Date: Tue, 3 Sep 2013 19:15:54 -0400
From: Dave Jones <davej@redhat.com>
To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Waiman Long <waiman.long@hp.com>, Ingo Molnar <mingo@kernel.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jeff Layton <jlayton@redhat.com>, Miklos Szeredi <mszeredi@suse.cz>,
        Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>, Andi Kleen <andi@firstfloor.org>,
        "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        "Norton, Scott J" <scott.norton@hp.com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
Message-ID: <20130903231554.GA15720@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	Sedat Dilek <sedat.dilek@gmail.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Waiman Long <waiman.long@hp.com>, Ingo Molnar <mingo@kernel.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Jeff Layton <jlayton@redhat.com>, Miklos Szeredi <mszeredi@suse.cz>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Andi Kleen <andi@firstfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@hp.com>,
	"Norton, Scott J" <scott.norton@hp.com>
References: <CA+55aFxvEjdEFK0dXn783eVN0PEXVhb5k8OnrbxSWDpXgyTwWw@mail.gmail.com>
 <CA+icZUXcn6-A+AW5bu_pfRdOcScsNyn3-OZe6n93S5NUEzHtcg@mail.gmail.com>
 <CA+55aFwHx=tCzdo50jJB0ey7-CTVSo6RRQHe6R9fAya7nPn00A@mail.gmail.com>
 <CA+icZUWmQHWHMr1symL7j0iYqUMJBiOuRJ=EJz4F-xkQtdnJLg@mail.gmail.com>
 <CA+55aFxwjx30pC=kcfvOzgJvt2KK9DLm2i6JKYYz+mtOOJEnMA@mail.gmail.com>
 <CA+icZUUwy=sbt6BOirH6N4mSrQOykb=Z3GSdCb7vy_eVfG2RYw@mail.gmail.com>
 <CA+55aFwU054C+zC+G+JrF4ngWvVmvD9WPGWaT_2=nF2j7bpHxA@mail.gmail.com>
 <CA+icZUXi-YHK23sKnVQbfi4K2FOVZiROQ76H5Qw2NxTJT2uzDQ@mail.gmail.com>
 <20130903225528.GA14909@redhat.com>
 <CA+icZUVpb9yrhnaaUf7=0wd4kpWuBW0VpWiK=BfVZoBiRGuJ2Q@mail.gmail.com>
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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@redhat.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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