From: "H. Peter Anvin" <hpa@linux.intel.com>
To: David Rientjes <rientjes@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org, Andi Kleen <ak@linux.intel.com>,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH v5 11/11] thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events
Date: Fri, 16 Nov 2012 13:29:03 -0800 [thread overview]
Message-ID: <50A6B01F.3000708@linux.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1211141541000.22537@chino.kir.corp.google.com>
On 11/14/2012 03:41 PM, David Rientjes wrote:
>
> Nobody is going to know what hzp_ is, sorry. It's better to be more
> verbose and name them what they actually are: THP_ZERO_PAGE_ALLOC and
> THP_ZERO_PAGE_ALLOC_FAILED. But this would assume we want to lazily
> allocate them, which I disagree with hpa about.
>
You want to permanently sit on 2 MiB of memory on all systems? That
being an obvious nonstarter, then you end up having to make some kind of
static control, with all the problems that entails (if Linus had not set
his foot down on tunables a long time ago, we today would have had a
Linux mm which only performed well if you manually set hundreds or
thousands of parameters) you either have lazy allocation or you go with
the virtual huge zero page solution and just accept that either is going
to perform poorly under some set of pathological circumstances.
-hpa
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next prev parent reply other threads:[~2012-11-16 21:29 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 15:00 [PATCH v5 00/11] Introduce huge zero page Kirill A. Shutemov
2012-11-07 15:00 ` [PATCH v5 01/11] thp: huge zero page: basic preparation Kirill A. Shutemov
2012-11-14 22:09 ` David Rientjes
2012-11-07 15:00 ` [PATCH v5 02/11] thp: zap_huge_pmd(): zap huge zero pmd Kirill A. Shutemov
2012-11-14 22:18 ` David Rientjes
2012-11-07 15:00 ` [PATCH v5 03/11] thp: copy_huge_pmd(): copy huge zero page Kirill A. Shutemov
2012-11-14 22:33 ` David Rientjes
2012-11-15 8:01 ` Kirill A. Shutemov
2012-11-15 8:14 ` David Rientjes
2012-11-07 15:00 ` [PATCH v5 04/11] thp: do_huge_pmd_wp_page(): handle " Kirill A. Shutemov
2012-11-14 23:08 ` David Rientjes
2012-11-15 8:29 ` Kirill A. Shutemov
2012-11-07 15:00 ` [PATCH v5 05/11] thp: change_huge_pmd(): keep huge zero page write-protected Kirill A. Shutemov
2012-11-14 23:12 ` David Rientjes
2012-11-15 8:46 ` Kirill A. Shutemov
2012-11-15 21:47 ` David Rientjes
2012-11-16 18:13 ` Kirill A. Shutemov
2012-11-16 20:10 ` David Rientjes
2012-11-20 16:00 ` Kirill A. Shutemov
2012-12-03 9:53 ` Kirill A. Shutemov
2012-11-07 15:00 ` [PATCH v5 06/11] thp: change split_huge_page_pmd() interface Kirill A. Shutemov
2012-11-14 23:22 ` David Rientjes
2012-11-15 8:52 ` Kirill A. Shutemov
2012-11-07 15:00 ` [PATCH v5 07/11] thp: implement splitting pmd for huge zero page Kirill A. Shutemov
2012-11-14 23:28 ` David Rientjes
2012-11-15 9:24 ` Kirill A. Shutemov
2012-11-07 15:01 ` [PATCH v5 08/11] thp: setup huge zero page on non-write page fault Kirill A. Shutemov
2012-11-14 23:33 ` David Rientjes
2012-11-15 9:32 ` Kirill A. Shutemov
2012-11-15 21:52 ` David Rientjes
2012-11-16 18:20 ` Kirill A. Shutemov
2012-11-07 15:01 ` [PATCH v5 09/11] thp: lazy huge zero page allocation Kirill A. Shutemov
2012-11-14 23:37 ` David Rientjes
2012-11-15 9:41 ` Kirill A. Shutemov
2012-12-12 21:30 ` Andrew Morton
2012-12-12 21:48 ` H. Peter Anvin
2012-12-12 22:05 ` Kirill A. Shutemov
2012-11-07 15:01 ` [PATCH v5 10/11] thp: implement refcounting for huge zero page Kirill A. Shutemov
2012-11-14 23:40 ` David Rientjes
2012-11-15 9:50 ` Kirill A. Shutemov
2012-11-07 15:01 ` [PATCH v5 11/11] thp, vmstat: implement HZP_ALLOC and HZP_ALLOC_FAILED events Kirill A. Shutemov
2012-11-14 23:41 ` David Rientjes
2012-11-16 21:29 ` H. Peter Anvin [this message]
2012-11-14 21:33 ` [PATCH v5 00/11] Introduce huge zero page Andrew Morton
2012-11-14 23:20 ` Alan Cox
2012-11-14 23:32 ` Andrew Morton
2012-11-14 23:51 ` H. Peter Anvin
2012-11-15 0:29 ` David Rientjes
2012-11-15 7:29 ` Kirill A. Shutemov
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