From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: linux-kernel@vger.kernel.org,
Rusty Russell <rusty@rustcorp.com.au>,
Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: [PATCH] stopmachine: add stopmachine_timeout
Date: Mon, 14 Jul 2008 13:51:25 +0200 [thread overview]
Message-ID: <200807141351.25092.borntraeger@de.ibm.com> (raw)
In-Reply-To: <487B05CE.1050508@jp.fujitsu.com>
Am Montag, 14. Juli 2008 schrieb Hidetoshi Seto:
> + /* Wait all others come to life */
> + while (cpus_weight(prepared_cpus) != num_online_cpus() - 1) {
> + if (time_is_before_jiffies(limit))
> + goto timeout;
> + cpu_relax();
> + }
> +
Hmm. I think this could become interesting on virtual machines. The hypervisor
might be to busy to schedule a specific cpu at certain load scenarios. This
would cause a failure even if the cpu is not really locked up. We had similar
problems with the soft lockup daemon on s390.
It would be good to not-use wall-clock time, but really used cpu time instead.
Unfortunately I have no idea, if that is possible in a generic way.
Heiko, any ideas?
next prev parent reply other threads:[~2008-07-14 11:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-14 7:52 Hidetoshi Seto
2008-07-14 8:19 ` Hidetoshi Seto
2008-07-14 10:43 ` Rusty Russell
2008-07-15 1:11 ` Hidetoshi Seto
2008-07-15 7:50 ` Rusty Russell
2008-07-16 4:05 ` Hidetoshi Seto
2008-07-20 9:45 ` Rusty Russell
2008-07-22 3:28 ` [PATCH] stopmachine: allow force progress on timeout Hidetoshi Seto
2008-07-14 11:51 ` Christian Borntraeger [this message]
2008-07-14 12:34 ` [PATCH] stopmachine: add stopmachine_timeout Rusty Russell
2008-07-14 18:56 ` Jeremy Fitzhardinge
2008-07-14 21:20 ` Heiko Carstens
2008-07-15 1:14 ` Rusty Russell
2008-07-15 2:24 ` Hidetoshi Seto
2008-07-15 2:37 ` Max Krasnyansky
2008-07-15 2:24 ` Max Krasnyansky
2008-07-15 6:09 ` Heiko Carstens
2008-07-15 8:09 ` Rusty Russell
2008-07-15 8:39 ` Heiko Carstens
2008-07-15 8:51 ` Max Krasnyansky
2008-07-16 9:15 ` Christian Borntraeger
2008-07-16 4:27 ` [PATCH] stopmachine: add stopmachine_timeout v2 Hidetoshi Seto
2008-07-16 6:23 ` Max Krasnyansky
2008-07-16 6:35 ` Hidetoshi Seto
2008-07-16 6:51 ` [PATCH] stopmachine: add stopmachine_timeout v3 Hidetoshi Seto
2008-07-16 7:33 ` Peter Zijlstra
2008-07-16 8:12 ` Hidetoshi Seto
2008-07-16 10:11 ` [PATCH] stopmachine: add stopmachine_timeout v2 Jeremy Fitzhardinge
2008-07-17 3:40 ` Hidetoshi Seto
2008-07-17 5:37 ` Jeremy Fitzhardinge
2008-07-18 4:18 ` Rusty Russell
2008-07-17 6:12 ` [PATCH] stopmachine: add stopmachine_timeout v4 Hidetoshi Seto
2008-07-17 7:09 ` Max Krasnyansky
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