From: Tim Chen <tim.c.chen@linux.intel.com>
To: Barry Song <song.bao.hua@hisilicon.com>,
catalin.marinas@arm.com, will@kernel.org, rjw@rjwysocki.net,
vincent.guittot@linaro.org, bp@alien8.de, tglx@linutronix.de,
mingo@redhat.com, lenb@kernel.org, peterz@infradead.org,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de
Cc: msys.mizuma@gmail.com, valentin.schneider@arm.com,
gregkh@linuxfoundation.org, jonathan.cameron@huawei.com,
juri.lelli@redhat.com, mark.rutland@arm.com,
sudeep.holla@arm.com, aubrey.li@linux.intel.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
x86@kernel.org, xuwei5@huawei.com, prime.zeng@hisilicon.com,
guodong.xu@linaro.org, yangyicong@huawei.com,
liguozhu@hisilicon.com, linuxarm@openeuler.org, hpa@zytor.com
Subject: Re: [RFC PATCH v5 4/4] scheduler: Add cluster scheduler level for x86
Date: Tue, 23 Mar 2021 15:50:49 -0700 [thread overview]
Message-ID: <110234d1-22ce-8a9a-eabb-c15ac29a5dcd@linux.intel.com> (raw)
In-Reply-To: <20210319041618.14316-5-song.bao.hua@hisilicon.com>
On 3/18/21 9:16 PM, Barry Song wrote:
> From: Tim Chen <tim.c.chen@linux.intel.com>
>
> There are x86 CPU architectures (e.g. Jacobsville) where L2 cahce
> is shared among a cluster of cores instead of being exclusive
> to one single core.
>
> To prevent oversubscription of L2 cache, load should be
> balanced between such L2 clusters, especially for tasks with
> no shared data.
>
> Also with cluster scheduling policy where tasks are woken up
> in the same L2 cluster, we will benefit from keeping tasks
> related to each other and likely sharing data in the same L2
> cluster.
>
> Add CPU masks of CPUs sharing the L2 cache so we can build such
> L2 cluster scheduler domain.
>
> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
> Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Barry,
Can you also add this chunk to the patch.
Thanks.
Tim
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 2a11ccc14fb1..800fa48c9fcd 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -115,6 +115,7 @@ extern unsigned int __max_die_per_package;
#ifdef CONFIG_SMP
#define topology_die_cpumask(cpu) (per_cpu(cpu_die_map, cpu))
+#define topology_cluster_cpumask(cpu) (cpu_clustergroup_mask(cpu))
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
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next prev parent reply other threads:[~2021-03-23 22:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 4:16 [RFC PATCH v5 0/4] scheduler: expose the topology of clusters and add cluster scheduler Barry Song
2021-03-19 4:16 ` [RFC PATCH v5 1/4] topology: Represent clusters of CPUs within a die Barry Song
2021-03-19 6:35 ` Greg KH
2021-03-19 6:57 ` Song Bao Hua (Barry Song)
2021-03-19 9:36 ` Jonathan Cameron
2021-03-19 10:01 ` Greg KH
2021-04-20 3:30 ` Song Bao Hua (Barry Song)
2021-04-21 4:06 ` Song Bao Hua (Barry Song)
2021-03-19 4:16 ` [RFC PATCH v5 2/4] scheduler: add scheduler level for clusters Barry Song
2021-03-19 4:16 ` [RFC PATCH v5 3/4] scheduler: scan idle cpu in cluster before scanning the whole llc Barry Song
2021-03-19 21:39 ` Song Bao Hua (Barry Song)
2021-03-19 4:16 ` [RFC PATCH v5 4/4] scheduler: Add cluster scheduler level for x86 Barry Song
2021-03-23 22:50 ` Tim Chen [this message]
2021-03-23 23:21 ` Song Bao Hua (Barry Song)
2021-04-20 18:31 ` Tim Chen
2021-04-20 22:31 ` Song Bao Hua (Barry Song)
2021-03-31 10:07 ` Song Bao Hua (Barry Song)
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