From: Brent Casavant <bcasavan@sgi.com>
To: Hugh Dickins <hugh@veritas.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Andrew Morton <akpm@osdl.org>,
linux-mm@kvack.org
Subject: Re: Scaling problem with shmem_sb_info->stat_lock
Date: Thu, 29 Jul 2004 16:51:26 -0500 [thread overview]
Message-ID: <Pine.SGI.4.58.0407291650050.35081@kzerza.americas.sgi.com> (raw)
In-Reply-To: <Pine.SGI.4.58.0407291614150.35081@kzerza.americas.sgi.com>
On Thu, 29 Jul 2004, Brent Casavant wrote:
> On Thu, 29 Jul 2004, Hugh Dickins wrote:
> > Why doesn't the creator of the shm segment or /dev/zero mapping just
> > fault in all the pages before handing over to the other threads?
>
> Performance. The mapping could well range into the tens or hundreds
> of gigabytes, and faulting these pages in parallel would certainly
> be advantageous.
Oh, and let me clarify something. I don't think anyone currently
performs mappings in the hundreds of gigabytes range. But it probably
won't be too many years until that one happens.
But the basic point even at tens of gigabtyes is still valid.
--
Brent Casavant bcasavan@sgi.com Forget bright-eyed and
Operating System Engineer http://www.sgi.com/ bushy-tailed; I'm red-
Silicon Graphics, Inc. 44.8562N 93.1355W 860F eyed and bushy-haired.
--
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next prev parent reply other threads:[~2004-07-29 21:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-12 21:11 Brent Casavant
2004-07-12 21:55 ` William Lee Irwin III
2004-07-12 22:42 ` Brent Casavant
2004-07-13 19:56 ` Brent Casavant
2004-07-13 20:41 ` Hugh Dickins
2004-07-13 21:35 ` Brent Casavant
2004-07-13 22:50 ` William Lee Irwin III
2004-07-13 22:22 ` William Lee Irwin III
2004-07-13 22:27 ` Brent Casavant
2004-07-28 9:26 ` Andrew Morton
2004-07-28 9:59 ` William Lee Irwin III
2004-07-28 22:21 ` Brent Casavant
2004-07-28 23:05 ` Andrew Morton
2004-07-28 23:40 ` Brent Casavant
2004-07-28 23:53 ` William Lee Irwin III
2004-07-28 23:53 ` William Lee Irwin III
2004-07-29 14:54 ` Brent Casavant
2004-07-29 19:58 ` Hugh Dickins
2004-07-29 21:21 ` Brent Casavant
2004-07-29 21:51 ` Brent Casavant [this message]
2004-07-30 1:00 ` William Lee Irwin III
2004-07-30 21:40 ` Brent Casavant
2004-07-30 23:34 ` Paul Jackson
2004-07-31 3:37 ` Ray Bryant
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