linux-kernel - Re: [PATCH v4 3/4] perf/core: Remove pmu linear searching code

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Message-ID: <a1f27798-0b06-7dc3-028b-038512947306@linux.ibm.com>
Date:   Wed, 31 May 2023 11:09:21 +0200
From:   Thomas Richter <tmricht@...ux.ibm.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Peter Zijlstra <peterz@...radead.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Nathan Chancellor <nathan@...nel.org>, namhyung@...nel.org,
        eranian@...gle.com, acme@...nel.org, mark.rutland@....com,
        jolsa@...nel.org, bp@...en8.de, kan.liang@...ux.intel.com,
        adrian.hunter@...el.com, maddy@...ux.ibm.com, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        sandipan.das@....com, ananth.narayan@....com,
        santosh.shukla@....com, kvmarm@...ts.linux.dev
Subject: Re: [PATCH v4 3/4] perf/core: Remove pmu linear searching code

On 5/30/23 16:00, Ian Rogers wrote:
> ls /sys/devices/*/cpu*

Hi Ian,

here is the output yo requested:

# ls /sys/devices/*/cpu*
cpu0  cpu3  cpu6         hotplug     modalias  possible  smt
cpu1  cpu4  cpu7         isolated    offline   present   uevent
cpu2  cpu5  dispatching  kernel_max  online    rescan    vulnerabilities
#

In fact it is the same as 
# ls  /sys/devices/system/cpu/
cpu0  cpu3  cpu6         hotplug     modalias  possible  smt
cpu1  cpu4  cpu7         isolated    offline   present   uevent
cpu2  cpu5  dispatching  kernel_max  online    rescan    vulnerabilities
# 
This directory tree has nothing to do with events for perf, it is
merely used to support CPU hotplug on s390.

The PMUs on s390 are
# ls -ld /sys/devices/{cpum_,pai_}*
drwxr-xr-x 4 root root 0 May 25 15:45 /sys/devices/cpum_cf
drwxr-xr-x 4 root root 0 May 25 15:45 /sys/devices/cpum_cf_diag
drwxr-xr-x 4 root root 0 May 25 15:45 /sys/devices/cpum_sf
drwxr-xr-x 4 root root 0 May 25 15:45 /sys/devices/pai_crypto
drwxr-xr-x 4 root root 0 May 25 15:45 /sys/devices/pai_ext
# 

I hope his helps.

-- 
Thomas Richter, Dept 3303, IBM s390 Linux Development, Boeblingen, Germany
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