From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anton Blanchard <anton@samba.org>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Jan Glauber <glauber@gmx.de>,
Linux Arch list <linux-arch@vger.kernel.org>,
schwidefsky@de.ibm.com
Subject: Re: [Patch] SMP call function cleanup
Date: Fri, 23 Apr 2004 10:32:41 +1000 [thread overview]
Message-ID: <1082680360.2077.139.camel@gaston> (raw)
In-Reply-To: <20040423002141.GI22027@krispykreme>
On Fri, 2004-04-23 at 10:21, Anton Blanchard wrote:
> > It's easy for those archs to implement it with a send-all and a software
> > filtering. For the cases where it would be an optimisation to send to
> > a cpumask, it makes sense to provide that function.
>
> Then someone uses it in a performance critical place and my big SMP
> ppc64 performance sucks.
Ah ? OpenPIC can nicely IPI to CPU masks iirc, can't xics ? :)-
> We still havent been given a place in generic code where this
> optimisation makes sense.
I had a few cases where I wanted it until I found different ways to
do things (using RCU mostly), like the PTE freeing race. So far, I
avoided it. But I regulary come up with some idea which would
involve such a thing.
Ben.
next prev parent reply other threads:[~2004-04-23 0:34 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-22 12:21 [Patch] SMP call function cleanup Jan Glauber
2004-04-22 12:28 ` William Lee Irwin III
2004-04-22 12:37 ` Anton Blanchard
2004-04-22 12:49 ` William Lee Irwin III
2004-04-22 12:59 ` James Bottomley
2004-04-22 13:24 ` William Lee Irwin III
2004-04-22 13:46 ` James Bottomley
2004-04-22 14:06 ` William Lee Irwin III
[not found] ` <1082641822.1329.45.camel@halo>
[not found] ` <1082642332.1778.39.camel@mulgrave>
2004-04-22 14:15 ` Jan Glauber
2004-04-23 0:05 ` Benjamin Herrenschmidt
2004-04-23 0:21 ` Anton Blanchard
2004-04-23 0:32 ` Benjamin Herrenschmidt [this message]
2004-04-22 13:58 ` Jan Glauber
2004-04-22 12:33 ` Anton Blanchard
2004-04-22 14:00 ` Jan Glauber
2004-04-22 14:13 ` William Lee Irwin III
2004-04-23 0:04 ` Benjamin Herrenschmidt
2004-04-23 23:38 ` David S. Miller
-- strict thread matches above, loose matches on Subject: below --
2004-04-23 6:46 Martin Schwidefsky
2004-04-23 6:53 Martin Schwidefsky
2004-04-23 7:05 ` Anton Blanchard
2004-04-23 9:00 ` Russell King
2004-04-23 7:46 Martin Schwidefsky
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