linux-kernel - Re: perf top -p broken for multithreaded processes since 5.19

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Message-ID: <2fd9b620-e9a8-9cd9-1b4a-6b13d829b2ae@intel.com>
Date:   Fri, 2 Sep 2022 17:50:22 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Tomáš Trnka <trnka@....com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: perf top -p broken for multithreaded processes since 5.19

On 2/09/22 17:46, Tomáš Trnka wrote:
> Hello,
> 
> A bug in perf v5.19 and newer completely breaks monitoring multithreaded
> processes using "perf top -p". The tool fails to start with "Failed to mmap
> with 22 (Invalid argument)". It still seems to work fine on single-threaded
> processes. "perf record" is also unaffected.

It has been reported here:

	https://bugzilla.kernel.org/show_bug.cgi?id=216441