linux-kernel - Re: [rfc 19/45] cpu alloc: NFS statistics

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Message-ID: <Pine.LNX.4.64.0711201248330.26745@schroedinger.engr.sgi.com>
Date:	Tue, 20 Nov 2007 12:49:37 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	ak@...e.de, akpm@...ux-foundation.org, travis@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc 19/45] cpu alloc: NFS statistics

On Tue, 20 Nov 2007, Mathieu Desnoyers wrote:

> > Index: linux-2.6/fs/nfs/iostat.h
> > ===================================================================
> > --- linux-2.6.orig/fs/nfs/iostat.h	2007-11-15 21:17:24.391404458 -0800
> > +++ linux-2.6/fs/nfs/iostat.h	2007-11-15 21:25:33.167654066 -0800
> > @@ -123,7 +123,7 @@ static inline void nfs_inc_server_stats(
> >  	int cpu;
> >  
> >  	cpu = get_cpu();
> > -	iostats = per_cpu_ptr(server->io_stats, cpu);
> > +	iostats = CPU_PTR(server->io_stats, cpu);
> >  	iostats->events[stat] ++;
> 
> Is there a way to change this into a CPU_ADD ?

Yes I must have missed that.

Could be

CPU_INC(server->io_stats->events[stat]);

> 
> >  	put_cpu_no_resched();
> 
> Why put_cpu_no_resched here ?

We do not want to reschedule here? We may have already disabled interrupts 
or some such thing.
-
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