From: Hugh Dickins <hughd@google•com>
To: Daniel Lezcano <daniel.lezcano@linaro•org>
Cc: Stephen Rothwell <sfr@canb•auug.org.au>,
Andrew Morton <akpm@linux-foundation•org>,
Robert Lee <rob.lee@linaro•org>, Jean Pihet <j-pihet@ti•com>,
Kevin Hilman <khilman@ti•com>,
Deepthi Dharwar <deepthi@linux•vnet.ibm.com>,
Dan Carpenter <dan.carpenter@oracle•com>,
linux-next@vger•kernel.org, linux-kernel@vger•kernel.org
Subject: Re: next-20120313 cpuidle freezes when booting
Date: Wed, 14 Mar 2012 13:30:57 -0700 (PDT) [thread overview]
Message-ID: <alpine.LSU.2.00.1203141325001.1282@eggly.anvils> (raw)
In-Reply-To: <4F60F5B1.8070302@linaro.org>
On Wed, 14 Mar 2012, Daniel Lezcano wrote:
> On 03/14/2012 08:03 PM, Hugh Dickins wrote:
> > On Wed, 14 Mar 2012, Daniel Lezcano wrote:
> > > On 03/13/2012 11:29 PM, Hugh Dickins wrote:
> > > >
> > > > Yesterday's 3.3.0-rc7-next-20120313 gives me unpredictable freezes
> > > > on x86_64, on a ThinkPad T420s - I've not dared it on more machines.
> > >
> > > is it possible you give the cpuidle driver your host is using ?
> >
> > "grep IDLE .config" tells me:
> >
> > CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
> > CONFIG_ARCH_HAS_DEFAULT_IDLE=y
> > CONFIG_CPU_IDLE=y
> > CONFIG_CPU_IDLE_GOV_LADDER=y
> > CONFIG_CPU_IDLE_GOV_MENU=y
> > CONFIG_INTEL_IDLE=y
> > # CONFIG_I7300_IDLE is not set
> >
> > but I've a feeling that isn't what you need to know.
>
> Thanks for these informations, I forgot to ask you for them.
> By the way, do you have CONFIG_ARCH_HAS_CPU_RELAX ?
Yes.
>
> > Is there some /proc or /sys file I can read to tell you?
>
> Yes, the content of /sys/devices/system/cpu/cpuidle/current_driver
intel_idle
> and /sys/devices/system/cpu/cpuidle/current_governor_ro
menu
>
> > Though if it's something that changes dynamically, then what
> > I read now might not be what it would say when things go wrong.
>
> No, that won't change, so the information should be enough for me to find the
> code path where the regression is.
>
> > I expect you've realized by now, I haven't a clue about cpuidle
> > drivers: I hadn't even realized that idleness needs a driver.
>
> No problem, thanks for git bisecting and find the culprit :)
Thank you - let me know if you've something you'd like me to try.
Hugh
next prev parent reply other threads:[~2012-03-14 20:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-13 22:29 next-20120313 cpuidle freezes when booting Hugh Dickins
2012-03-14 11:29 ` Daniel Lezcano
2012-03-14 19:03 ` Hugh Dickins
2012-03-14 19:46 ` Daniel Lezcano
2012-03-14 20:30 ` Hugh Dickins [this message]
2012-03-15 0:09 ` [PATCH] cpuidle : fix random hangs with intel_idle Daniel Lezcano
2012-03-15 0:14 ` Stephen Rothwell
2012-03-15 0:23 ` Hugh Dickins
2012-03-15 2:58 ` Stephen Rothwell
2012-03-16 13:37 ` Amit Kucheria
2012-03-16 14:26 ` Stephen Rothwell
2012-03-20 16:27 ` Rob Lee
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