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From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: mtk.manpages@gmail.com, Vlastimil Babka <vbabka@suse.cz>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	linux-man <linux-man@vger.kernel.org>,
	Hugh Dickins <hughd@google.com>
Subject: Re: MADV_DONTNEED semantics? Was: [RFC PATCH] mm: madvise: Ignore repeated MADV_DONTNEED hints
Date: Mon, 09 Feb 2015 10:13:07 +0100	[thread overview]
Message-ID: <54D87A23.40703@gmail.com> (raw)
In-Reply-To: <20150209064600.GA32300@blaptop>

Hello Minchan

On 02/09/2015 07:46 AM, Minchan Kim wrote:
> Hello, Michael
> 
> On Fri, Feb 06, 2015 at 04:41:12PM +0100, Michael Kerrisk (man-pages) wrote:
>> On 02/05/2015 02:07 AM, Minchan Kim wrote:
>>> Hello,
>>>
>>> On Wed, Feb 04, 2015 at 08:24:27PM +0100, Michael Kerrisk (man-pages) wrote:
>>>> On 4 February 2015 at 18:02, Vlastimil Babka <vbabka@suse.cz> wrote:
>>>>> On 02/04/2015 03:00 PM, Michael Kerrisk (man-pages) wrote:

[...]

>>> And we should make error section, too.
>>> "locked" covers mlock(2) and you said you will add hugetlb. Then,
>>> VM_PFNMAP? In that case, it fails. How can we say about VM_PFNMAP?
>>> special mapping for some drivers?
>>
>> I'm open for offers on what to add.
> 
> I suggests from quote "LWN" http://lwn.net/Articles/162860/
> "*special mapping* which is not made up of "normal" pages.
> It is usually created by device drivers which map special memory areas
> into user space"

Thanks. I've added mention of VM_PFNMAP in the discussion of both 
MADV_DONTNEED and MADV_REMOVE, and noted that both of those
operations will give an error when applied to VM_PFNMAP pages.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

  reply	other threads:[~2015-02-09  9:13 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-02 16:55 Mel Gorman
2015-02-02 22:05 ` Andrew Morton
2015-02-02 22:18   ` Mel Gorman
2015-02-02 22:35     ` Andrew Morton
2015-02-03  0:26       ` Davidlohr Bueso
2015-02-03 10:50       ` Mel Gorman
2015-02-05 21:44     ` Rik van Riel
2015-02-02 22:22 ` Dave Hansen
2015-02-03  8:19   ` MADV_DONTNEED semantics? Was: " Vlastimil Babka
2015-02-03 10:53     ` Kirill A. Shutemov
2015-02-03 11:42       ` Vlastimil Babka
2015-02-03 16:20         ` Michael Kerrisk (man-pages)
2015-02-04 13:46           ` Vlastimil Babka
2015-02-04 14:00             ` Michael Kerrisk (man-pages)
2015-02-04 17:02               ` Vlastimil Babka
2015-02-04 19:24                 ` Michael Kerrisk (man-pages)
2015-02-05  1:07                   ` Minchan Kim
2015-02-06 15:41                     ` Michael Kerrisk (man-pages)
2015-02-09  6:46                       ` Minchan Kim
2015-02-09  9:13                         ` Michael Kerrisk (man-pages) [this message]
2015-02-05 15:41                   ` Michal Hocko
2015-02-06 15:57                     ` Michael Kerrisk (man-pages)
2015-02-06 20:45                       ` Michal Hocko
2015-02-09  6:50                       ` Minchan Kim
2015-02-04  0:09         ` Minchan Kim
2015-02-03 11:16     ` Mel Gorman
2015-02-03 15:21       ` Michal Hocko
2015-02-03 16:25         ` Michael Kerrisk (man-pages)
2015-02-03  9:47   ` Mel Gorman
2015-02-03 10:47     ` Kirill A. Shutemov
2015-02-03 11:21       ` Mel Gorman

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