From: Christoph Lameter <clameter@sgi.com>
To: Andi Kleen <ak@suse.de>
Cc: akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [QUICKLIST 3/4] Quicklist support for x86_64
Date: Mon, 9 Apr 2007 11:56:39 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0704091153480.8986@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <200704092053.05590.ak@suse.de>
On Mon, 9 Apr 2007, Andi Kleen wrote:
> > Otherwise you will leak pages to the page allocator before the tlb flush
> > occurred.
>
> I don't get it sorry. Can you please explain in more detail?
On process teardown pages are freed via the tlb mechanism. That mechanism
guarantees that TLBs for pages are flushed before they can be reused. We
tie into that and put pages on quicklists. The quicklists are trimmed
after the TLB flush.
If a shrinker would indepedently free pages from the quicklists then this
mechanism would no longer work and pages that still have a valid TLB for
one process may be reused by other processes.
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next prev parent reply other threads:[~2007-04-09 18:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-09 18:25 [QUICKLIST 1/4] Quicklists for page table pages V5 Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 2/4] Quicklist support for IA64 Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 3/4] Quicklist support for x86_64 Christoph Lameter
2007-04-09 18:43 ` Andi Kleen
2007-04-09 18:46 ` Christoph Lameter
2007-04-09 18:49 ` Andi Kleen
2007-04-09 18:51 ` Christoph Lameter
2007-04-09 18:53 ` Andi Kleen
2007-04-09 18:56 ` Christoph Lameter [this message]
2007-04-09 21:28 ` Andrew Morton
2007-04-09 22:01 ` Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 4/4] Quicklist support for sparc64 Christoph Lameter, David Miller
2007-04-09 18:48 ` [QUICKLIST 1/4] Quicklists for page table pages V5 Andrew Morton
2007-04-09 18:50 ` Christoph Lameter
2007-04-09 21:27 ` Andrew Morton
2007-04-09 21:41 ` Andrew Morton
2007-04-09 22:03 ` Christoph Lameter
2007-04-10 0:26 ` William Lee Irwin III
2007-04-10 0:53 ` Christoph Lameter
2007-04-10 4:45 ` Benjamin Herrenschmidt
2007-04-11 4:04 ` Christoph Lameter
2007-04-11 4:18 ` Benjamin Herrenschmidt
2007-04-11 5:41 ` Paul Mackerras
2007-04-11 6:15 ` Benjamin Herrenschmidt
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