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

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Message-ID: <CAHGf_=riWBO6-Ax0hfSU3hhxr7oXwLwtzJC55yeEpZDOjbqREg@mail.gmail.com>
Date:	Sat, 28 Apr 2012 09:32:15 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH 1/2] proc: report file/anon bit in /proc/pid/pagemap

> 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. ;-)
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