From: Chris Hyser <chris.hyser@oracle.com>
To: Peter Zijlstra <peterz@infradead.org>,
"Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc: Nishanth Aravamudan <naravamudan@digitalocean.com>,
Julien Desfossez <jdesfossez@digitalocean.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
Aaron Lu <aaron.lwe@gmail.com>,
Aubrey Li <aubrey.intel@gmail.com>,
tglx@linutronix.de, linux-kernel@vger.kernel.org,
mingo@kernel.org, torvalds@linux-foundation.org,
fweisbec@gmail.com, keescook@chromium.org,
Phil Auld <pauld@redhat.com>,
Valentin Schneider <valentin.schneider@arm.com>,
Mel Gorman <mgorman@techsingularity.net>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
vineeth@bitbyteword.org, Chen Yu <yu.c.chen@intel.com>,
Christian Brauner <christian.brauner@ubuntu.com>,
Agata Gruza <agata.gruza@intel.com>,
Antonio Gomez Iglesias <antonio.gomez.iglesias@intel.com>,
graf@amazon.com, konrad.wilk@oracle.com, dfaggioli@suse.com,
rostedt@goodmis.org, benbjiang@tencent.com,
Alexandre Chartre <alexandre.chartre@oracle.com>,
James.Bottomley@hansenpartnership.com, OWeisse@umich.edu,
Dhaval Giani <dhaval.giani@oracle.com>,
Josh Don <joshdon@google.com>, Hao Luo <haoluo@google.com>,
Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH 2/6] sched: tagging interface for core scheduling
Date: Mon, 22 Mar 2021 13:57:48 -0400 [thread overview]
Message-ID: <ff9c63f2-0953-03c1-9b1c-25cb90954dee@oracle.com> (raw)
In-Reply-To: <20210320154632.GZ4746@worktop.programming.kicks-ass.net>
On 3/20/21 11:46 AM, Peter Zijlstra wrote:
> On Fri, Mar 19, 2021 at 04:32:49PM -0400, Joel Fernandes (Google) wrote:
>> From: Josh Don <joshdon@google.com>
>>
>> Adds per-task and per-cgroup interfaces for specifying which tasks can
>> co-execute on adjacent SMT hyperthreads via core scheduling.
>>
>> The per-task interface hooks are implemented here, but are not currently
>> used. The following patch adds a prctl interface which then takes
>> advantage of these.
>>
>> The cgroup interface can be used to toggle a unique cookie value for all
>> descendent tasks, preventing these tasks from sharing with any others.
>> See Documentation/admin-guide/hw-vuln/core-scheduling.rst for a full
>> rundown.
>>
>> One important property of this interface is that neither the per-task
>> nor the per-cgroup setting overrides the other. For example, if two
>> tasks are in different cgroups, and one or both of the cgroups is tagged
>> using the per-cgroup interface, then these tasks cannot share, even if
>> they use the per-task interface to attempt to share with one another.
>>
>> The above is implemented by making the overall core scheduling cookie a
>> compound structure, containing both a task-level cookie and a
>> group-level cookie. Two tasks will only be allowed to share if all
>> fields of their respective cookies match.
>>
>> Core scheduler has extra overhead. Enable it only for machines with
>> more than one SMT hardware thread.
>
> Oh man.. I'd soooo hoped to first see the simple task interface and then
> see the cgroup patch on top of that... I'll see if I can flip them
> myself (on monday).
Peter, given we need to rebase this and we have some cleanup, we can go ahead and flip the order if you have not yet
done so yet.
-chrish
next prev parent reply other threads:[~2021-03-22 18:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 20:32 [PATCH 0/6] Core scheduling remaining patches Joel Fernandes (Google)
2021-03-19 20:32 ` [PATCH 1/6] sched: migration changes for core scheduling Joel Fernandes (Google)
2021-03-20 15:34 ` Peter Zijlstra
2021-03-21 13:34 ` Li, Aubrey
2021-03-22 7:48 ` Peter Zijlstra
2021-03-22 8:12 ` Li, Aubrey
2021-03-22 8:57 ` Peter Zijlstra
2021-03-22 12:31 ` Li, Aubrey
2021-03-22 12:56 ` Peter Zijlstra
2021-03-22 13:17 ` Li, Aubrey
2021-03-23 3:54 ` Li, Aubrey
2021-03-23 21:21 ` Josh Don
2021-03-19 20:32 ` [PATCH 2/6] sched: tagging interface " Joel Fernandes (Google)
2021-03-20 15:46 ` Peter Zijlstra
2021-03-22 17:57 ` Chris Hyser [this message]
2021-03-22 18:33 ` Peter Zijlstra
2021-03-22 18:35 ` Chris Hyser
2021-03-23 1:15 ` Josh Don
2021-03-19 20:32 ` [PATCH 3/6] sched: prctl() cookie manipulation " Joel Fernandes (Google)
2021-03-20 15:51 ` Peter Zijlstra
2021-03-19 20:32 ` [PATCH 4/6] kselftest: Add tests for core-sched interface Joel Fernandes (Google)
2021-03-19 20:32 ` [PATCH 5/6] Documentation: Add core scheduling documentation Joel Fernandes (Google)
2021-03-19 20:32 ` [PATCH 6/6] sched: Debug bits Joel Fernandes (Google)
2021-03-20 15:40 ` [PATCH 0/6] Core scheduling remaining patches Peter Zijlstra
2021-03-22 14:57 ` Joel Fernandes
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