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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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