linux-kernel - Re: [PATCH v4 05/12] perf record: start threads in the beginning of trace streaming

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Message-ID: <20210408142139.GE3762101@tassilo.jf.intel.com>
Date:   Thu, 8 Apr 2021 07:21:39 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     "Bayduraev, Alexey V" <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexei Budankov <abudankov@...wei.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>
Subject: Re: [PATCH v4 05/12] perf record: start threads in the beginning of
 trace streaming

> +	err = write(thread->pipes.ack[1], &msg, sizeof(msg));
> +	if (err == -1)
> +		pr_err("threads[%d]: failed to notify on start. Error %m", thread->tid);

It might be safer to not use %m. I'm not sure if all the non glibc
libcs that people use support it.