From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: [PATCH v2][RFC] add MAP_UNLOCKED mmap flag Date: Tue, 6 Oct 2009 20:53:44 +0200 Message-ID: <20091006185344.GA19692@redhat.com> References: <20091006170218.GM9832@redhat.com> <20091006183436.GA23110@cmpxchg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20091006183436.GA23110@cmpxchg.org> Sender: owner-linux-mm@kvack.org To: Johannes Weiner Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org List-Id: linux-api@vger.kernel.org On Tue, Oct 06, 2009 at 08:34:36PM +0200, Johannes Weiner wrote: > On Tue, Oct 06, 2009 at 07:02:18PM +0200, Gleb Natapov wrote: > > diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h > > index 32c8bd6..59e0f29 100644 > > --- a/include/asm-generic/mman.h > > +++ b/include/asm-generic/mman.h > > @@ -12,6 +12,7 @@ > > #define MAP_NONBLOCK 0x10000 /* do not block on IO */ > > #define MAP_STACK 0x20000 /* give out an address that is best suited for process/thread stacks */ > > #define MAP_HUGETLB 0x40000 /* create a huge page mapping */ > > +#define MAP_UNLOCKED 0x80000 /* force page unlocking */ > > > > #define MCL_CURRENT 1 /* lock all current mappings */ > > #define MCL_FUTURE 2 /* lock all future mappings */ > > diff --git a/mm/mmap.c b/mm/mmap.c > > index 73f5e4b..7c2abdb 100644 > > --- a/mm/mmap.c > > +++ b/mm/mmap.c > > @@ -985,6 +985,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, > > if (!can_do_mlock()) > > return -EPERM; > > > > + if (flags & MAP_UNLOKED) > > + vm_flags &= ~VM_LOCKED; > > That needs changing into MAP_UNLOCKED as well. > That's for editing patch manually :( > Should we do something special about (MAP_UNLOCKED | MAP_LOCKED)? It is simpler to just ignore it. What do you think? -- Gleb. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org