linux-kernel - Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless update of refcount

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Message-ID: <20130903231554.GA15720@redhat.com>
Date:	Tue, 3 Sep 2013 19:15:54 -0400
From:	Dave Jones <davej@...hat.com>
To:	Sedat Dilek <sedat.dilek@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Waiman Long <waiman.long@...com>,
	Ingo Molnar <mingo@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Jeff Layton <jlayton@...hat.com>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Norton, Scott J" <scott.norton@...com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount

On Wed, Sep 04, 2013 at 01:05:38AM +0200, Sedat Dilek wrote:
 > On Wed, Sep 4, 2013 at 12:55 AM, Dave Jones <davej@...hat.com> wrote:
 > > On Wed, Sep 04, 2013 at 12:37:25AM +0200, Sedat Dilek wrote:
 > >
 > >  > > You're spending more time on the task stats than on the actual lookup.
 > >  > > Maybe you should turn off CONFIG_TASKSTATS..But why that whole
 > >  > > irq_return thing? Odd.
 > >  > >
 > >  >
 > >  > [ init/Kconfig ]
 > >  > ...
 > >  > config TASKSTATS
 > >  >         bool "Export task/process statistics through netlink"
 > >  >         depends on NET <--- Difficult to disable it?!
 > >
 > > More likely you're getting bitten by the fact that CONFIG_KVM has
 > > a 'select TASKSTATS'
 > >
 > 
 > With CONFIG_KVM=n ...
 > 
 > $ egrep 'CONFIG_NET=|CONFIG_KVM=|CONFIG_TASKSTATS' .config
 > CONFIG_TASKSTATS=y
 > CONFIG_NET=y

Weird.

sed -i '/TASKSTATS/d' .config
sed -i '/KVM/d' .config
make oldconfig
...
egrep 'CONFIG_NET=|CONFIG_KVM=|CONFIG_TASKSTATS' .config
# CONFIG_TASKSTATS is not set
CONFIG_NET=y


The NET dependancy shouldn't matter at all.
I don't see any other 'select TASKSTATS' in the tree.

	Dave

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