From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Alex Thorlton <athorlton@sgi.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
"Eric W . Biederman" <ebiederm@xmission.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Andi Kleen <ak@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Dave Jones <davej@redhat.com>,
David Howells <dhowells@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>,
Michael Kerrisk <mtk.manpages@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, Robin Holt <robinmholt@gmail.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv2 0/9] split page table lock for PMD tables
Date: Fri, 20 Sep 2013 15:31:37 +0300 (EEST) [thread overview]
Message-ID: <20130920123137.BE2F7E0090@blue.fi.intel.com> (raw)
In-Reply-To: <20130919171727.GC6802@sgi.com>
Alex Thorlton wrote:
> On Mon, Sep 16, 2013 at 02:25:31PM +0300, Kirill A. Shutemov wrote:
> > Alex Thorlton noticed that some massivly threaded workloads work poorly,
> > if THP enabled. This patchset fixes this by introducing split page table
> > lock for PMD tables. hugetlbfs is not covered yet.
> >
> > This patchset is based on work by Naoya Horiguchi.
> >
> > Changes:
> > v2:
> > - reuse CONFIG_SPLIT_PTLOCK_CPUS for PMD split lock;
> > - s/huge_pmd_lock/pmd_lock/g;
> > - assume pgtable_pmd_page_ctor() can fail;
> > - fix format line in task_mem() for VmPTE;
> >
> > Benchmark (from Alex): ftp://shell.sgi.com/collect/appsx_test/pthread_test.tar.gz
> > Run on 4 socket Westmere with 128 GiB of RAM.
>
> Kirill,
>
> I'm hitting some performance issues with these patches on our larger
> machines (>=128 cores/256 threads). I've managed to livelock larger
> systems with one of our tests (I'll publish this one soon), and I'm
> actually seeing a performance hit on some of the smaller ones.
Does "performance hit" mean performance degradation?
> I'm currently collecting some results to show the problems I'm hitting, and
> trying to research what's causing the livelock. For now I just wanted to let
> you know that I'm seeing some issues. I'll be in touch with more details.
Looking forward for more details. Thanks for testing.
I'll try to find a bigger machine myself.
--
Kirill A. Shutemov
--
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>
next prev parent reply other threads:[~2013-09-20 12:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-16 11:25 Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 1/9] mm: rename USE_SPLIT_PTLOCKS to USE_SPLIT_PTE_PTLOCKS Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 2/9] mm: convert mm->nr_ptes to atomic_t Kirill A. Shutemov
2013-09-17 14:33 ` Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 3/9] mm: introduce api for split page table lock for PMD level Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 4/9] mm, thp: change pmd_trans_huge_lock() to return taken lock Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 5/9] mm, thp: move ptl taking inside page_check_address_pmd() Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 6/9] mm, thp: do not access mm->pmd_huge_pte directly Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 7/9] mm: convent the rest to new page table lock api Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 8/9] mm: implement split page table lock for PMD level Kirill A. Shutemov
2013-09-17 14:28 ` Kirill A. Shutemov
2013-09-16 11:25 ` [PATCHv2 9/9] x86, mm: enable " Kirill A. Shutemov
2013-09-16 11:44 ` [PATCHv2 0/9] split page table lock for PMD tables Peter Zijlstra
2013-09-16 12:11 ` Kirill A. Shutemov
2013-09-19 17:17 ` Alex Thorlton
2013-09-20 12:31 ` Kirill A. Shutemov [this message]
2013-09-24 16:44 ` Alex Thorlton
2013-09-26 10:50 ` Kirill A. Shutemov
2013-09-26 15:42 ` Kirill A. Shutemov
2013-09-27 0:04 ` Naoya Horiguchi
2013-09-26 21:19 ` Alex Thorlton
2013-09-26 21:38 ` Kirill A. Shutemov
2013-09-26 21:42 ` Kirill A. Shutemov
2013-09-26 21:44 ` Alex Thorlton
2013-09-26 21:43 ` Alex Thorlton
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=20130920123137.BE2F7E0090@blue.fi.intel.com \
--to=kirill.shutemov@linux.intel.com \
--cc=aarcange@redhat.com \
--cc=ak@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=athorlton@sgi.com \
--cc=dave.hansen@intel.com \
--cc=davej@redhat.com \
--cc=dhowells@redhat.com \
--cc=ebiederm@xmission.com \
--cc=fweisbec@gmail.com \
--cc=hannes@cmpxchg.org \
--cc=keescook@chromium.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=mtk.manpages@gmail.com \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=oleg@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=riel@redhat.com \
--cc=robinmholt@gmail.com \
--cc=sedat.dilek@gmail.com \
--cc=srikar@linux.vnet.ibm.com \
--cc=tglx@linutronix.de \
--cc=viro@zeniv.linux.org.uk \
/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