From: Andrew Morton <akpm@linux-foundation.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: linux-mm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 1/5] Quicklists for page table pages V3
Date: Mon, 19 Mar 2007 17:07:41 -0700 [thread overview]
Message-ID: <20070319170741.5a24af4c.akpm@linux-foundation.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0703191655190.13879@schroedinger.engr.sgi.com>
On Mon, 19 Mar 2007 16:57:55 -0700 (PDT)
Christoph Lameter <clameter@sgi.com> wrote:
> On Mon, 19 Mar 2007, Andrew Morton wrote:
>
> > Has it been proven that quicklists are superior to simply going direct to the
> > page allocator for these pages?
>
> Yes.
Sigh.
Please provide proof that quicklists are superior to simply going direct to
the page allocator for these pages.
> > Would it provide a superior solution if we were to a) stop zeroing out the
> > pte's when doing a fullmm==1 teardown and b) go direct to the page allocator
> > for these pages?
>
> I doubt it. The zeroing is a by product of our way of serializing pte
> handling. Its going to be difficult to change that.
Nick didn't think so, and I don't see the problem either.
We'll save on some bus traffic by avoiding the writeback, but how much
effect that will have we don't know. Presumably little.
next prev parent reply other threads:[~2007-03-20 0:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-19 23:37 Christoph Lameter
2007-03-19 23:37 ` [QUICKLIST 2/5] Quicklist support for IA64 Christoph Lameter
2007-03-19 23:37 ` [QUICKLIST 3/5] Quicklist support for i386 Christoph Lameter
2007-03-19 23:37 ` [QUICKLIST 4/5] Quicklist support for x86_64 Christoph Lameter
2007-03-19 23:37 ` [QUICKLIST 5/5] Quicklist support for sparc64 Christoph Lameter
2007-03-19 23:53 ` [QUICKLIST 1/5] Quicklists for page table pages V3 Andrew Morton
2007-03-19 23:57 ` Christoph Lameter
2007-03-20 0:07 ` Andrew Morton [this message]
2007-03-20 0:44 ` Christoph Lameter
2007-03-20 0:55 ` Andrew Morton
2007-03-20 1:03 ` Christoph Lameter
2007-03-20 1:32 ` Andrew Morton
2007-03-20 19:41 ` Christoph Lameter
2007-03-19 23:58 ` David Miller
2007-03-20 0:21 ` Andrew Morton
2007-03-20 1:06 ` Christoph Lameter
2007-03-20 3:12 ` Paul Mackerras
2007-03-20 19:43 ` Christoph Lameter
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