From: Jiang Biao <benbjiang@gmail.com>
To: Josh Don <joshdon@google.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>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Paul Turner <pjt@google.com>, Oleg Rombakh <olegrom@google.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Steve Sistare <steven.sistare@oracle.com>,
Tejun Heo <tj@kernel.org>, Rik van Riel <riel@surriel.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 4/4] sched: adjust sleeper credit for SCHED_IDLE entities
Date: Tue, 24 Aug 2021 16:16:24 +0800 [thread overview]
Message-ID: <CAPJCdBnz7AzAWyD5Sqc4TLy3By1k4PAex8kpaWrcJb=YPwVC8w@mail.gmail.com> (raw)
In-Reply-To: <20210820010403.946838-5-joshdon@google.com>
Hi,
On Fri, 20 Aug 2021 at 09:06, Josh Don <joshdon@google.com> wrote:
>
> Give reduced sleeper credit to SCHED_IDLE entities. As a result, woken
> SCHED_IDLE entities will take longer to preempt normal entities.
>
> The benefit of this change is to make it less likely that a newly woken
> SCHED_IDLE entity will preempt a short-running normal entity before it
> blocks.
>
> We still give a small sleeper credit to SCHED_IDLE entities, so that
> idle<->idle competition retains some fairness.
>
> Example: With HZ=1000, spawned four threads affined to one cpu, one of
> which was set to SCHED_IDLE. Without this patch, wakeup latency for the
> SCHED_IDLE thread was ~1-2ms, with the patch the wakeup latency was
> ~5ms.
>
> Signed-off-by: Josh Don <joshdon@google.com>
Tried to push a similar patch before, but failed. :)
https://lkml.org/lkml/2020/8/20/1773
Please pick my Reviewed-by if you don't mind,
Reviewed-by: Jiang Biao <benbjiang@tencent.com>
> ---
> kernel/sched/fair.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 31f40aa005b9..aa9c046d2aab 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -4230,7 +4230,12 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
>
> /* sleeps up to a single latency don't count. */
> if (!initial) {
> - unsigned long thresh = sysctl_sched_latency;
> + unsigned long thresh;
> +
> + if (se_is_idle(se))
> + thresh = sysctl_sched_min_granularity;
> + else
> + thresh = sysctl_sched_latency;
>
> /*
> * Halve their sleep time's effect, to allow
> --
> 2.33.0.rc2.250.ged5fa647cd-goog
>
next prev parent reply other threads:[~2021-08-24 8:16 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 1:03 [PATCH v3 0/4] SCHED_IDLE extensions Josh Don
2021-08-20 1:04 ` [PATCH v3 2/4] sched: account number of SCHED_IDLE entities on each cfs_rq Josh Don
2021-08-24 7:57 ` Vincent Guittot
2021-09-09 11:18 ` [tip: sched/core] sched: Account " tip-bot2 for Josh Don
2021-10-05 14:12 ` tip-bot2 for Josh Don
2021-08-20 1:04 ` [PATCH v3 3/4] sched: reduce sched slice for SCHED_IDLE entities Josh Don
2021-08-23 10:08 ` Vincent Guittot
2021-08-23 17:40 ` Josh Don
2021-08-24 7:56 ` Vincent Guittot
2021-08-24 10:24 ` Jiang Biao
2021-08-24 17:04 ` Josh Don
2021-08-25 2:43 ` Jiang Biao
2021-09-09 11:18 ` [tip: sched/core] " tip-bot2 for Josh Don
2021-10-05 14:12 ` tip-bot2 for Josh Don
2021-08-20 1:04 ` [PATCH v3 4/4] sched: adjust sleeper credit " Josh Don
2021-08-23 10:09 ` Vincent Guittot
2021-08-24 8:16 ` Jiang Biao [this message]
2021-08-24 17:12 ` Josh Don
2021-09-09 11:18 ` [tip: sched/core] " tip-bot2 for Josh Don
2021-10-05 14:12 ` tip-bot2 for Josh Don
[not found] ` <20210906124702.Q6G0oOWwFOmQSl_jmRms3XQgfz4ROzfE71r3SNgWSf0@z>
2021-09-06 12:47 ` [PATCH v3 1/4] sched: cgroup SCHED_IDLE support alexs
2021-08-20 8:39 ` Tao Zhou
2021-08-23 17:29 ` Josh Don
2021-08-23 22:45 ` Tao Zhou
2021-09-02 1:22 ` Daniel Jordan
2021-09-03 1:21 ` Josh Don
2021-09-08 20:38 ` Daniel Jordan
2021-09-08 18:36 ` Josh Don
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