lkml.org 
[lkml]   [2009]   [Mar]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Question about usage of RCU in the input layer
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


\
 
 \ /
  Last update: 2009-03-22 21:55    [W:0.131 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site