linux-kernel - Re: [PATCH] perf inject: Fix repipe usage

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Message-ID: <YGcdDoPaVpkM1DBm@kernel.org>
Date:   Fri, 2 Apr 2021 10:33:02 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf inject: Fix repipe usage

Em Thu, Apr 01, 2021 at 04:05:13PM +0200, Jiri Olsa escreveu:
> On Thu, Apr 01, 2021 at 01:36:05PM +0300, Adrian Hunter wrote:
> > Since commit 14d3d5405253 ("perf session: Try to read pipe data from file")
> > perf inject has started printing "PERFILE2h" when not processing pipes.
> > 
> > The commit exposed perf to the possiblity that the input is not a pipe but
> > the 'repipe' parameter gets used. That causes the printing because perf
> > inject sets 'repipe' to true always.
> > 
> > The 'repipe' parameter of perf_session__new() is used by 2 functions:
> > 	- perf_file_header__read_pipe()
> > 	- trace_report()
> > In both cases, the functions copy data to STDOUT_FILENO when 'repipe' is
> > true.
> > 
> > Fix by setting 'repipe' to true only if the output is a pipe.
> > 
> > Fixes: e558a5bd8b74 ("perf inject: Work with files")
> > Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo