lkml.org 
[lkml]   [2012]   [Oct]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH 7/9] rcu: use this_cpu_ptr per-cpu helper instead of per_cpu_ptr(p, raw_smp_processor_id())
On Wed, Oct 31, 2012 at 05:47:04PM +0000, Christoph Lameter wrote:
> On Wed, 31 Oct 2012, Shan Wei wrote:
>
> > Signed-off-by: Shan Wei <davidshan@tencent.com>
> > ---
> > kernel/rcutree.c | 2 +-
> > 1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> > index 74df86b..3a21fcf 100644
> > --- a/kernel/rcutree.c
> > +++ b/kernel/rcutree.c
> > @@ -1960,7 +1960,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
> > struct rcu_node *rnp_old = NULL;
> >
> > /* Funnel through hierarchy to reduce memory contention. */
> > - rnp = per_cpu_ptr(rsp->rda, raw_smp_processor_id())->mynode;
> > + rnp = this_cpu_ptr(rsp->rda)->mynode;
>
> Do
>
> rnp = this_cpu_read(rsp->rda->mynode);
>
> instad.

One thing to keep in mind -- the only purpose of this is to diffuse
memory contention. So there is no need to disable preemption.

Thanx, Paul



\
 
 \ /
  Last update: 2012-10-31 21:21    [W:0.042 / U:0.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site