From: Benjamin Segall <bsegall@google.com>
To: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
Aaron Lu <ziqianlu@bytedance.com>, Josh Don <joshdon@google.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/5] sched/fair: Call update_curr() before unthrottling the hierarchy
Date: Thu, 28 May 2026 15:03:42 -0700 [thread overview]
Message-ID: <xm26h5nrmbsx.fsf@google.com> (raw)
In-Reply-To: <20260528094830.13291-4-kprateek.nayak@amd.com> (K. Prateek Nayak's message of "Thu, 28 May 2026 09:48:28 +0000")
K Prateek Nayak <kprateek.nayak@amd.com> writes:
> Subsequent commits will allow update_curr() to throttle the hierarchy
> when the runtime accounting exceeds allocated quota. Call update_curr()
> before the unthrottle event, and in tg_unthrottle_up() to catch up on
> any remaining runtime and stabilize the "runtime_remaining" and
> "throttle_count" for that cfs_rq.
>
> Doing an update_curr() early ensures the cfs_rq is not throttled right
> back up again when the unthrottle is in progress.
>
> Since all callers of unthrottle_cfs_rq(), except one, already update the
> rq_clock and call rq_clock_start_loop_update(), move the
> update_rq_clock() in unthrottle_cfs_rq() to the lonely caller that
> doesn't update the rq_clock.
Reviewed-By: Benjamin Segall <bsegall@google.com>
next prev parent reply other threads:[~2026-05-28 22:03 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-28 9:48 [PATCH 0/5] sched/fair: Allow account_cfs_rq_runtime() to throttle current hierarchy K Prateek Nayak
2026-05-28 9:48 ` [PATCH 1/5] sched/fair: Convert cfs bandwidth throttling to use guards K Prateek Nayak
2026-05-28 21:46 ` Benjamin Segall
2026-05-28 9:48 ` [PATCH 2/5] sched/fair: Use throttled_csd_list for local unthrottle K Prateek Nayak
2026-05-28 21:53 ` Benjamin Segall
2026-05-28 9:48 ` [PATCH 3/5] sched/fair: Call update_curr() before unthrottling the hierarchy K Prateek Nayak
2026-05-28 22:03 ` Benjamin Segall [this message]
2026-06-01 3:52 ` Aaron Lu
2026-06-01 5:50 ` K Prateek Nayak
2026-06-01 11:27 ` Peter Zijlstra
2026-06-02 6:33 ` K Prateek Nayak
2026-05-28 9:48 ` [PATCH 4/5] sched/fair: Move the throttled tasks to a local list in tg_unthrottle_up() K Prateek Nayak
2026-05-28 22:14 ` Benjamin Segall
2026-05-28 9:48 ` [PATCH 5/5] sched/fair: Unify cfs_rq throttling via account_cfs_rq_runtime() K Prateek Nayak
2026-05-28 22:44 ` Benjamin Segall
2026-06-01 13:48 ` Peter Zijlstra
2026-06-02 7:01 ` K Prateek Nayak
2026-06-02 8:32 ` Peter Zijlstra
2026-06-02 8:57 ` K Prateek Nayak
2026-05-28 11:45 ` [PATCH 0/5] sched/fair: Allow account_cfs_rq_runtime() to throttle current hierarchy Peter Zijlstra
2026-06-01 6:18 ` Aaron Lu
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