linux-kernel - Re: LatencyTOP infrastructure patch

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Message-Id: <20080121170415.125B.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Mon, 21 Jan 2008 17:06:53 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: LatencyTOP infrastructure patch

Hi

> +static void __sched
> +account_global_scheduler_latency(struct task_struct *tsk, int usecs)
> +{
> +	int i;
> +	int firstnonnull = MAXLR + 1;
> +
> +	if (!tsk->latency_reason.reason)
> +		return;
> +
> +	/* skip kernel threads for now */
> +	if (!tsk->mm)
> +		return;

Why do you ignore kernel thread?

may be, some network filesystem use kernel thread for local I/O.
What do you think it?


- kosaki

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