From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: subhra mazumdar <subhra.mazumdar@oracle.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
mingo@redhat.com, tglx@linutronix.de,
prakash.sangappa@oracle.com, dhaval.giani@oracle.com,
daniel.lezcano@linaro.org, vincent.guittot@linaro.org,
viresh.kumar@linaro.org, tim.c.chen@linux.intel.com,
mgorman@techsingularity.net
Subject: Re: [RFC PATCH 3/3] sched: introduce tunables to control soft affinity
Date: Thu, 18 Jul 2019 15:38:16 +0530 [thread overview]
Message-ID: <20190718100816.GA19218@linux.vnet.ibm.com> (raw)
In-Reply-To: <20190626224718.21973-4-subhra.mazumdar@oracle.com>
* subhra mazumdar <subhra.mazumdar@oracle.com> [2019-06-26 15:47:18]:
> For different workloads the optimal "softness" of soft affinity can be
> different. Introduce tunables sched_allowed and sched_preferred that can
> be tuned via /proc. This allows to chose at what utilization difference
> the scheduler will chose cpus_allowed over cpus_preferred in the first
> level of search. Depending on the extent of data sharing, cache coherency
> overhead of the system etc. the optimal point may vary.
>
> Signed-off-by: subhra mazumdar <subhra.mazumdar@oracle.com>
> ---
Correct me but this patchset only seems to be concentrated on the wakeup
path, I don't see any changes in the regular load balancer or the
numa-balancer. If system is loaded or tasks are CPU intensive, then wouldn't
these tasks be moved to cpus_allowed instead of cpus_preferred and hence
breaking this soft affinity.
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2019-07-18 10:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-26 22:47 [RFC PATCH 0/3] Scheduler Soft Affinity subhra mazumdar
2019-06-26 22:47 ` [RFC PATCH 1/3] sched: Introduce new interface for scheduler soft affinity subhra mazumdar
2019-07-02 16:23 ` Peter Zijlstra
2019-07-02 16:29 ` Peter Zijlstra
2019-06-26 22:47 ` [RFC PATCH 2/3] sched: change scheduler to give preference to soft affinity CPUs subhra mazumdar
2019-07-02 17:28 ` Peter Zijlstra
2019-07-17 3:01 ` Subhra Mazumdar
2019-07-18 11:37 ` Peter Zijlstra
2019-07-19 2:55 ` Subhra Mazumdar
2019-06-26 22:47 ` [RFC PATCH 3/3] sched: introduce tunables to control soft affinity subhra mazumdar
2019-07-18 10:08 ` Srikar Dronamraju [this message]
2019-07-19 7:23 ` Subhra Mazumdar
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