From: Peter Zijlstra <peterz@infradead.org>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: Barry Song <song.bao.hua@hisilicon.com>,
catalin.marinas@arm.com, will@kernel.org, rjw@rjwysocki.net,
lenb@kernel.org, gregkh@linuxfoundation.org,
Jonathan.Cameron@huawei.com, mingo@redhat.com,
juri.lelli@redhat.com, vincent.guittot@linaro.org,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, mark.rutland@arm.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linuxarm@huawei.com, xuwei5@huawei.com, prime.zeng@hisilicon.com
Subject: Re: [RFC PATCH v2 2/2] scheduler: add scheduler level for clusters
Date: Thu, 3 Dec 2020 10:28:31 +0100 [thread overview]
Message-ID: <20201203092831.GH2414@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <jhj1rg9v7gr.mognet@arm.com>
On Tue, Dec 01, 2020 at 04:04:04PM +0000, Valentin Schneider wrote:
>
> Gating this behind this new config only leveraged by arm64 doesn't make it
> very generic. Note that powerpc also has this newish "CACHE" level which
> seems to overlap in function with your "CLUSTER" one (both are arch
> specific, though).
>
> I think what you are after here is an SD_SHARE_PKG_RESOURCES domain walk,
> i.e. scan CPUs by increasing cache "distance". We already have it in some
> form, as we scan SMT & LLC domains; AFAICT LLC always maps to MC, except
> for said powerpc's CACHE thingie.
There's some intel chips with a smaller L2, but I don't think we ever
bothered.
There's also the extended topology stuff from Intel: SMT, Core, Module,
Tile, Die, of which we've only partially used Die I think.
Whatever we do, it might make sense to not all use different names.
Also, I think Mel said he was cooking something for
select_idle_balance().
Also, I've previously posted patches that fold all the iterations into
one, so it might make sense to revisit some of that if Mel also already
didn.t
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Valentin Schneider <valentin.schneider@arm.com>
Cc: Barry Song <song.bao.hua@hisilicon.com>,
juri.lelli@redhat.com, vincent.guittot@linaro.org,
prime.zeng@hisilicon.com, catalin.marinas@arm.com,
Jonathan.Cameron@huawei.com, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, rostedt@goodmis.org,
linuxarm@huawei.com, bsegall@google.com,
linux-acpi@vger.kernel.org, mingo@redhat.com, mgorman@suse.de,
xuwei5@huawei.com, gregkh@linuxfoundation.org,
mark.rutland@arm.com, will@kernel.org, dietmar.eggemann@arm.com,
linux-arm-kernel@lists.infradead.org, lenb@kernel.org
Subject: Re: [RFC PATCH v2 2/2] scheduler: add scheduler level for clusters
Date: Thu, 3 Dec 2020 10:28:31 +0100 [thread overview]
Message-ID: <20201203092831.GH2414@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <jhj1rg9v7gr.mognet@arm.com>
On Tue, Dec 01, 2020 at 04:04:04PM +0000, Valentin Schneider wrote:
>
> Gating this behind this new config only leveraged by arm64 doesn't make it
> very generic. Note that powerpc also has this newish "CACHE" level which
> seems to overlap in function with your "CLUSTER" one (both are arch
> specific, though).
>
> I think what you are after here is an SD_SHARE_PKG_RESOURCES domain walk,
> i.e. scan CPUs by increasing cache "distance". We already have it in some
> form, as we scan SMT & LLC domains; AFAICT LLC always maps to MC, except
> for said powerpc's CACHE thingie.
There's some intel chips with a smaller L2, but I don't think we ever
bothered.
There's also the extended topology stuff from Intel: SMT, Core, Module,
Tile, Die, of which we've only partially used Die I think.
Whatever we do, it might make sense to not all use different names.
Also, I think Mel said he was cooking something for
select_idle_balance().
Also, I've previously posted patches that fold all the iterations into
one, so it might make sense to revisit some of that if Mel also already
didn.t
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next prev parent reply other threads:[~2020-12-03 9:30 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 2:59 [RFC PATCH v2 0/2] scheduler: expose the topology of clusters and add cluster scheduler Barry Song
2020-12-01 2:59 ` Barry Song
2020-12-01 2:59 ` [RFC PATCH v2 1/2] topology: Represent clusters of CPUs within a die Barry Song
2020-12-01 2:59 ` Barry Song
2020-12-01 16:03 ` Valentin Schneider
2020-12-01 16:03 ` Valentin Schneider
2020-12-02 9:55 ` Sudeep Holla
2020-12-02 9:55 ` Sudeep Holla
2020-12-01 2:59 ` [RFC PATCH v2 2/2] scheduler: add scheduler level for clusters Barry Song
2020-12-01 2:59 ` Barry Song
2020-12-01 16:04 ` Valentin Schneider
2020-12-01 16:04 ` Valentin Schneider
2020-12-03 9:28 ` Peter Zijlstra [this message]
2020-12-03 9:28 ` Peter Zijlstra
2020-12-03 9:49 ` Mel Gorman
2020-12-03 9:49 ` Mel Gorman
2020-12-03 9:57 ` Song Bao Hua (Barry Song)
2020-12-03 9:57 ` Song Bao Hua (Barry Song)
2020-12-03 10:07 ` Peter Zijlstra
2020-12-03 10:07 ` Peter Zijlstra
2020-12-02 8:27 ` Vincent Guittot
2020-12-02 8:27 ` Vincent Guittot
2020-12-02 9:20 ` Song Bao Hua (Barry Song)
2020-12-02 9:20 ` Song Bao Hua (Barry Song)
2020-12-02 10:16 ` Vincent Guittot
2020-12-02 10:16 ` Vincent Guittot
2020-12-02 10:45 ` Song Bao Hua (Barry Song)
2020-12-02 10:45 ` Song Bao Hua (Barry Song)
2020-12-02 10:48 ` Song Bao Hua (Barry Song)
2020-12-02 10:48 ` Song Bao Hua (Barry Song)
2020-12-02 20:58 ` Song Bao Hua (Barry Song)
2020-12-02 20:58 ` Song Bao Hua (Barry Song)
2020-12-03 9:03 ` Vincent Guittot
2020-12-03 9:03 ` Vincent Guittot
2020-12-03 9:11 ` Song Bao Hua (Barry Song)
2020-12-03 9:11 ` Song Bao Hua (Barry Song)
2020-12-03 9:39 ` Vincent Guittot
2020-12-03 9:39 ` Vincent Guittot
2020-12-03 9:54 ` Vincent Guittot
2020-12-03 9:54 ` Vincent Guittot
2020-12-07 9:59 ` Song Bao Hua (Barry Song)
2020-12-07 9:59 ` Song Bao Hua (Barry Song)
2020-12-07 15:29 ` Vincent Guittot
2020-12-07 15:29 ` Vincent Guittot
2020-12-09 11:35 ` Song Bao Hua (Barry Song)
2020-12-09 11:35 ` Song Bao Hua (Barry Song)
2020-12-01 10:46 ` [RFC PATCH v2 0/2] scheduler: expose the topology of clusters and add cluster scheduler Dietmar Eggemann
2020-12-01 10:46 ` Dietmar Eggemann
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