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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
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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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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