linux-kernel - Re: [PATCH] perf sched: Fix record failed when CONFIG

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Message-ID: <YPQuqlhPP/mCKDu3@kernel.org>
Date:   Sun, 18 Jul 2021 10:37:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Yang Jihong <yangjihong1@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, laoar.shao@...il.com, rostedt@...dmis.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf sched: Fix record failed when CONFIG_SCHEDSTATS is
 not set

Em Tue, Jul 13, 2021 at 07:23:58PM +0800, Yang Jihong escreveu:
> The tracepoints trace_sched_stat_{wait, sleep, iowait} are not exposed to user
> if CONFIG_SCHEDSTATS is not set, "perf sched record" records the three events.
> As a result, the command fails to be executed.
> 
> Before:
> 
>   #perf sched record sleep 1
>   event syntax error: 'sched:sched_stat_wait'
>                        \___ unknown tracepoint
> 
>   Error:  File /sys/kernel/tracing/events/sched/sched_stat_wait not found.
>   Hint:   Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
> 
>   Run 'perf list' for a list of valid events
> 
>    Usage: perf record [<options>] [<command>]
>       or: perf record [<options>] -- <command> [<options>]
> 
>       -e, --event <event>   event selector. use 'perf list' to list available events
> 
> Solution:
>   Check whether schedstat tracepoints are exposed. If no, these events are not recorded.

Thanks, applied.

- Arnaldo