From: Rik van Riel <riel@redhat.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>,
Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>,
Izik Eidus <ieidus@redhat.com>,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Nick Piggin <npiggin@suse.de>, Mel Gorman <mel@csn.ul.ie>,
Andi Kleen <andi@firstfloor.org>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Chris Wright <chrisw@sous-sol.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 00 of 30] Transparent Hugepage support #3
Date: Mon, 25 Jan 2010 19:52:16 -0500 [thread overview]
Message-ID: <4B5E3CC0.2060006@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1001251529070.5379@router.home>
On 01/25/2010 04:50 PM, Christoph Lameter wrote:
> So its not possible to use these "huge" pages in a useful way inside of
> the kernel. They are volatile and temporary.
> In short they cannot be treated as 2M entities unless we add some logic to
> prevent splitting.
>
> Frankly this seems to be adding splitting that cannot be used if one
> really wants to use large pages for something.
What exactly do you need the stable huge pages for?
Do you have anything specific in mind that we should take
into account?
Want to send in an incremental patch that can temporarily block
the pageout code from splitting up a huge page, so your direct
users of huge pages can rely on them sticking around until the
transaction is done?
> I still think we should get transparent huge page support straight up
> first without complicated fallback schemes that makes huge pages difficult
> to use.
Without swapping, they will become difficult to use for system
administrators, at least in the workloads we care about.
I understand that your workloads may be different.
Please tell us what you need, instead of focussing on what you
don't want, and we may be able to keep the code in such a shape
that you can easily add your functionality.
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next prev parent reply other threads:[~2010-01-26 0:53 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 6:20 [PATCH 00 of 30] Transparent Hugepage support #3 Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 01 of 30] define MADV_HUGEPAGE Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 02 of 30] compound_lock Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 03 of 30] alter compound get_page/put_page Andrea Arcangeli
2010-01-21 17:35 ` Dave Hansen
2010-01-23 17:39 ` Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 04 of 30] clear compound mapping Andrea Arcangeli
2010-01-21 17:43 ` Dave Hansen
2010-01-23 17:55 ` Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 05 of 30] add native_set_pmd_at Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 06 of 30] add pmd paravirt ops Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 07 of 30] no paravirt version of pmd ops Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 08 of 30] export maybe_mkwrite Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 09 of 30] comment reminder in destroy_compound_page Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 10 of 30] config_transparent_hugepage Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 11 of 30] add pmd mangling functions to x86 Andrea Arcangeli
2010-01-21 17:47 ` Dave Hansen
2010-01-21 19:14 ` Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 12 of 30] add pmd mangling generic functions Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 13 of 30] special pmd_trans_* functions Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 14 of 30] bail out gup_fast on splitting pmd Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 15 of 30] pte alloc trans splitting Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 16 of 30] add pmd mmu_notifier helpers Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 17 of 30] clear page compound Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 18 of 30] add pmd_huge_pte to mm_struct Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 19 of 30] ensure mapcount is taken on head pages Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 20 of 30] split_huge_page_mm/vma Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 21 of 30] split_huge_page paging Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 22 of 30] pmd_trans_huge migrate bugcheck Andrea Arcangeli
2010-01-21 20:40 ` Christoph Lameter
2010-01-21 23:01 ` Andrea Arcangeli
2010-01-21 23:17 ` Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 23 of 30] clear_copy_huge_page Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 24 of 30] kvm mmu transparent hugepage support Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 25 of 30] transparent hugepage core Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 26 of 30] madvise(MADV_HUGEPAGE) Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 27 of 30] memcg compound Andrea Arcangeli
2010-01-21 7:07 ` KAMEZAWA Hiroyuki
2010-01-21 15:44 ` Andrea Arcangeli
2010-01-21 23:55 ` KAMEZAWA Hiroyuki
2010-01-21 6:20 ` [PATCH 28 of 30] memcg huge memory Andrea Arcangeli
2010-01-21 7:16 ` KAMEZAWA Hiroyuki
2010-01-21 16:08 ` Andrea Arcangeli
2010-01-22 0:13 ` KAMEZAWA Hiroyuki
2010-01-27 11:27 ` Balbir Singh
2010-01-28 0:50 ` Daisuke Nishimura
2010-01-28 11:39 ` Andrea Arcangeli
2010-01-28 12:23 ` Balbir Singh
2010-01-28 12:36 ` Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 29 of 30] transparent hugepage vmstat Andrea Arcangeli
2010-01-21 6:20 ` [PATCH 30 of 30] khugepaged Andrea Arcangeli
2010-01-22 14:46 ` [PATCH 00 of 30] Transparent Hugepage support #3 Christoph Lameter
2010-01-22 15:19 ` Andrea Arcangeli
2010-01-22 16:51 ` Christoph Lameter
2010-01-23 17:58 ` Andrea Arcangeli
2010-01-25 21:50 ` Christoph Lameter
2010-01-25 22:46 ` Andrea Arcangeli
2010-01-26 15:47 ` Christoph Lameter
2010-01-26 16:11 ` Andrea Arcangeli
2010-01-26 16:30 ` Christoph Lameter
2010-01-26 16:45 ` Andrea Arcangeli
2010-01-26 18:23 ` Christoph Lameter
2010-01-26 17:09 ` Avi Kivity
2010-01-26 0:52 ` Rik van Riel [this message]
2010-01-26 6:53 ` Gleb Natapov
2010-01-26 12:35 ` Andrea Arcangeli
2010-01-26 15:55 ` Christoph Lameter
2010-01-26 16:19 ` Andrea Arcangeli
2010-01-26 15:54 ` Christoph Lameter
2010-01-26 16:16 ` Andrea Arcangeli
2010-01-26 16:24 ` Andi Kleen
2010-01-26 16:37 ` Christoph Lameter
2010-01-26 16:42 ` Mel Gorman
2010-01-26 16:52 ` Andrea Arcangeli
2010-01-26 17:26 ` Mel Gorman
2010-01-26 19:46 ` Andrea Arcangeli
2010-01-26 23:07 ` Rik van Riel
2010-01-27 18:33 ` Christoph Lameter
2010-01-26 11:24 ` Mel Gorman
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