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From: Dennis Zhou <dennis@kernel.org>
To: David Sterba <dsterba@suse.com>, Chris Mason <clm@fb.com>,
	Josef Bacik <josef@toxicpanda.com>,
	Omar Sandoval <osandov@osandov.com>
Cc: kernel-team@fb.com, linux-btrfs@vger.kernel.org,
	Dennis Zhou <dennis@kernel.org>
Subject: [PATCH 18/22] btrfs: only keep track of data extents for async discard
Date: Wed, 23 Oct 2019 18:53:12 -0400
Message-ID: <28b5064229e24388600f6f776621c6443c3e92b7.1571865775.git.dennis@kernel.org> (raw)
In-Reply-To: <cover.1571865774.git.dennis@kernel.org>
In-Reply-To: <cover.1571865774.git.dennis@kernel.org>

As mentioned earlier, discarding data can be done either by issuing an
explicit discard or implicitly by reusing the LBA. Metadata chunks see
much more frequent reuse due to well it being metadata. So instead of
explicitly discarding metadata blocks, just leave them be and let the
latter implicit discarding be done for them.

Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
---
 fs/btrfs/block-group.h |  6 ++++++
 fs/btrfs/discard.c     | 11 +++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/block-group.h b/fs/btrfs/block-group.h
index 88266cc16c07..6a586b2968ac 100644
--- a/fs/btrfs/block-group.h
+++ b/fs/btrfs/block-group.h
@@ -181,6 +181,12 @@ static inline u64 btrfs_block_group_end(struct btrfs_block_group_cache *cache)
 	return (cache->key.objectid + cache->key.offset);
 }
 
+static inline bool btrfs_is_block_group_data(
+					struct btrfs_block_group_cache *cache)
+{
+	return (cache->flags & BTRFS_BLOCK_GROUP_DATA);
+}
+
 #ifdef CONFIG_BTRFS_DEBUG
 static inline int btrfs_should_fragment_free_space(
 		struct btrfs_block_group_cache *block_group)
diff --git a/fs/btrfs/discard.c b/fs/btrfs/discard.c
index 592a5c7b9dc1..be5a4439ceb0 100644
--- a/fs/btrfs/discard.c
+++ b/fs/btrfs/discard.c
@@ -51,6 +51,9 @@ static void __btrfs_add_to_discard_list(struct btrfs_discard_ctl *discard_ctl,
 void btrfs_add_to_discard_list(struct btrfs_discard_ctl *discard_ctl,
 			       struct btrfs_block_group_cache *cache)
 {
+	if (!btrfs_is_block_group_data(cache))
+		return;
+
 	spin_lock(&discard_ctl->lock);
 
 	__btrfs_add_to_discard_list(discard_ctl, cache);
@@ -161,7 +164,10 @@ static struct btrfs_block_group_cache *peek_discard_list(
 	if (cache && now > cache->discard_eligible_time) {
 		if (cache->discard_index == BTRFS_DISCARD_INDEX_UNUSED &&
 		    btrfs_block_group_used(&cache->item) != 0) {
-			__btrfs_add_to_discard_list(discard_ctl, cache);
+			if (btrfs_is_block_group_data(cache))
+				__btrfs_add_to_discard_list(discard_ctl, cache);
+			else
+				list_del_init(&cache->discard_list);
 			goto again;
 		}
 		if (cache->discard_state == BTRFS_DISCARD_RESET_CURSOR) {
@@ -492,7 +498,8 @@ void btrfs_discard_update_discardable(struct btrfs_block_group_cache *cache,
 	s32 extents_delta;
 	s64 bytes_delta;
 
-	if (!cache || !btrfs_test_opt(cache->fs_info, DISCARD_ASYNC))
+	if (!cache || !btrfs_test_opt(cache->fs_info, DISCARD_ASYNC) ||
+	    !btrfs_is_block_group_data(cache))
 		return;
 
 	discard_ctl = &cache->fs_info->discard_ctl;
-- 
2.17.1


  parent reply index

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-23 22:52 [PATCH v2 00/22] btrfs: async discard support Dennis Zhou
2019-10-23 22:52 ` [PATCH 01/22] bitmap: genericize percpu bitmap region iterators Dennis Zhou
2019-10-23 22:52 ` [PATCH 02/22] btrfs: rename DISCARD opt to DISCARD_SYNC Dennis Zhou
2019-10-23 22:52 ` [PATCH 03/22] btrfs: keep track of which extents have been discarded Dennis Zhou
2019-11-08 19:05   ` Josef Bacik
2019-11-11 17:20     ` Dennis Zhou
2019-10-23 22:52 ` [PATCH 04/22] btrfs: keep track of cleanliness of the bitmap Dennis Zhou
2019-11-08 19:12   ` Josef Bacik
2019-10-23 22:52 ` [PATCH 05/22] btrfs: add the beginning of async discard, discard workqueue Dennis Zhou
2019-11-11 18:49   ` David Sterba
2019-10-23 22:53 ` [PATCH 06/22] btrfs: handle empty block_group removal Dennis Zhou
2019-11-08 19:19   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 07/22] btrfs: discard one region at a time in async discard Dennis Zhou
2019-11-08 19:27   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 08/22] btrfs: add removal calls for sysfs debug/ Dennis Zhou
2019-11-08 19:28   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 09/22] btrfs: make UUID/debug have its own kobject Dennis Zhou
2019-11-08 19:29   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 10/22] btrfs: add discard sysfs directory Dennis Zhou
2019-11-08 19:29   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 11/22] btrfs: track discardable extents for async discard Dennis Zhou
2019-10-23 22:53 ` [PATCH 12/22] btrfs: keep track of discardable_bytes Dennis Zhou
2019-11-08 19:31   ` Josef Bacik
2019-10-23 22:53 ` [PATCH 13/22] btrfs: calculate discard delay based on number of extents Dennis Zhou
2019-10-23 22:53 ` [PATCH 14/22] btrfs: add bps discard rate limit Dennis Zhou
2019-11-08 19:41   ` Josef Bacik
2019-11-15 17:28     ` David Sterba
2019-10-23 22:53 ` [PATCH 15/22] btrfs: limit max discard size for async discard Dennis Zhou
2019-10-23 22:53 ` [PATCH 16/22] btrfs: make max async discard size tunable Dennis Zhou
2019-10-23 22:53 ` [PATCH 17/22] btrfs: have multiple discard lists Dennis Zhou
2019-11-08 19:44   ` Josef Bacik
2019-10-23 22:53 ` Dennis Zhou [this message]
2019-11-08 19:46   ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Josef Bacik
2019-11-08 20:14     ` Dennis Zhou
2019-11-15 17:31       ` David Sterba
2019-10-23 22:53 ` [PATCH 19/22] btrfs: keep track of discard reuse stats Dennis Zhou
2019-10-23 22:53 ` [PATCH 20/22] btrfs: add async discard header Dennis Zhou
2019-10-23 22:53 ` [PATCH 21/22] btrfs: increase the metadata allowance for the free_space_cache Dennis Zhou
2019-10-23 22:53 ` [PATCH 22/22] btrfs: make smaller extents more likely to go into bitmaps Dennis Zhou
2019-11-15 17:40 ` [PATCH v2 00/22] btrfs: async discard support David Sterba
2019-11-20 21:50 [PATCH v3 " Dennis Zhou
2019-11-20 21:51 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou
2019-11-25 19:46 [PATCH v4 00/22] btrfs: async discard support Dennis Zhou
2019-11-25 19:46 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou
2019-12-09 19:45 [PATCH v5 00/22] btrfs: async discard support Dennis Zhou
2019-12-09 19:46 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou
2019-12-14  0:22 [PATCH v6 00/22] btrfs: async discard support Dennis Zhou
2019-12-14  0:22 ` [PATCH 18/22] btrfs: only keep track of data extents for async discard Dennis Zhou

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