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blkcg, writeback: dead memcgs shouldn't contribute to writeback ownership arbitration

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wbc_account_io() collects information on cgroup ownership of writeback
pages to determine which cgroup should own the inode.  Pages can stay
associated with dead memcgs but we want to avoid attributing IOs to
dead blkcgs as much as possible as the association is likely to be
stale.  However, currently, pages associated with dead memcgs
contribute to the accounting delaying and/or confusing the
arbitration.

Fix it by ignoring pages associated with dead memcgs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-06-13 15:30:41 -07:00 committed by Jens Axboe
parent 71c814077d
commit 6631142229
1 changed files with 7 additions and 1 deletions
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8
fs/fs-writeback.c
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@ -715,6 +715,7 @@ void wbc_detach_inode(struct writeback_control *wbc)
void wbc_account_io(struct writeback_control *wbc, struct page *page,
size_t bytes)
{
struct cgroup_subsys_state *css;
int id;
/*
@ -726,7 +727,12 @@ void wbc_account_io(struct writeback_control *wbc, struct page *page,
if (!wbc->wb)
return;
id = mem_cgroup_css_from_page(page)->id;
css = mem_cgroup_css_from_page(page);
/* dead cgroups shouldn't contribute to inode ownership arbitration */
if (!(css->flags & CSS_ONLINE))
return;
id = css->id;
if (id == wbc->wb_id) {
wbc->wb_bytes += bytes;