Re: [PATCH v8 0/8] Reduce cross CPU IPI interference

[Michal Nazarewicz]

On Sun, 05 Feb 2012 14:33:20 +0100, Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx> wrote:
> This patch set, inspired by discussions with Peter Zijlstra and Frederic
> Weisbecker when testing the nohz task patch set, is a first stab at trying
> to explore doing this by locating the places where such global IPI calls
> are being made and turning the global IPI into an IPI for a specific group
> of CPUs.  The purpose of the patch set is to get feedback if this is the
> right way to go for dealing with this issue and indeed, if the issue is
> even worth dealing with at all. Based on the feedback from this patch set
> I plan to offer further patches that address similar issue in other code
> paths.
>
> The patch creates an on_each_cpu_mask and on_each_cpu_cond infrastructure
> API (the former derived from existing arch specific versions in Tile and
> Arm) and uses them to turn several global IPI invocation to per CPU
> group invocations.

> Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
> Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> CC: Christoph Lameter <cl@xxxxxxxxx>
> CC: Chris Metcalf <cmetcalf@xxxxxxxxxx>
> CC: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> CC: linux-mm@xxxxxxxxx
> CC: Pekka Enberg <penberg@xxxxxxxxxx>
> CC: Matt Mackall <mpm@xxxxxxxxxxx>
> CC: Sasha Levin <levinsasha928@xxxxxxxxx>
> CC: Rik van Riel <riel@xxxxxxxxxx>
> CC: Andi Kleen <andi@xxxxxxxxxxxxxx>
> CC: Mel Gorman <mel@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
> CC: Avi Kivity <avi@xxxxxxxxxx>
> CC: Michal Nazarewicz <mina86@xxxxxxxxxx>

Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>

for patches form 1 to 4 and 7.  The other two (5 and 6) look good but
I don't know enough about slub and fs to feel confident acking.

> CC: Kosaki Motohiro <kosaki.motohiro@xxxxxxxxx>
> CC: Milton Miller <miltonm@xxxxxxx>

--
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.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  MichaÅ âmina86â Nazarewicz    (o o)
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