linux-kernel - Re: [PATCH 5/6] perf record: Add 'snapshot' control command

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Message-ID: <64a87689-8ce9-c54a-98fd-b6ad7fd3aa92@intel.com>
Date:   Mon, 31 Aug 2020 10:03:40 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] perf record: Add 'snapshot' control command

On 31/08/20 9:23 am, Andi Kleen wrote:
> On Sat, Aug 29, 2020 at 01:50:14PM +0300, Adrian Hunter wrote:
>> Add 'snapshot' control command to create an AUX area tracing snapshot the
>> same as if sending SIGUSR2. The advantage of the FIFO is that access is
>> governed by access to the FIFO.
> 
> How about the --switch-output SIGUSR2 switch? Could that be handled too?

Presumably, but I have never used --switch-out because Intel PT does not yet
support it (it is on the list of things to do).  Perhaps someone more
familiar with it can add that :-)

> 
> Other than that it looks great. Thanks.
> 
> -Andi
>