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| author |   Jan Kara <jack@suse.cz> | 2019-02-01 14:21:23 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-02-01 15:46:24 -0800 |
| commit | c27d82f52f75fc9d8d9d40d120d2a96fdeeada5e (patch) | |
| tree | 0151720bb1ba96e8ce742674b96bef291b43fce5 /fs/hostfs | |
| parent | mm: migrate: don't rely on __PageMovable() of newpage after unlocking it (diff) | |
| download | linux-dev-c27d82f52f75fc9d8d9d40d120d2a96fdeeada5e.tar.xz linux-dev-c27d82f52f75fc9d8d9d40d120d2a96fdeeada5e.zip | |
fs/drop_caches.c: avoid softlockups in drop_pagecache_sb()
When superblock has lots of inodes without any pagecache (like is the
case for /proc), drop_pagecache_sb() will iterate through all of them
without dropping sb->s_inode_list_lock which can lead to softlockups
(one of our customers hit this).
Fix the problem by going to the slow path and doing cond_resched() in
case the process needs rescheduling.
Link: http://lkml.kernel.org/r/20190114085343.15011-1-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hostfs')
0 files changed, 0 insertions, 0 deletions