From: Davide Libenzi <davidel@xmailserver.org>
To: Hugh Dickins <hugh@veritas.com>
Cc: Ulrich Drepper <drepper@gmail.com>,
blaisorblade@yahoo.it,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch 2/3] MAP_NOZERO - implement sys_brk2()
Date: Wed, 27 Jun 2007 11:13:52 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0706271111040.32731@alien.or.mcafeemobile.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706271807330.22337@blonde.wat.veritas.com>
On Wed, 27 Jun 2007, Hugh Dickins wrote:
> In honesty, I should add that I dislike and distrust Davide's
> MAP_NOZERO very much indeed! Would much rather leave my cpus
> spending a little time in clear_page(). A uid in struct page
> (though I'm sure we could find somewhere to tuck it away) -
> the horror, the horror! But I've so far failed to find a killer
> argument against it, and am hoping for someone else to do so.
Little time? Please, do not trust me. Start oprofile and run a kernel
build. Look, I'm not even talking about som micro benchmark explicitly
built to exploit the thing. A kernel build.
You will find clear_page to be the *1st* kernel entry after cc1 and as.
That is bad for two reasons. The time it spends in there, and the cache it
blows.
- Davide
next prev parent reply other threads:[~2007-06-27 18:14 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 2:44 [patch 2/3] MAP_NOZERO - implement sys_brk2() Davide Libenzi
2007-06-27 3:07 ` Rik van Riel
2007-06-27 3:33 ` Davide Libenzi
2007-06-27 3:45 ` Ulrich Drepper
2007-06-27 4:11 ` Rik van Riel
2007-06-27 5:04 ` Ulrich Drepper
2007-06-27 3:48 ` Ulrich Drepper
2007-06-27 3:55 ` Davide Libenzi
2007-06-27 5:02 ` Ulrich Drepper
2007-06-27 12:32 ` Hugh Dickins
2007-06-27 15:59 ` Davide Libenzi
2007-06-27 17:01 ` Ulrich Drepper
2007-06-27 17:43 ` Hugh Dickins
2007-06-27 18:13 ` Davide Libenzi [this message]
2007-06-27 18:32 ` Hugh Dickins
2007-06-27 18:45 ` Davide Libenzi
2007-06-27 22:11 ` Nicholas Miell
2007-06-28 0:17 ` Davide Libenzi
2007-06-28 2:58 ` Davide Libenzi
2007-06-30 7:52 ` Andrew Morton
2007-06-27 18:52 ` Ulrich Drepper
2007-06-27 19:32 ` Hugh Dickins
2007-06-27 19:00 ` Rik van Riel
2007-06-27 19:22 ` Davide Libenzi
2007-06-27 16:05 ` Davide Libenzi
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