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SubjectRe: [PATCH v8 0/8] Reduce cross CPU IPI interference
On Sun, 05 Feb 2012 14:33:20 +0100, Gilad Ben-Yossef <> 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 <>
> Acked-by: Peter Zijlstra <>
> CC: Christoph Lameter <>
> CC: Chris Metcalf <>
> CC: Frederic Weisbecker <>
> CC:
> CC: Pekka Enberg <>
> CC: Matt Mackall <>
> CC: Sasha Levin <>
> CC: Rik van Riel <>
> CC: Andi Kleen <>
> CC: Mel Gorman <>
> CC: Andrew Morton <>
> CC: Alexander Viro <>
> CC: Avi Kivity <>
> CC: Michal Nazarewicz <>

Acked-by: Michal Nazarewicz <>

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 <>
> CC: Milton Miller <>

Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp:>--------------ooO--(_)--Ooo--
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