linux-kernel - Re: [PATCH 5/6] blk-cgroup: reimplement basic IO stats using cgroup rstat

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Message-ID: <20191113163501.GI4163745@devbig004.ftw2.facebook.com>
Date:   Wed, 13 Nov 2019 08:35:01 -0800
From:   Tejun Heo <tj@...nel.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     axboe@...nel.dk, cgroups@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        lizefan@...wei.com, hannes@...xchg.org, kernel-team@...com,
        Dan Schatzberg <dschatzberg@...com>, Daniel Xu <dlxu@...com>
Subject: Re: [PATCH 5/6] blk-cgroup: reimplement basic IO stats using cgroup
 rstat

Hello,

Can you please see whether the following patch fixes the issue?

Thanks.

diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h
index 48a66738143d..19394c77ed99 100644
--- a/include/linux/blk-cgroup.h
+++ b/include/linux/blk-cgroup.h
@@ -626,7 +626,8 @@ static inline bool blkcg_bio_issue_check(struct request_queue *q,
 		bis->cur.ios[rwd]++;
 
 		u64_stats_update_end(&bis->sync);
-		cgroup_rstat_updated(blkg->blkcg->css.cgroup, cpu);
+		if (cgroup_subsys_on_dfl(io_cgrp_subsys))
+			cgroup_rstat_updated(blkg->blkcg->css.cgroup, cpu);
 		put_cpu();
 	}