linux-kernel - [RFC 16/16] sched/fair: Consider kthread debt in cputime

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Date:   Wed,  5 Jan 2022 19:46:56 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Alexander Duyck <alexanderduyck@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ben Segall <bsegall@...gle.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ingo Molnar <mingo@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Josh Triplett <josh@...htriplett.org>,
        Michal Hocko <mhocko@...e.com>, Nico Pache <npache@...hat.com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Steve Sistare <steven.sistare@...cle.com>,
        Tejun Heo <tj@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     linux-mm@...ck.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Daniel Jordan <daniel.m.jordan@...cle.com>
Subject: [RFC 16/16] sched/fair: Consider kthread debt in cputime

kthreads that charge their CPU time to a remote task group should be
accounted for in cgroup's cputime statistics.

Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
---
 kernel/sched/fair.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3c2d7f245c68..b3ebb34c475b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -11524,6 +11524,11 @@ static void cpu_cgroup_remote(struct task_struct *p, struct task_group *tg,
 			goto out;
 
 		incur_cfs_debt(rq, se, tg, debt);
+
+		/* cputime accounting is only supported in cgroup2. */
+		__cgroup_account_cputime(tg->css.cgroup, debt);
+		__cgroup_account_cputime_field(tg->css.cgroup, CPUTIME_SYSTEM,
+					       debt);
 	}
 
 out:
-- 
2.34.1