From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Eric Dumazet <dada1@cosmosbay.com>,
dipankar@in.ibm.com, linux-input@vger.kernel.org,
dmitry.torokhov@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: Question about usage of RCU in the input layer
Date: Sun, 22 Mar 2009 13:52:12 -0700 [thread overview]
Message-ID: <20090322205212.GI7148@linux.vnet.ibm.com> (raw)
In-Reply-To: <20090322124632.5d5d6266@infradead.org>
On Sun, Mar 22, 2009 at 12:46:32PM -0700, Arjan van de Ven wrote:
> On Sun, 22 Mar 2009 09:53:24 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>
> > > > How many synchronize_rcu() calls are you seeing on the boot path?
> > >
> > > I see 20 that hit the above code path (eg ones that wait) until
> > > userspace starts.
> >
> > So with well-behaved readers, the full sequence would be worth
> > something like 50-60 milliseconds.
>
> yeah it's about 10% if the total kernel boot time.. so it does start to
> matter
Half-second boot, eh? That would indeed be impressive.
Thanx, Paul
next prev parent reply other threads:[~2009-03-22 20:52 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-19 4:58 Question about usage of RCU in the input layer Arjan van de Ven
2009-03-19 7:23 ` Dmitry Torokhov
2009-03-19 14:02 ` Arjan van de Ven
2009-03-19 8:56 ` Dipankar Sarma
2009-03-19 14:18 ` Arjan van de Ven
2009-03-20 2:07 ` Paul E. McKenney
2009-03-20 3:20 ` Arjan van de Ven
2009-03-20 4:45 ` Paul E. McKenney
2009-03-20 5:28 ` Eric Dumazet
2009-03-20 6:01 ` Dipankar Sarma
2009-03-20 6:35 ` Eric Dumazet
2009-03-20 13:50 ` Arjan van de Ven
2009-03-20 14:31 ` Paul E. McKenney
2009-03-20 18:13 ` Arjan van de Ven
2009-03-21 1:27 ` Paul E. McKenney
2009-03-21 4:58 ` Arjan van de Ven
2009-03-21 18:58 ` Paul E. McKenney
2009-03-21 19:51 ` Arjan van de Ven
2009-03-21 20:26 ` Eric Dumazet
2009-03-21 21:07 ` Paul E. McKenney
2009-03-22 3:40 ` Arjan van de Ven
2009-03-22 4:38 ` Paul E. McKenney
2009-03-22 4:51 ` Arjan van de Ven
2009-03-22 5:18 ` Paul E. McKenney
2009-03-22 5:53 ` Arjan van de Ven
2009-03-22 16:53 ` Paul E. McKenney
2009-03-22 19:46 ` Arjan van de Ven
2009-03-22 20:52 ` Paul E. McKenney [this message]
2009-03-22 22:44 ` Arjan van de Ven
2009-03-22 23:03 ` Paul E. McKenney
2009-03-22 23:16 ` Arjan van de Ven
2009-03-23 1:27 ` Paul E. McKenney
2009-04-03 1:27 ` Paul E. McKenney
2009-03-21 21:13 ` Arjan van de Ven
2009-03-20 22:21 ` Paul E. McKenney
2009-03-21 5:46 ` Dmitry Torokhov
2009-03-21 9:13 ` Eric Dumazet
2009-03-21 18:58 ` Paul E. McKenney
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