linux-kernel - Re: [PATCH v5 12/17] perf: Skip user unwind if !current->mm

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Message-ID: <20250424130122.4b6ee0df@gandalf.local.home>
Date: Thu, 24 Apr 2025 13:01:22 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Masami
 Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org, Ingo Molnar <mingo@...nel.org>, Arnaldo Carvalho de Melo
 <acme@...nel.org>, Indu Bhagat <indu.bhagat@...cle.com>, Alexander Shishkin
 <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, Adrian
 Hunter <adrian.hunter@...el.com>, linux-perf-users@...r.kernel.org, Mark
 Brown <broonie@...nel.org>, linux-toolchains@...r.kernel.org, Jordan Rome
 <jordalgo@...a.com>, Sam James <sam@...too.org>, Andrii Nakryiko
 <andrii.nakryiko@...il.com>, Jens Remus <jremus@...ux.ibm.com>, Florian
 Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org>, Weinan Liu
 <wnliu@...gle.com>, Blake Jones <blakejones@...gle.com>, Beau Belgrave
 <beaub@...ux.microsoft.com>, "Jose E. Marchesi" <jemarch@....org>
Subject: Re: [PATCH v5 12/17] perf: Skip user unwind if !current->mm

On Thu, 24 Apr 2025 18:37:18 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> > Note from v4: https://lore.kernel.org/all/24cde1381495cd637f0d5663ab7629572bc0eca6.1737511963.git.jpoimboe@kernel.org/
> > 
> > - From the previous version, Peter Zijlstra brought up concern about
> >   io_uring helpers, but this was never resolved. No update was made.  
> 
> What is there to resolve? If you want to check for kthreads, don't check
> for ->mm

I misunderstood what the issue was then ;-)

OK, so the check should be task->flags & PF_KTHREAD ?

-- Steve