From: Ingo Molnar <mingo@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
x86-ml <x86@kernel.org>, lkml <linux-kernel@vger.kernel.org>,
tiwai@suse.de, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: irq 16: nobody cared
Date: Mon, 22 Apr 2013 10:01:36 +0200 [thread overview]
Message-ID: <20130422080136.GA7080@gmail.com> (raw)
In-Reply-To: <20130421221242.GB4593@pd.tnic>
* Borislav Petkov <bp@alien8.de> wrote:
> From 3c155e9a22036839c09d98a4acbc7e17a5a3783c Mon Sep 17 00:00:00 2001
> From: Borislav Petkov <bp@suse.de>
> Date: Sun, 21 Apr 2013 23:56:15 +0200
> Subject: [PATCH] RCU: Expedite grace periods during suspend/resume
>
> Paul says CONFIG_RCU_FAST_NO_HZ can increase grace-period durations by a
> factor of four. This, in turn, can change timings during suspend and can
> delay interrupts handling, leading to "IRQ XX: nobody cared" splats and
> the machine disabling those interrupt lines for no sensible reason.
>
> Thus, we want to temporarily switch to expedited grace periods when
> suspending the box and return to normal settings when resuming. This
> patch does exactly that.
Hm, this really smells like a workaround: treating the symptom, not the
cause.
How can an increase in grace-periods break drivers and suspend? Do we
understand exactly what happens there? If we do, can we fix that instead
of tweaking the RCU timeouts?
Thanks,
Ingo
next prev parent reply other threads:[~2013-04-22 8:01 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-20 18:53 irq 16: nobody cared Borislav Petkov
2013-04-20 23:52 ` Paul E. McKenney
2013-04-21 10:34 ` Borislav Petkov
2013-04-21 16:30 ` Paul E. McKenney
2013-04-21 16:56 ` Borislav Petkov
2013-04-21 18:10 ` Borislav Petkov
2013-04-21 18:56 ` Paul E. McKenney
2013-04-21 19:06 ` Borislav Petkov
2013-04-21 20:34 ` Paul E. McKenney
2013-04-21 20:51 ` Borislav Petkov
2013-04-21 21:42 ` Borislav Petkov
2013-04-21 22:00 ` Paul E. McKenney
2013-04-21 22:12 ` Borislav Petkov
2013-04-22 8:01 ` Ingo Molnar [this message]
2013-04-22 9:18 ` Borislav Petkov
2013-04-22 13:16 ` Paul E. McKenney
2013-04-21 18:47 ` Paul E. McKenney
2013-04-22 8:32 ` Takashi Iwai
2013-04-22 9:13 ` Borislav Petkov
2013-04-22 9:19 ` Takashi Iwai
2013-04-22 10:06 ` Borislav Petkov
2013-04-22 11:33 ` Takashi Iwai
2013-04-22 13:56 ` Borislav Petkov
2013-04-22 12:56 ` Thomas Gleixner
2013-04-22 14:23 ` Borislav Petkov
2013-04-22 14:44 ` Paul E. McKenney
2013-04-22 21:33 ` Borislav Petkov
2013-04-22 22:07 ` Paul E. McKenney
2013-04-23 14:10 ` Thomas Gleixner
2013-04-23 14:34 ` Borislav Petkov
2013-04-23 15:01 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130422080136.GA7080@gmail.com \
--to=mingo@kernel.org \
--cc=bp@alien8.de \
--cc=linux-kernel@vger.kernel.org \
--cc=paulmck@linux.vnet.ibm.com \
--cc=tglx@linutronix.de \
--cc=tiwai@suse.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.