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Date: Thu, 25 May 2017 10:10:12 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: David Carrillo-Cisneros <davidcc@google.com>
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>, Simon Que <sque@chromium.org>,
        Wang Nan <wangnan0@huawei.com>, Jiri Olsa <jolsa@kernel.org>,
        He Kuang <hekuang@huawei.com>, Masami Hiramatsu <mhiramat@kernel.org>,
        David Ahern <dsa@cumulusnetworks.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Stephane Eranian <eranian@google.com>, Paul Turner <pjt@google.com>
Subject: Re: [PATCH v2 10/13] perf header: add a buffer to struct feat_fd
Message-ID: <20170525081012.GP14467@krava>
References: <20170523074853.54892-1-davidcc@google.com>
 <20170523074853.54892-11-davidcc@google.com>
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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