From: Dave Chinner dchinner@redhat.com Subject: Revert "mm: don't reclaim inodes with many attached pages"

This reverts a76cf1a474d7d ("mm: don't reclaim inodes with many attached pages").

This change causes serious changes to page cache and inode cache behaviour and balance, resulting in major performance regressions when combining worklaods such as large file copies and kernel compiles.

https://bugzilla.kernel.org/show_bug.cgi?id=202441

This change is a hack to work around the problems introduced by changing how agressive shrinkers are on small caches in commit 172b06c32b94 ("mm: slowly shrink slabs with a relatively small number of objects"). It creates more problems than it solves, wasn't adequately reviewed or tested, so it needs to be reverted.

Link: http://lkml.kernel.org/r/20190130041707.27750-2-david@fromorbit.com Fixes: a76cf1a474d7d ("mm: don't reclaim inodes with many attached pages") Signed-off-by: Dave Chinner dchinner@redhat.com Cc: Wolfgang Walter linux@stwm.de Cc: Roman Gushchin guro@fb.com Cc: Spock dairinin@gmail.com Cc: Rik van Riel riel@surriel.com Cc: Michal Hocko mhocko@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

fs/inode.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/fs/inode.c~revert-mm-dont-reclaim-inodes-with-many-attached-pages +++ a/fs/inode.c @@ -730,11 +730,8 @@ static enum lru_status inode_lru_isolate return LRU_REMOVED; }

- /* - * Recently referenced inodes and inodes with many attached pages - * get one more pass. - */ - if (inode->i_state & I_REFERENCED || inode->i_data.nrpages > 1) { + /* recently referenced inodes get one more pass */ + if (inode->i_state & I_REFERENCED) { inode->i_state &= ~I_REFERENCED; spin_unlock(&inode->i_lock); return LRU_ROTATE; _