From: Valentin Schneider <valentin.schneider@arm.com>
To: Barry Song <21cnbao@gmail.com>,
dietmar.eggemann@arm.com, linux-kernel@vger.kernel.org,
mingo@redhat.com, peterz@infradead.org,
vincent.guittot@linaro.org
Cc: aubrey.li@linux.intel.com, bp@alien8.de, bristot@redhat.com,
bsegall@google.com, catalin.marinas@arm.com,
gregkh@linuxfoundation.org, guodong.xu@linaro.org, hpa@zytor.com,
jonathan.cameron@huawei.com, juri.lelli@redhat.com,
lenb@kernel.org, linux-acpi@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linuxarm@huawei.com,
mark.rutland@arm.com, mgorman@suse.de, msys.mizuma@gmail.com,
prime.zeng@hisilicon.com, rjw@rjwysocki.net, rostedt@goodmis.org,
song.bao.hua@hisilicon.com, sudeep.holla@arm.com,
tglx@linutronix.de, rafael@kernel.org,
tim.c.chen@linux.intel.com, will@kernel.org, x86@kernel.org,
yangyicong@huawei.com,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
Tian Tao <tiantao6@hisilicon.com>
Subject: Re: [PATCH RESEND 1/3] topology: Represent clusters of CPUs within a die
Date: Tue, 05 Oct 2021 17:33:59 +0100 [thread overview]
Message-ID: <87o883l9c8.mognet@arm.com> (raw)
In-Reply-To: <20210924085104.44806-2-21cnbao@gmail.com>
On 24/09/21 20:51, Barry Song wrote:
> void update_siblings_masks(unsigned int cpuid)
> {
> struct cpu_topology *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
> @@ -617,6 +622,11 @@ void update_siblings_masks(unsigned int cpuid)
> if (cpuid_topo->package_id != cpu_topo->package_id)
> continue;
>
> + if (cpuid_topo->cluster_id == cpu_topo->cluster_id) {
> + cpumask_set_cpu(cpu, &cpuid_topo->cluster_sibling);
> + cpumask_set_cpu(cpuid, &cpu_topo->cluster_sibling);
> + }
> +
Hm so without cluster information (e.g. DT system), we have
->cluster_id=-1, we'll essentially copy the package mask into the cluster
mask.
The exposed cluster mask is still <= package mask which is sensible. Are we
fine with that, or do we need/want the mask to be empty in the -1 case? I'm
guessing userspace tools should check for either id!=-1 or if the exclusive
disjucntion of cluster vs package masks is non-empty.
next prev parent reply other threads:[~2021-10-05 16:34 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-24 8:51 [PATCH RESEND 0/3] Represent cluster topology and enable load balance between clusters Barry Song
2021-09-24 8:51 ` [PATCH RESEND 1/3] topology: Represent clusters of CPUs within a die Barry Song
2021-10-05 16:33 ` Valentin Schneider [this message]
2021-10-05 20:43 ` Barry Song
2021-10-06 10:50 ` Barry Song
2021-10-06 12:18 ` Peter Zijlstra
2021-10-06 12:50 ` Barry Song
2021-10-06 13:55 ` Peter Zijlstra
2021-10-07 10:30 ` Barry Song
2021-10-07 10:35 ` Peter Zijlstra
2021-10-06 13:49 ` Valentin Schneider
2021-10-15 9:44 ` [tip: sched/core] " tip-bot2 for Jonathan Cameron
2021-09-24 8:51 ` [PATCH RESEND 2/3] scheduler: Add cluster scheduler level in core and related Kconfig for ARM64 Barry Song
2021-10-05 7:35 ` Peter Zijlstra
2021-10-05 9:01 ` Barry Song
2021-10-05 10:40 ` Peter Zijlstra
2021-09-24 8:51 ` [PATCH RESEND 3/3] scheduler: Add cluster scheduler level for x86 Barry Song
2021-10-15 9:44 ` [tip: sched/core] sched: " tip-bot2 for Tim Chen
2021-10-20 13:12 ` Tom Lendacky
2021-10-20 19:51 ` Peter Zijlstra
2021-10-20 20:08 ` Tom Lendacky
2021-10-20 20:25 ` Peter Zijlstra
2021-10-20 20:36 ` Peter Zijlstra
2021-10-20 20:40 ` Tom Lendacky
2021-10-20 20:40 ` Peter Zijlstra
2021-10-20 20:51 ` Tom Lendacky
2021-10-21 10:32 ` Barry Song
2021-10-21 10:54 ` Barry Song
2021-10-21 13:22 ` Peter Zijlstra
2021-10-21 22:23 ` Song Bao Hua (Barry Song)
2021-10-22 13:31 ` Tom Lendacky
2021-10-22 13:36 ` Peter Zijlstra
2021-10-01 10:32 ` [PATCH RESEND 0/3] Represent cluster topology and enable load balance between clusters Barry Song
2021-10-01 10:39 ` Vincent Guittot
2021-10-01 14:57 ` Peter Zijlstra
2021-10-01 23:22 ` Tim Chen
2021-10-02 7:09 ` Barry Song
2021-10-04 22:54 ` Tim Chen
2021-10-05 7:54 ` Peter Zijlstra
2021-10-05 8:04 ` Peter Zijlstra
2021-10-05 9:06 ` Barry Song
2021-10-05 7:50 ` Peter Zijlstra
2021-10-05 9:15 ` Barry Song
2021-10-05 10:58 ` Peter Zijlstra
2021-10-05 13:42 ` Valentin Schneider
2021-10-05 13:50 ` Valentin Schneider
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