linux-kernel - Re: [PATCH 1/2] proc: report file/anon bit in /proc/pid/pagemap

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Message-ID: <4F9CFBB4.2080708@openvz.org>
Date:	Sun, 29 Apr 2012 12:28:36 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
CC:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: [PATCH 1/2] proc: report file/anon bit in /proc/pid/pagemap

KOSAKI Motohiro wrote:
>> diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
>> index 4600cbe..7587493 100644
>> --- a/Documentation/vm/pagemap.txt
>> +++ b/Documentation/vm/pagemap.txt
>> @@ -16,7 +16,7 @@ There are three components to pagemap:
>>      * Bits 0-4   swap type if swapped
>>      * Bits 5-54  swap offset if swapped
>>      * Bits 55-60 page shift (page size = 1<<page shift)
>> -    * Bit  61    reserved for future use
>> +    * Bit  61    page is file-page or shared-anon
>>      * Bit  62    page swapped
>>      * Bit  63    page present
>
> hmm..
> Here says, file or shmem.
>
>
>> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
>> index 2d60492..bc3df31 100644
>> --- a/fs/proc/task_mmu.c
>> +++ b/fs/proc/task_mmu.c
>> @@ -700,6 +700,7 @@ struct pagemapread {
>>
>>   #define PM_PRESENT          PM_STATUS(4LL)
>>   #define PM_SWAP             PM_STATUS(2LL)
>> +#define PM_FILE             PM_STATUS(1LL)
>>   #define PM_NOT_PRESENT      PM_PSHIFT(PAGE_SHIFT)
>>   #define PM_END_OF_BUFFER    1
>
> But, this macro says it's file. it seems a bit misleading. ;-)

well... you know, shmem/shared-anon actually lays on tmpfs. so they really file-pages.

>
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