linux-kernel - Re: [PATCH 1/10] Add generic helpers for arch IPI function calls

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Date:	Fri, 6 Jun 2008 10:44:27 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	npiggin@...e.de, linux-arch@...r.kernel.org, jeremy@...p.org,
	mingo@...e.hu
Subject: Re: [PATCH 1/10] Add generic helpers for arch IPI function calls

On Fri, May 30 2008, Paul E. McKenney wrote:
> On Thu, May 29, 2008 at 10:58:15AM +0200, Jens Axboe wrote:
> > This adds kernel/smp.c which contains helpers for IPI function calls. In
> > addition to supporting the existing smp_call_function() in a more efficient
> > manner, it also adds a more scalable variant called smp_call_function_single()
> > for calling a given function on a single CPU only.
> > 
> > The core of this is based on the x86-64 patch from Nick Piggin, lots of
> > changes since then. "Alan D. Brunelle" <Alan.Brunelle@...com> has
> > contributed lots of fixes and suggestions as well. Also thanks to
> > Paul E. McKenney <paulmck@...ux.vnet.ibm.com> for reviewing RCU usage
> > and getting rid of the data allocation fallback deadlock.
> 
> Looks much improved!!!  A few suggestions for header comments, and
> there appears to be a leftover memory barrier that should now be
> removed.  With these changes:

Thanks Paul, I added the three extra comments to the kerneldoc for those
functions. And you are right about write ordering memory barrier, we
don't need that anymore.

-- 
Jens Axboe

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