From: Paul Mackerras <paulus@samba.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: benh@kernel.crashing.org, "Robin H. Johnson" <robbat2@gentoo.org>,
linux-kernel@vger.kernel.org
Subject: Re: Idle loadavg of ~1, maybe MD related
Date: Sun, 6 Jan 2008 22:21:57 +1100 [thread overview]
Message-ID: <18304.47573.556627.975776@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <20080105190506.38dcf45e.akpm@linux-foundation.org>
Andrew Morton writes:
> Maybe, but we can usually work around it pretty comfortably.
>
> If smu_set_fan() is only ever called by a kernel thread then we can simply
> flip it over to using wait_for_completion_interruptible().
>
> If smu_set_fan() is also called from user processes then things aren't so
> easy...
I believe most of the time spent waiting is actually spent inside the
i2c layer in uninterruptible sleeps.
Robin, what does the "motherboard" line in /proc/cpuinfo say on your
machine?
Paul.
next prev parent reply other threads:[~2008-01-06 11:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-30 10:06 Robin H. Johnson
2008-01-05 9:30 ` Andrew Morton
2008-01-05 10:04 ` Robin H. Johnson
2008-01-05 10:18 ` Benjamin Herrenschmidt
2008-01-06 3:05 ` Andrew Morton
2008-01-06 3:53 ` Benjamin Herrenschmidt
2008-01-06 11:21 ` Paul Mackerras [this message]
2008-01-06 11:29 ` Robin H. Johnson
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