From: Richard Davies <richard@arachsys.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Shaohua Li <shli@kernel.org>, Rik van Riel <riel@redhat.com>,
Avi Kivity <avi@redhat.com>, QEMU-devel <qemu-devel@nongnu.org>,
KVM <kvm@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/6] Reduce compaction scanning and lock contention
Date: Fri, 21 Sep 2012 10:13:33 +0100 [thread overview]
Message-ID: <20120921091333.GA32081@alpha.arachsys.com> (raw)
In-Reply-To: <1348149875-29678-1-git-send-email-mgorman@suse.de>
Hi Mel,
Thank you for this series. I have applied on clean 3.6-rc5 and tested, and
it works well for me - the lock contention is (still) gone and
isolate_freepages_block is much reduced.
Here is a typical test with these patches:
# grep -F '[k]' report | head -8
65.20% qemu-kvm [kernel.kallsyms] [k] clear_page_c
2.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.56% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.40% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.38% swapper [kernel.kallsyms] [k] default_idle
1.35% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
0.74% ksmd [kernel.kallsyms] [k] memcmp
0.72% qemu-kvm [kernel.kallsyms] [k] free_pages_prepare
I did manage to get a couple which were slightly worse, but nothing like as
bad as before. Here are the results:
# grep -F '[k]' report | head -8
45.60% qemu-kvm [kernel.kallsyms] [k] clear_page_c
11.26% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
3.21% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
2.27% ksmd [kernel.kallsyms] [k] memcmp
2.02% swapper [kernel.kallsyms] [k] default_idle
1.58% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.30% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
1.09% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
# grep -F '[k]' report | head -8
61.29% qemu-kvm [kernel.kallsyms] [k] clear_page_c
4.52% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
2.64% qemu-kvm [kernel.kallsyms] [k] copy_page_c
1.61% swapper [kernel.kallsyms] [k] default_idle
1.57% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.18% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
1.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.11% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
I will follow up with the detailed traces for these three tests.
Thank you!
Richard.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: Richard Davies <richard@arachsys.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Shaohua Li <shli@kernel.org>, Rik van Riel <riel@redhat.com>,
Avi Kivity <avi@redhat.com>, QEMU-devel <qemu-devel@nongnu.org>,
KVM <kvm@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/6] Reduce compaction scanning and lock contention
Date: Fri, 21 Sep 2012 10:13:33 +0100 [thread overview]
Message-ID: <20120921091333.GA32081@alpha.arachsys.com> (raw)
In-Reply-To: <1348149875-29678-1-git-send-email-mgorman@suse.de>
Hi Mel,
Thank you for this series. I have applied on clean 3.6-rc5 and tested, and
it works well for me - the lock contention is (still) gone and
isolate_freepages_block is much reduced.
Here is a typical test with these patches:
# grep -F '[k]' report | head -8
65.20% qemu-kvm [kernel.kallsyms] [k] clear_page_c
2.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.56% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.40% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.38% swapper [kernel.kallsyms] [k] default_idle
1.35% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
0.74% ksmd [kernel.kallsyms] [k] memcmp
0.72% qemu-kvm [kernel.kallsyms] [k] free_pages_prepare
I did manage to get a couple which were slightly worse, but nothing like as
bad as before. Here are the results:
# grep -F '[k]' report | head -8
45.60% qemu-kvm [kernel.kallsyms] [k] clear_page_c
11.26% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
3.21% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
2.27% ksmd [kernel.kallsyms] [k] memcmp
2.02% swapper [kernel.kallsyms] [k] default_idle
1.58% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.30% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
1.09% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
# grep -F '[k]' report | head -8
61.29% qemu-kvm [kernel.kallsyms] [k] clear_page_c
4.52% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
2.64% qemu-kvm [kernel.kallsyms] [k] copy_page_c
1.61% swapper [kernel.kallsyms] [k] default_idle
1.57% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.18% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
1.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.11% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
I will follow up with the detailed traces for these three tests.
Thank you!
Richard.
WARNING: multiple messages have this Message-ID (diff)
From: Richard Davies <richard@arachsys.com>
To: Mel Gorman <mgorman@suse.de>
Cc: KVM <kvm@vger.kernel.org>, QEMU-devel <qemu-devel@nongnu.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>, Avi Kivity <avi@redhat.com>,
Shaohua Li <shli@kernel.org>
Subject: Re: [Qemu-devel] [PATCH 0/6] Reduce compaction scanning and lock contention
Date: Fri, 21 Sep 2012 10:13:33 +0100 [thread overview]
Message-ID: <20120921091333.GA32081@alpha.arachsys.com> (raw)
In-Reply-To: <1348149875-29678-1-git-send-email-mgorman@suse.de>
Hi Mel,
Thank you for this series. I have applied on clean 3.6-rc5 and tested, and
it works well for me - the lock contention is (still) gone and
isolate_freepages_block is much reduced.
Here is a typical test with these patches:
# grep -F '[k]' report | head -8
65.20% qemu-kvm [kernel.kallsyms] [k] clear_page_c
2.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.56% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.40% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.38% swapper [kernel.kallsyms] [k] default_idle
1.35% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
0.74% ksmd [kernel.kallsyms] [k] memcmp
0.72% qemu-kvm [kernel.kallsyms] [k] free_pages_prepare
I did manage to get a couple which were slightly worse, but nothing like as
bad as before. Here are the results:
# grep -F '[k]' report | head -8
45.60% qemu-kvm [kernel.kallsyms] [k] clear_page_c
11.26% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
3.21% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
2.27% ksmd [kernel.kallsyms] [k] memcmp
2.02% swapper [kernel.kallsyms] [k] default_idle
1.58% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
1.30% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
1.09% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
# grep -F '[k]' report | head -8
61.29% qemu-kvm [kernel.kallsyms] [k] clear_page_c
4.52% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock_irqsave
2.64% qemu-kvm [kernel.kallsyms] [k] copy_page_c
1.61% swapper [kernel.kallsyms] [k] default_idle
1.57% qemu-kvm [kernel.kallsyms] [k] _raw_spin_lock
1.18% qemu-kvm [kernel.kallsyms] [k] get_page_from_freelist
1.18% qemu-kvm [kernel.kallsyms] [k] isolate_freepages_block
1.11% qemu-kvm [kernel.kallsyms] [k] svm_vcpu_run
I will follow up with the detailed traces for these three tests.
Thank you!
Richard.
next prev parent reply other threads:[~2012-09-21 9:13 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 14:04 [PATCH 0/6] Reduce compaction scanning and lock contention Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 14:04 ` [PATCH 1/6] mm: compaction: Abort compaction loop if lock is contended or run too long Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:53 ` Rik van Riel
2012-09-20 18:53 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:53 ` Rik van Riel
2012-09-20 14:04 ` [PATCH 2/6] mm: compaction: Acquire the zone->lru_lock as late as possible Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:54 ` Rik van Riel
2012-09-20 18:54 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:54 ` Rik van Riel
2012-09-20 14:04 ` [PATCH 3/6] mm: compaction: Acquire the zone->lock " Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:54 ` Rik van Riel
2012-09-20 18:54 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:54 ` Rik van Riel
2012-09-20 14:04 ` [PATCH 4/6] Revert "mm: have order > 0 compaction start off where it left" Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:54 ` Rik van Riel
2012-09-20 18:54 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:54 ` Rik van Riel
2012-09-20 14:04 ` [PATCH 5/6] mm: compaction: Cache if a pageblock was scanned and no pages were isolated Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:55 ` Rik van Riel
2012-09-20 18:55 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:55 ` Rik van Riel
2012-09-20 14:04 ` [PATCH 6/6] mm: compaction: Restart compaction from near where it left off Mel Gorman
2012-09-20 14:04 ` [Qemu-devel] " Mel Gorman
2012-09-20 14:04 ` Mel Gorman
2012-09-20 18:57 ` Rik van Riel
2012-09-20 18:57 ` [Qemu-devel] " Rik van Riel
2012-09-20 18:57 ` Rik van Riel
2012-09-21 9:13 ` Richard Davies [this message]
2012-09-21 9:13 ` [Qemu-devel] [PATCH 0/6] Reduce compaction scanning and lock contention Richard Davies
2012-09-21 9:13 ` Richard Davies
2012-09-21 9:15 ` Richard Davies
2012-09-21 9:15 ` [Qemu-devel] " Richard Davies
2012-09-21 9:15 ` Richard Davies
2012-09-21 9:17 ` Richard Davies
2012-09-21 9:17 ` [Qemu-devel] " Richard Davies
2012-09-21 9:17 ` Richard Davies
2012-09-21 9:55 ` Mel Gorman
2012-09-21 9:55 ` [Qemu-devel] " Mel Gorman
2012-09-21 9:55 ` Mel Gorman
2012-09-21 9:18 ` Richard Davies
2012-09-21 9:18 ` [Qemu-devel] " Richard Davies
2012-09-21 9:18 ` Richard Davies
2012-09-21 9:35 ` Mel Gorman
2012-09-21 9:35 ` [Qemu-devel] " Mel Gorman
2012-09-21 9:35 ` Mel Gorman
2012-09-21 9:49 ` Richard Davies
2012-09-21 9:49 ` [Qemu-devel] " Richard Davies
2012-09-21 9:49 ` Richard Davies
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=20120921091333.GA32081@alpha.arachsys.com \
--to=richard@arachsys.com \
--cc=avi@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=qemu-devel@nongnu.org \
--cc=riel@redhat.com \
--cc=shli@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.