From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
David Rientjes <rientjes@google.com>,
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 09/11] thp: lazy huge zero page allocation
Date: Wed, 12 Dec 2012 13:48:04 -0800 [thread overview]
Message-ID: <50C8FB94.6050209@linux.intel.com> (raw)
In-Reply-To: <20121212133051.6dad3722.akpm@linux-foundation.org>
On 12/12/2012 01:30 PM, Andrew Morton wrote:
>>
>> I can rewrite the check to static_key if you want. Would it be better?
>
> The new test-n-branch only happens on the first read fault against a
> thp huge page, yes? In which case it's a quite infrequent event and I
> suspect this isn't worth bothering about.
>
Not to mention that flipping the static key is *incredibly* expensive.
-hpa
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next prev parent reply other threads:[~2012-12-12 21:48 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 [this message]
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
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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