From: David Miller <davem@davemloft.net>
From: Matt Mackall <mpm@selenic.com>
To: mpm@selenic.com
Cc: jeremy@goop.org, nickpiggin@yahoo.com.au,
akpm@linux-foundation.org, clameter@sgi.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 0/4] Arch independent quicklists V2
Date: Tue, 13 Mar 2007 14:07:22 -0700 (PDT) [thread overview]
Date: Tue, 13 Mar 2007 15:21:25 -0500 [thread overview]
Message-ID: <20070313.140722.72711732.davem@davemloft.net> (raw)
In-Reply-To: <20070313202125.GO10394@waste.org>
> Because the fan-out is large, the bulk of the work is bringing the last
> layer of the tree into cache to find all the pages in the address
> space. And there's really no way around that.
That's right.
And I will note that historically we used to be much worse
in this area, as we used to walk the page table tree twice
on address space teardown (once to hit the PTE entries, once
to free the page tables).
Happily it is a one-pass algorithm now.
But, within active VMA ranges, we do have to walk all
the bits at least one time.
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next prev parent reply other threads:[~2007-03-13 21:07 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070313071325.4920.82870.sendpatchset@schroedinger.engr.sgi.com>
[not found] ` <20070313005334.853559ca.akpm@linux-foundation.org>
[not found] ` <45F65ADA.9010501@yahoo.com.au>
[not found] ` <20070313035250.f908a50e.akpm@linux-foundation.org>
2007-03-13 11:06 ` Nick Piggin
2007-03-13 12:15 ` Andrew Morton
2007-03-13 11:20 ` Christoph Lameter
2007-03-13 12:30 ` Andrew Morton
2007-03-15 20:23 ` Christoph Lameter
2007-03-13 11:30 ` Nick Piggin
2007-03-13 12:47 ` Andrew Morton
2007-03-13 12:01 ` Nick Piggin
2007-03-13 13:11 ` Andrew Morton
2007-03-13 12:18 ` Nick Piggin
2007-03-13 17:30 ` Jeremy Fitzhardinge
2007-03-13 20:03 ` Matt Mackall
2007-03-13 20:17 ` Jeremy Fitzhardinge
2007-03-13 20:21 ` Matt Mackall
2007-03-13 21:07 ` David Miller, Matt Mackall [this message]
2007-03-13 21:14 ` Matt Mackall
2007-03-13 21:36 ` Jeremy Fitzhardinge
2007-03-13 21:46 ` Peter Chubb
2007-03-13 21:48 ` David Miller, Matt Mackall
2007-03-14 1:12 ` William Lee Irwin III
2007-03-15 23:12 ` William Lee Irwin III
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