From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: "Kleen, Andi" <andi.kleen@intel.com>
Cc: Nick Piggin <npiggin@suse.de>,
"alexs.shi@intel.com" <alexs.shi@intel.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: RE: scalability investigation: Where can I get your latest patches?
Date: Wed, 04 Aug 2010 15:58:37 +0800 [thread overview]
Message-ID: <1280908717.2125.33.camel@ymzhang.sh.intel.com> (raw)
In-Reply-To: <F4DF93C7785E2549970341072BC32CD78D8FC01B@irsmsx503.ger.corp.intel.com>
On Wed, 2010-08-04 at 08:21 +0100, Kleen, Andi wrote:
> > Issues:
> > 1) Compiling fails on a couple of file systems, such like
> > CONFIG_ISO9660_FS=y.
> > 2) dbenchthreads has about 50% regression. We connect a JBOD of 12
> > disks to
> > a machine. Start 4 dbench threads per disk.
> > We run the workload under a regular user account. If we run it under
> > root account,
> > we get 22% improvement instead of regression.
> > The root cause is ACL checking. With your patch, do_path_lookup firstly
> > goes through
> > rcu steps which including a exec permission checking. With ACL, the
> > __exec_permission
> > always fails. Then a later nameidata_drop_rcu often fails as dentry-
> > >d_seq is changed.
>
> I believe the latest version of Nick's patchkit has a likely fix for that.
>
> http://git.kernel.org/?p=linux/kernel/git/npiggin/linux-npiggin.git;a=commitdiff;h=9edd35f9aeafc8a5e1688b84cf4488a94898ca45
Thanks Andi. The patch has no ext3 part.
next prev parent reply other threads:[~2010-08-04 7:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1278579387.2096.889.camel@ymzhang.sh.intel.com>
[not found] ` <20100720031201.GC21274@amd>
2010-08-04 1:04 ` scalability investigation: Where can I get your latest patches? Zhang, Yanmin
2010-08-04 7:21 ` Kleen, Andi
2010-08-04 7:58 ` Zhang, Yanmin [this message]
2010-08-04 8:06 ` Kleen, Andi
2010-08-04 8:50 ` Zhang, Yanmin
2010-08-05 10:57 ` Nick Piggin
2010-08-05 10:55 ` Nick Piggin
2010-08-09 2:11 ` Zhang, Yanmin
2010-08-09 3:20 ` Zhang, Yanmin
2010-08-05 11:44 ` Nick Piggin
2010-08-09 2:36 ` Zhang, Yanmin
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