From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
To: Ingo Oeser <ioe-lkml@rameria.de>
Cc: linux-kernel@vger.kernel.org, Florian Weimer <fw@deneb.enyo.de>,
Linus Torvalds <torvalds@osdl.org>,
7eggert@gmx.de, Christoph Lameter <clameter@sgi.com>,
akpm@osdl.org, linux-ia64@vger.kernel.org, linux-mm@kvack.org
Subject: Re: Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED free maps
Date: Sun, 26 Dec 2004 21:33:05 -0700 (MST) [thread overview]
Message-ID: <Pine.LNX.4.61.0412262131410.17702@montezuma.fsmlabs.com> (raw)
In-Reply-To: <200412270237.53368.ioe-lkml@rameria.de>
On Mon, 27 Dec 2004, Ingo Oeser wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Monday 27 December 2004 00:24, Florian Weimer wrote:
> > By the way, some crazy idea that occurred to me: What about
> > incrementally scrubbing a page which has been assigned previously to
> > this CPU, while spinning inside spinlocks (or busy-waiting somewhere
> > else)?
>
> Crazy idea, indeed. spinlocks are like safety belts: You should
> actually not need them in the normal case, but they will save your butt
> and you'll be glad you have them, when they actually trigger.
>
> So if you are making serious progress here, you have just uncovered
> a spinlockcontention problem in the kernel ;-)
You'd also be evicting the cache contents thus making the lock contention
case even worse.
next prev parent reply other threads:[~2004-12-27 4:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.n0l29ap.1nqg39@ifi.uio.no>
[not found] ` <fa.n04s9ar.17sg3f@ifi.uio.no>
2004-12-24 21:10 ` Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED free maps Bodo Eggert
2004-12-26 23:02 ` Florian Weimer
2004-12-26 23:12 ` Linus Torvalds
2004-12-26 23:24 ` Florian Weimer
2004-12-27 1:37 ` Ingo Oeser
2004-12-27 4:33 ` Zwane Mwaikambo [this message]
2004-12-27 0:01 ` Chris Wedgwood
2005-01-03 20:30 ` Christoph Lameter
[not found] <B8E391BBE9FE384DAA4C5C003888BE6F02900FBD@scsmsx401.amr.corp.intel.com>
[not found] ` <41C20E3E.3070209@yahoo.com.au>
2004-12-21 19:55 ` Increase page fault rate by prezeroing V1 [0/3]: Overview Christoph Lameter
2004-12-23 19:29 ` Prezeroing V2 [0/3]: Why and When it works Christoph Lameter
2004-12-23 19:33 ` Prezeroing V2 [1/4]: __GFP_ZERO / clear_page() removal Christoph Lameter
2004-12-23 19:34 ` Prezeroing V2 [3/4]: Add support for ZEROED and NOT_ZEROED free maps Christoph Lameter
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