linux-kernel - Re: [RFC PATCH 3/3] mm: shm: Use new hugetlb size encoding definitions

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Date:   Wed, 26 Jul 2017 12:07:18 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        akpm@...ux-foundation.org, ak@...ux.intel.com,
        mtk.manpages@...il.com, Davidlohr Bueso <dbueso@...e.de>,
        khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
        aarcange@...hat.com
Subject: Re: [RFC PATCH 3/3] mm: shm: Use new hugetlb size encoding
 definitions

On Wed 26-07-17 11:53:38, Michal Hocko wrote:
> On Mon 17-07-17 15:28:01, Mike Kravetz wrote:
> > Use the common definitions from hugetlb_encode.h header file for
> > encoding hugetlb size definitions in shmget system call flags.  In
> > addition, move these definitions to the from the internal to user
> > (uapi) header file.
> 
> s@to the from@...m@
> 
> > 
> > Suggested-by: Matthew Wilcox <willy@...radead.org>
> > Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
> 
> with s@...ETLB_FLAG_ENCODE__16GB@...ETLB_FLAG_ENCODE_16GB@
> 
> Acked-by: Michal Hocko <mhocko@...e.com>

Btw. man page mentions only 2MB and 1GB, we should document others and
note that each arch might support only subset of them

> > +#define MAP_HUGE_512KB	HUGETLB_FLAG_ENCODE_512KB
> > +#define MAP_HUGE_1MB	HUGETLB_FLAG_ENCODE_1MB
> > +#define MAP_HUGE_2MB	HUGETLB_FLAG_ENCODE_2MB
> > +#define MAP_HUGE_8MB	HUGETLB_FLAG_ENCODE_8MB
> > +#define MAP_HUGE_16MB	HUGETLB_FLAG_ENCODE_16MB
> > +#define MAP_HUGE_1GB	HUGETLB_FLAG_ENCODE_1GB
> > +#define MAP_HUGE_16GB	HUGETLB_FLAG_ENCODE__16GB
-- 
Michal Hocko
SUSE Labs