linux-kernel - Re: [v7 0/8] Reduce cross CPU IPI interference

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAOtvUMeAkPzcZtiPggacMQGa0EywTH5SzcXgWjMtssR6a5KFqA@mail.gmail.com>
Date:	Sun, 29 Jan 2012 10:25:46 +0200
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Frederic Weisbecker <fweisbec@...il.com>, linux-mm@...ck.org,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Avi Kivity <avi@...hat.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Kosaki Motohiro <kosaki.motohiro@...il.com>,
	Milton Miller <miltonm@....com>
Subject: Re: [v7 0/8] Reduce cross CPU IPI interference

On Thu, Jan 26, 2012 at 5:19 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> On Thu, 2012-01-26 at 12:01 +0200, Gilad Ben-Yossef wrote:
> > Gilad Ben-Yossef (8):
> >   smp: introduce a generic on_each_cpu_mask function
> >   arm: move arm over to generic on_each_cpu_mask
> >   tile: move tile to use generic on_each_cpu_mask
> >   smp: add func to IPI cpus based on parameter func
> >   slub: only IPI CPUs that have per cpu obj to flush
> >   fs: only send IPI to invalidate LRU BH when needed
> >   mm: only IPI CPUs to drain local pages if they exist
>
> These patches look very nice!
>
> Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>

Thank you :-)

If this is of interest, I keep a list tracking global IPI and global
task schedulers sources in the core kernel here:
https://github.com/gby/linux/wiki.

I plan to visit all these potential interference source to see if
something can be done to lower their effect on
isolated CPUs over time.

>
> >   mm: add vmstat counters for tracking PCP drains
> >
> I understood from previous postings this patch wasn't meant for
> inclusion, if it is, note that cpumask_weight() is a potentially very
> expensive operation.

Right. The only purpose of the patch is to show the usefulness
of the previous patch in the series. It is not meant for mainline.

Thanks,
Gilad



--
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@...yossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com

"Unfortunately, cache misses are an equal opportunity pain provider."
-- Mike Galbraith, LKML
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/