b->sets[start].data->keys = out->keys;

		memcpy(b->sets[start].data->start, out->start,

		       (void *) end(out) - (void *) out->start);

	}



	if (out == b->c->sort)

		mutex_unlock(&b->c->sort_lock);

	if (used_mempool)

		mempool_free(virt_to_page(out), b->c->sort_pool);

	else

		free_pages((unsigned long) out, order);

drivers/md/bcache/super.c

+2 −3
Original line number Diff line number Diff line
@@ -1352,7 +1352,6 @@ static void cache_set_free(struct closure *cl) 
			kobject_put(&ca->kobj);



	free_pages((unsigned long) c->uuids, ilog2(bucket_pages(c)));

	free_pages((unsigned long) c->sort, ilog2(bucket_pages(c)));



	if (c->bio_split)

		bioset_free(c->bio_split);
@@ -1489,7 +1488,6 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) 
	init_waitqueue_head(&c->try_wait);

	init_waitqueue_head(&c->bucket_wait);

	sema_init(&c->uuid_write_mutex, 1);

	mutex_init(&c->sort_lock);



	spin_lock_init(&c->sort_time.lock);

	spin_lock_init(&c->btree_gc_time.lock);
@@ -1519,7 +1517,8 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) 
				bucket_pages(c))) ||

	    !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) ||

	    !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio))) ||

	    !(c->sort = alloc_bucket_pages(GFP_KERNEL, c)) ||

	    !(c->sort_pool = mempool_create_page_pool(1,

				ilog2(bucket_pages(c)))) ||

	    !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) ||

	    bch_journal_alloc(c) ||

	    bch_btree_cache_alloc(c) ||