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

[ Upstream commit 6631142229005e1b1c311a09efe9fb3cfdac8559 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 4d561ee08d054f6b056ae07901c4aabea13d6977..9e8fde348d6147ea99c325038194c39cfb85a970 100644 (file)
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -721,6 +721,7 @@ 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;
 
        /*
@@ -732,7 +733,12 @@ 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;