linux-kernel - Re: [PATCH 02/10] posix-timers: Remove dead process posix cpu timers caching

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Date:	Wed, 04 Dec 2013 13:50:34 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	fweisbec@...il.com, tglx@...utronix.de, mingo@...nel.org
CC:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, oleg@...hat.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 02/10] posix-timers: Remove dead process posix cpu timers
 caching

> @@ -1090,13 +1063,8 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
>  			timer->it.cpu.expires = 0;
>  			goto out_unlock;
>  		} else if (unlikely(p->exit_state) && thread_group_empty(p)) {
> -			/*
> -			 * We've noticed that the thread is dead, but
> -			 * not yet reaped.  Take this opportunity to
> -			 * drop our task ref.
> -			 */
> +			/* Optimizations: if the process is dying, no need to rearm */
>  			cpu_timer_sample_group(timer->it_clock, p, &now);

Why do we still need to call cpu_timer_sample_group? You removed to below line which uses
"now".

> -			clear_dead_task(timer, now);
>  			goto out_unlock;
>  		}
>  		spin_lock(&p->sighand->siglock);
> 

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