Re: [PATCH, RFC] shmat: introduce flag SHM_MAP_HINT

Kirill A. Shutemov
2008-10-07T11:23:14Z

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On Tue, Oct 07, 2008 at 08:08:19PM +0900, KOSAKI Motohiro wrote:
> > It allows interpret attach address as a hint, not as exact address.
> >
> > Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> > Cc: Andi Kleen <andi@firstfloor.org>
> > Cc: Ingo Molnar <mingo@redhat.com>
> > Cc: Arjan van de Ven <arjan@infradead.org>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > ---
> > include/linux/shm.h | 1 +
> > ipc/shm.c | 4 ++--
> > 2 files changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/shm.h b/include/linux/shm.h
> > index eca6235..2a637b8 100644
> > --- a/include/linux/shm.h
> > +++ b/include/linux/shm.h
> > @@ -55,6 +55,7 @@ struct shmid_ds {
> > #define SHM_RND 020000 /* round attach address to SHMLBA boundary */
> > #define SHM_REMAP 040000 /* take-over region on attach */
> > #define SHM_EXEC 0100000 /* execution access */
> > +#define SHM_MAP_HINT 0200000 /* interpret attach address as a hint */
>
> hmm..
> Honestly, I don't like that qemu specific feature insert into shmem core.
> At least, this patch is too few comments.
> Therefore, an develpper can't understand why SHM_MAP_HINT exist.
>
> I think this patch description is too short and too poor.
> I don't like increasing mysterious interface.

Sorry for it. I'll fix it in next patch version.

--
Regards, Kirill A. Shutemov
+ Belarus, Minsk
+ ALT Linux Team, http://www.altlinux.com/

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