linux-kernel - Re: [PATCH v2 10/13] perf header: add a buffer to struct feat

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Message-ID: <20170525081012.GP14467@krava>
Date:   Thu, 25 May 2017 10:10:12 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2 10/13] perf header: add a buffer to struct feat_fd

On Tue, May 23, 2017 at 12:48:50AM -0700, David Carrillo-Cisneros wrote:
> Extend struct feat_fd to use a temporal buffer in pipe-mode, rather
> than a perf.data file.
> 
> Revamp write_pmu_mappings to avoid seeking so that is compatible with
> pipe-mode.
> 
> Print an error when trying to use buf in features that do not support
> pipe-mode.

could you please just list those features in changelog
plus the reason they don't support this

thanks,
jirka