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Date: Wed, 4 Sep 2013 01:05:38 +0200
Message-ID: <CA+icZUVpb9yrhnaaUf7=0wd4kpWuBW0VpWiK=BfVZoBiRGuJ2Q@mail.gmail.com>
Subject: Re: [PATCH v7 1/4] spinlock: A new lockref structure for lockless
 update of refcount
From: Sedat Dilek <sedat.dilek@gmail.com>
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>
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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

- Sedat -
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