From:   Daniel Jordan <daniel.m.jordan@oracle.com>
To:     Alexander Duyck <alexanderduyck@fb.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ben Segall <bsegall@google.com>,
        Cornelia Huck <cohuck@redhat.com>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ingo Molnar <mingo@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Michal Hocko <mhocko@suse.com>, Nico Pache <npache@redhat.com>,
        Pasha Tatashin <pasha.tatashin@soleen.com>,
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        Steve Sistare <steven.sistare@oracle.com>,
        Tejun Heo <tj@kernel.org>,
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        Vincent Guittot <vincent.guittot@linaro.org>
Cc:     linux-mm@kvack.org, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        Daniel Jordan <daniel.m.jordan@oracle.com>
Subject: [RFC 16/16] sched/fair: Consider kthread debt in cputime
Date:   Wed,  5 Jan 2022 19:46:56 -0500
Message-Id: <20220106004656.126790-17-daniel.m.jordan@oracle.com>
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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@oracle.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