mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-21 01:51:18 +00:00
Code Issues Releases Wiki Activity

btrfs: only enable extent map shrinker for DEBUG builds

Browse source 
commit 534f7eff92 upstream.

Although there are several patches improving the extent map shrinker,
there are still reports of too frequent shrinker behavior, taking too
much CPU for the kswapd process.

So let's only enable extent shrinker for now, until we got more
comprehensive understanding and a better solution.

Link: https://lore.kernel.org/linux-btrfs/3df4acd616a07ef4d2dc6bad668701504b412ffc.camel@intelfx.name/
Link: https://lore.kernel.org/linux-btrfs/c30fd6b3-ca7a-4759-8a53-d42878bf84f7@gmail.com/
Fixes: 956a17d9d0 ("btrfs: add a shrinker for extent maps")
CC: stable@vger.kernel.org # 6.10+
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qu Wenruo 2024-08-16 10:40:38 +09:30 committed by Greg Kroah-Hartman
parent 6e6cf14fb6
commit e5d0b29914
1 changed files with 7 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
fs/btrfs/super.c
View file

@ -2387,7 +2387,13 @@ static long btrfs_nr_cached_objects(struct super_block *sb, struct shrink_contro
trace_btrfs_extent_map_shrinker_count(fs_info, nr);
return nr;
/*
* Only report the real number for DEBUG builds, as there are reports of
* serious performance degradation caused by too frequent shrinks.
*/
if (IS_ENABLED(CONFIG_BTRFS_DEBUG))
return nr;
return 0;
}
static long btrfs_free_cached_objects(struct super_block *sb, struct shrink_control *sc)