From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
Cc: Christoph Lameter <clameter@sgi.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, ak@suse.de
Subject: Re: [QUICKLIST 1/4] Quicklists for page table pages V5
Date: Wed, 11 Apr 2007 16:15:24 +1000 [thread overview]
Message-ID: <1176272125.8061.93.camel@localhost.localdomain> (raw)
In-Reply-To: <17948.29982.857777.776522@cargo.ozlabs.ibm.com>
On Wed, 2007-04-11 at 15:41 +1000, Paul Mackerras wrote:
> Benjamin Herrenschmidt writes:
>
> > > > For a 64K page size kernel, we have 3 level page tables and we use 3
> > > > caches: a PGD pages are 128 bytes (yeah, not big heh...), our pmd
> > > > pages are 32K (half a page) and PTE pages are PAGE_SIZE (64K).
> > >
> > > Ok so use quicklists for the PTEs and slab for the rest? A PGD of only 128
> > > bytes? Stuff one at the end of the mm_struct or the task struct? That way
> > > you can avoid allocation overhead.
> >
> > Yeah, maybe... I need to think about it a bit more. I might be able to
> > make the PMD a full page too.
>
> There was a reason for making the PMD level map 256MB. I'd have to
> remember what that was and make sure it didn't apply any more first...
For dynamic VSIDs....
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
Cc: Christoph Lameter <clameter@sgi.com>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, ak@suse.de
Subject: Re: [QUICKLIST 1/4] Quicklists for page table pages V5
Date: Wed, 11 Apr 2007 16:15:24 +1000 [thread overview]
Message-ID: <1176272125.8061.93.camel@localhost.localdomain> (raw)
In-Reply-To: <17948.29982.857777.776522@cargo.ozlabs.ibm.com>
On Wed, 2007-04-11 at 15:41 +1000, Paul Mackerras wrote:
> Benjamin Herrenschmidt writes:
>
> > > > For a 64K page size kernel, we have 3 level page tables and we use 3
> > > > caches: a PGD pages are 128 bytes (yeah, not big heh...), our pmd
> > > > pages are 32K (half a page) and PTE pages are PAGE_SIZE (64K).
> > >
> > > Ok so use quicklists for the PTEs and slab for the rest? A PGD of only 128
> > > bytes? Stuff one at the end of the mm_struct or the task struct? That way
> > > you can avoid allocation overhead.
> >
> > Yeah, maybe... I need to think about it a bit more. I might be able to
> > make the PMD a full page too.
>
> There was a reason for making the PMD level map 256MB. I'd have to
> remember what that was and make sure it didn't apply any more first...
For dynamic VSIDs....
Ben.
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next prev parent reply other threads:[~2007-04-11 6:15 UTC|newest]
Thread overview: 48+ 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 ` Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 2/4] Quicklist support for IA64 Christoph Lameter
2007-04-09 18:25 ` Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 3/4] Quicklist support for x86_64 Christoph Lameter
2007-04-09 18:25 ` Christoph Lameter
2007-04-09 18:43 ` Andi Kleen
2007-04-09 18:43 ` Andi Kleen
2007-04-09 18:46 ` Christoph Lameter
2007-04-09 18:46 ` Christoph Lameter
2007-04-09 18:49 ` Andi Kleen
2007-04-09 18:49 ` Andi Kleen
2007-04-09 18:51 ` Christoph Lameter
2007-04-09 18:51 ` Christoph Lameter
2007-04-09 18:53 ` Andi Kleen
2007-04-09 18:53 ` Andi Kleen
2007-04-09 18:56 ` Christoph Lameter
2007-04-09 18:56 ` Christoph Lameter
2007-04-09 21:28 ` Andrew Morton
2007-04-09 21:28 ` Andrew Morton
2007-04-09 22:01 ` Christoph Lameter
2007-04-09 22:01 ` Christoph Lameter
2007-04-09 18:25 ` [QUICKLIST 4/4] Quicklist support for sparc64 Christoph Lameter
2007-04-09 18:25 ` Christoph Lameter, David Miller
2007-04-09 18:48 ` [QUICKLIST 1/4] Quicklists for page table pages V5 Andrew Morton
2007-04-09 18:48 ` Andrew Morton
2007-04-09 18:50 ` Christoph Lameter
2007-04-09 18:50 ` Christoph Lameter
2007-04-09 21:27 ` Andrew Morton
2007-04-09 21:27 ` Andrew Morton
2007-04-09 21:41 ` Andrew Morton
2007-04-09 21:41 ` Andrew Morton
2007-04-09 22:03 ` Christoph Lameter
2007-04-09 22:03 ` Christoph Lameter
2007-04-10 0:26 ` William Lee Irwin III
2007-04-10 0:26 ` William Lee Irwin III
2007-04-10 0:53 ` Christoph Lameter
2007-04-10 0:53 ` Christoph Lameter
2007-04-10 4:45 ` Benjamin Herrenschmidt
2007-04-10 4:45 ` Benjamin Herrenschmidt
2007-04-11 4:04 ` Christoph Lameter
2007-04-11 4:04 ` Christoph Lameter
2007-04-11 4:18 ` Benjamin Herrenschmidt
2007-04-11 4:18 ` Benjamin Herrenschmidt
2007-04-11 5:41 ` Paul Mackerras
2007-04-11 5:41 ` Paul Mackerras
2007-04-11 6:15 ` Benjamin Herrenschmidt [this message]
2007-04-11 6:15 ` Benjamin Herrenschmidt
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