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

[Konstantin Khlebnikov]

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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