From: Rik van Riel <riel@redhat.com>
To: Richard Davies <richard@arachsys.com>
Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Windows slow boot: contractor wanted
Date: Sat, 25 Aug 2012 14:11:48 -0400 [thread overview]
Message-ID: <50391564.30401@redhat.com> (raw)
In-Reply-To: <20120825174550.GA8619@alpha.arachsys.com>
On 08/25/2012 01:45 PM, Richard Davies wrote:
> Are you talking about these patches?
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=c67fe3752abe6ab47639e2f9b836900c3dc3da84
> http://marc.info/?l=linux-mm&m=134521289221259
>
> If so, I believe those are in 3.6.0-rc3, so I tested with that.
>
> Unfortunately, I can still get the slow boots and perf top showing
> _raw_spin_lock_irqsave.
>
>
> Here are two perf top traces on 3.6.0-rc3. They do look a bit different from
> 3.5.2, but _raw_spin_lock_irqsave is still at the top:
>
> PerfTop: 35272 irqs/sec kernel:98.1% exact: 0.0% [4000Hz cycles], (all, 16 CPUs)
> ------------------------------------------------------------------------------------------------------------------
>
> 61.85% [kernel] [k] _raw_spin_lock_irqsave
> 7.18% [kernel] [k] sub_preempt_count
> 5.03% [kernel] [k] isolate_freepages_block
> 2.49% [kernel] [k] yield_to
> 2.05% [kernel] [k] memcmp
> 2.01% [kernel] [k] compact_zone
> 1.76% [kernel] [k] add_preempt_count
> 1.52% [kernel] [k] _raw_spin_lock
> 1.31% [kernel] [k] kvm_vcpu_on_spin
> 0.92% [kernel] [k] svm_vcpu_run
However, the compaction code is not as prominent as before.
Can you get a backtrace to that _raw_spin_lock_irqsave, to see
from where it is running into lock contention?
It would be good to know whether it is isolate_freepages_block,
yield_to, kvm_vcpu_on_spin or something else...
--
All rights reversed
next prev parent reply other threads:[~2012-08-25 18:11 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 10:47 [Qemu-devel] Windows slow boot: contractor wanted Richard Davies
2012-08-16 11:39 ` Avi Kivity
2012-08-17 12:36 ` Richard Davies
2012-08-17 13:02 ` Robert Vineyard
2012-08-18 14:44 ` Richard Davies
2012-08-19 5:02 ` Brian Jackson
2012-08-20 8:16 ` Richard Davies
2012-08-19 8:40 ` Avi Kivity
2012-08-19 8:51 ` Richard Davies
2012-08-19 14:04 ` Avi Kivity
2012-08-20 13:56 ` Richard Davies
2012-08-21 9:00 ` Avi Kivity
2012-08-21 15:21 ` Richard Davies
2012-08-21 15:39 ` Troy Benjegerdes
2012-08-22 9:08 ` Avi Kivity
2012-08-22 12:40 ` Richard Davies
2012-08-22 12:44 ` Avi Kivity
2012-08-22 14:41 ` Richard Davies
2012-08-22 14:53 ` Avi Kivity
2012-08-22 15:26 ` Richard Davies
2012-08-22 17:22 ` Troy Benjegerdes
2012-08-25 17:51 ` Richard Davies
2012-08-22 15:21 ` Rik van Riel
2012-08-22 15:34 ` Richard Davies
2012-08-25 17:45 ` Richard Davies
2012-08-25 18:11 ` Rik van Riel [this message]
2012-08-26 10:58 ` Richard Davies
2012-09-06 9:20 ` Richard Davies
2012-09-12 10:56 ` [Qemu-devel] Windows VM slow boot Richard Davies
2012-09-12 12:25 ` Mel Gorman
2012-09-12 16:46 ` Richard Davies
2012-09-13 9:50 ` Mel Gorman
2012-09-13 19:47 ` [Qemu-devel] [PATCH 1/2] Revert "mm: have order > 0 compaction start near a pageblock with free pages" Rik van Riel
2012-09-13 19:48 ` [Qemu-devel] [PATCH 2/2] make the compaction "skip ahead" logic robust Rik van Riel
2012-09-13 19:54 ` [Qemu-devel] [PATCH -v2 " Rik van Riel
2012-09-15 15:55 ` Richard Davies
2012-09-16 19:12 ` Richard Davies
2012-09-17 12:26 ` Mel Gorman
2012-09-18 8:14 ` Richard Davies
2012-09-18 11:21 ` Mel Gorman
2012-09-18 17:58 ` Richard Davies
2012-09-17 13:50 ` Rik van Riel
2012-09-17 14:07 ` Mel Gorman
2012-08-16 14:10 ` [Qemu-devel] Windows slow boot: contractor wanted Benoît Canet
2012-08-16 15:53 ` Troy Benjegerdes
2012-09-18 15:12 ` [Qemu-devel] Windows slow boot Michael Tokarev
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=50391564.30401@redhat.com \
--to=riel@redhat.com \
--cc=avi@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
--cc=richard@arachsys.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).