linux-kernel - Re: [PATCH RFC] percpu: add data dependency barrier in percpu accessors and operations

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Message-ID: <20140620155210.GA21818@htj.dyndns.org>
Date:	Fri, 20 Jun 2014 11:52:10 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...two.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] percpu: add data dependency barrier in percpu
 accessors and operations

On Fri, Jun 20, 2014 at 10:23:57AM -0500, Christoph Lameter wrote:
> > You're repeatedly getting wayside in the discussion.  What are you
> > suggesting?  Sending IPIs on each percpu allocation?
> 
> No this is about sending an IPI if you want to modify the percpu data of
> another process. There was a mentionig of code that modifies the per cpu
> data of another processor?

Yes, the initialization of percpu areas on allocation.  That was the
*sole* subject of this thread.

-- 
tejun
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