From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Brice Goglin <brice.goglin@gmail.com>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, daniel.sneddon@linux.intel.com,
tony.luck@intel.com, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, linux-perf-users@vger.kernel.org,
Josh Poimboeuf <jpoimboe@kernel.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Liang, Kan" <kan.liang@linux.intel.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH 0/9] Add CPU-type to topology
Date: Thu, 27 Jun 2024 08:22:11 -0700 [thread overview]
Message-ID: <20240627152211.GA5201@ranerica-svr.sc.intel.com> (raw)
In-Reply-To: <16994d97-0499-4e3b-8890-328e74adc91d@gmail.com>
On Wed, Jun 19, 2024 at 11:22:16PM +0200, Brice Goglin wrote:
[...]
> > There can be many ways to expose this information in sysfs. Like this ...
> >
> > > [1] https://lkml.org/lkml/2020/10/2/1208
> > ... exposes /sys/devices/system/cpu/types which, in hybrid parts, creates a
> > subdirectory for each type of CPU. Each subdirectory contains a CPU list
> > and a CPU map that user space can query.
> >
> > The other way is to expose the CPU-type in a file:
> >
> > /sys/devices/system/cpu/cpuN/type
> >
> > that could return the CPU-type of the CPU N. Is there a preference?
>
>
> I'd vote for the former.
+1. With the former you can read all CPUs of a given type in one go whereas
with the latter you have to iterate over all CPUs. By the time you are done
CPUs may have gone offline or online.
next prev parent reply other threads:[~2024-06-27 15:18 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-17 9:11 Pawan Gupta
2024-06-17 9:11 ` [PATCH PATCH 1/9] x86/cpu/topology: Add x86_cpu_type to struct cpuinfo_topology Pawan Gupta
2024-06-17 9:35 ` Andrew Cooper
2024-06-17 17:51 ` Pawan Gupta
2024-06-17 13:24 ` kernel test robot
2024-06-17 13:45 ` kernel test robot
2024-06-18 21:28 ` Borislav Petkov
2024-06-19 3:31 ` Pawan Gupta
2024-06-20 15:51 ` Borislav Petkov
2024-06-21 6:36 ` Pawan Gupta
2024-06-18 21:33 ` Mario Limonciello
2024-06-18 22:03 ` Dave Hansen
2024-06-17 9:11 ` [PATCH PATCH 2/9] cpufreq: intel_pstate: Use topology_cpu_type() to get cpu-type Pawan Gupta
2024-06-17 9:27 ` srinivas pandruvada
2024-06-17 18:36 ` Pawan Gupta
2024-06-17 14:01 ` kernel test robot
2024-06-17 9:11 ` [PATCH PATCH 3/9] perf/x86/intel: " Pawan Gupta
2024-06-17 14:50 ` Dave Hansen
2024-06-17 18:09 ` Pawan Gupta
2024-06-17 18:17 ` Dave Hansen
2024-06-17 18:25 ` Pawan Gupta
2024-06-17 9:11 ` [PATCH PATCH 4/9] x86/cpu: Remove get_this_hybrid_cpu_type() Pawan Gupta
2024-06-17 9:11 ` [PATCH PATCH 5/9] x86/cpu: Name CPU matching macro more generically (and shorten) Pawan Gupta
2024-06-17 9:11 ` [PATCH PATCH 6/9] x86/cpu: Add cpu_type to struct x86_cpu_id Pawan Gupta
2024-06-17 9:12 ` [PATCH PATCH 7/9] x86/cpu: Update x86_match_cpu() to also use cpu-type Pawan Gupta
2024-06-17 9:12 ` [PATCH PATCH 8/9] x86/bugs: Declutter vulnerable CPU list Pawan Gupta
2024-06-17 9:38 ` Andrew Cooper
2024-06-17 18:13 ` Pawan Gupta
2024-06-17 14:13 ` Dave Hansen
2024-06-17 18:14 ` Pawan Gupta
2024-06-17 23:52 ` Pawan Gupta
2024-06-18 0:08 ` Luck, Tony
2024-06-18 3:19 ` Pawan Gupta
2024-06-17 9:12 ` [PATCH PATCH 9/9] x86/rfds: Exclude P-only parts from the RFDS affected list Pawan Gupta
2024-06-17 9:43 ` Andrew Cooper
2024-06-17 14:34 ` Dave Hansen
2024-06-17 18:19 ` Pawan Gupta
2024-06-17 14:33 ` Dave Hansen
2024-06-17 18:24 ` Pawan Gupta
2024-06-18 12:49 ` [PATCH 0/9] Add CPU-type to topology Brice Goglin
2024-06-19 1:53 ` Pawan Gupta
2024-06-19 10:34 ` srinivas pandruvada
2024-06-19 21:25 ` Brice Goglin
2024-06-20 15:06 ` Dave Hansen
2024-06-20 15:22 ` Brice Goglin
2024-06-21 6:23 ` Pawan Gupta
2024-06-27 12:55 ` Ricardo Neri
2024-06-27 12:51 ` Ricardo Neri
2024-06-27 13:22 ` Pawan Gupta
2024-06-27 15:26 ` Ricardo Neri
2024-06-27 16:54 ` Liang, Kan
2024-06-29 11:37 ` Brice Goglin
2024-06-27 12:53 ` Ricardo Neri
2024-06-19 21:22 ` Brice Goglin
2024-06-27 15:22 ` Ricardo Neri [this message]
2024-06-27 15:22 ` Ricardo Neri
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