linux-kernel - Re: [PATCH v2]: perf/x86: store user space frame-pointer value on a sample

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Message-ID: <20180523130950.GB12217@hirez.programming.kicks-ass.net>
Date:   Wed, 23 May 2018 15:09:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v2]: perf/x86: store user space frame-pointer value on a
 sample

On Wed, May 23, 2018 at 01:06:58PM +0300, Alexey Budankov wrote:

> Is the patch ready to be up streamed now? 

Please post a new one where you modify the comment about the syscalls
not saving registers and ideally find the commit that made it so.

Also; I think Andy would appreciate a comment near the syscall code that
refers back to this code and states what registers we rely upon being
there (+BP for this patch).