linux-kernel - Re: [patch 15/44] posix-cpu-timer: Comsolidate thread group sample code

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Message-ID: <20190819190745.GA68079@gmail.com>
Date:   Mon, 19 Aug 2019 21:07:45 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        John Stultz <john.stultz@...aro.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: Re: [patch 15/44] posix-cpu-timer: Comsolidate thread group sample
 code


in the title:

  s/Comsolidate
   /Consolidate

* Thomas Gleixner <tglx@...utronix.de> wrote:

> cpu_clock_sample_group() and cpu_timer_sample_group() are almost the
> same. Before the rename one called thread_group_cputimer() and the other
> thread_group_cputime(). Really intuitive function names.
> 
> Consolidate the functions and also avoid the thread traversal when
> the thread group accounting is already active.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  kernel/time/posix-cpu-timers.c |   59 +++++++++++++----------------------------
>  1 file changed, 20 insertions(+), 39 deletions(-)
> 
> --- a/kernel/time/posix-cpu-timers.c
> +++ b/kernel/time/posix-cpu-timers.c
> @@ -294,29 +294,37 @@ thread_group_start_cputime(struct task_s
>  }
>  
>  /*
> - * Sample a process (thread group) clock for the given group_leader task.
> - * Must be called with task sighand lock held for safe while_each_thread()
> - * traversal.
> + * Sample a process (thread group) clock for the given task clkid. If the
> + * groups cputime accounting is already enabled, read the atomic
> + * store. Otherwise a full update is required.  task sighand lock must be
> + * held to protect the task traversal on a full update.

 s/groups
  /group's

 s/task sighand
  /Task sighand

Thanks,

	Ingo