linux-kernel - Re: [PATCH] arch: uapi: asm: mman.h: Support MADV

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Date:	Tue, 02 Dec 2014 10:07:33 +0800
From:	Chen Gang <gang.chen.5i5j@...il.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Carlos O'Donell <carlos@...temhalted.org>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Max Filippov <jcmvbkbc@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"rth@...ddle.net" <rth@...ddle.net>,
	"ink@...assic.park.msu.ru" <ink@...assic.park.msu.ru>,
	"mattst88@...il.com" <mattst88@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"jejb@...isc-linux.org" <jejb@...isc-linux.org>,
	"deller@....de" <deller@....de>,
	"chris@...kel.net" <chris@...kel.net>,
	"linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arch: uapi: asm: mman.h: Support MADV_FREE for madvise()

On 12/2/14 09:55, James Bottomley wrote:
> On Mon, 2014-12-01 at 17:01 -0500, Carlos O'Donell wrote:
>> On Mon, Dec 1, 2014 at 4:35 PM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>>> On Mon, Dec 1, 2014 at 9:52 PM, Max Filippov <jcmvbkbc@...il.com> wrote:
>>>> On Mon, Dec 1, 2014 at 11:43 PM, Chen Gang <gang.chen.5i5j@...il.com> wrote:
>>>>> At present, kernel supports madvise(MADV_FREE), so can benefit to all
>>>>> related architectures (can grep MADV_WILLNEED or MADV_REMOVE in "arch/"
>>>>> to know about all related architectures).
>>>>
>>>> A similar patch has been posted a while ago:
>>>>
>>>> http://www.spinics.net/lists/linux-mm/msg81538.html
>>>
>>> Would it be possible to use the same number everywhere?
>>
>> Yes please. It's ridiculous that we still need patches like this.
>>
>> I proposed unifying all this two years ago, but didn't follow up.
>>
>> From glibc's perspective it would be simpler if we started using the
>> same number everywhere.
>>
>> http://www.spinics.net/lists/linux-api/msg02064.html
> 
> Please co-ordinate with Andrew then because he's intent on merging this
> patch:
> 
> http://marc.info/?l=linux-mm-commits&m=141747572930808
> 

For me, we can let MADV_FREE to 8 based on the Andrew's mm tree. Since
it is about uapi, we need try our best to let it perfect.


Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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