On Sun, 05 Feb 2012 14:33:20 +0100, Gilad Ben-Yossef [off-list ref] 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@benyossef.com>
Acked-by: Peter Zijlstra <redacted>
CC: Christoph Lameter <redacted>
CC: Chris Metcalf <redacted>
CC: Frederic Weisbecker <redacted>
CC: linux-mm@kvack.org
CC: Pekka Enberg <penberg@kernel.org>
CC: Matt Mackall <redacted>
CC: Sasha Levin <redacted>
CC: Rik van Riel <redacted>
CC: Andi Kleen <redacted>
CC: Mel Gorman <redacted>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Alexander Viro <viro@zeniv.linux.org.uk>
CC: Avi Kivity <redacted>
CC: Michal Nazarewicz <redacted>

Acked-by: Michal Nazarewicz <redacted>

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 <redacted>
CC: Milton Miller <redacted>

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

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