linux-kernel - Re: [resend PATCH for 3.2] procfs: do not confuse jiffies with cputime64

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Message-ID: <m2vcp852ov.fsf@igel.home>
Date:	Thu, 22 Dec 2011 11:19:12 +0100
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Dave Jones <davej@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [resend PATCH for 3.2] procfs: do not confuse jiffies with cputime64_t

Andrew Morton <akpm@...ux-foundation.org> writes:

> From: Andreas Schwab <schwab@...ux-m68k.org>
> Subject: procfs: do not confuse jiffies with cputime64_t
>
> get_{idle,iowait}_time are supposed to return cputime64_t values, not
> jiffies.  Add usecs_to_cputime64 for this.

Subject: procfs: do not confuse jiffies with cputime64_t

Commit 2a95ea6c0d129b4568fb64e1deda16ceb20e6636 ("procfs: do not
overflow get_{idle,iowait}_time for nohz") did not take into account
that one some architectures jiffies and cputime use different units.
Instead of converting the usec value returned by
get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function
usecs_to_cputime64 to convert it to the correct unit of cputime64_t.

Signed-off-by: Andreas Schwab <schwab@...ux-m68k.org>

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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