From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: [PATCH][RFC] add MAP_UNLOCKED mmap flag Date: Tue, 6 Oct 2009 13:00:00 +0200 Message-ID: <20091006110000.GJ9832@redhat.com> References: <20091006095111.GG9832@redhat.com> <200910061249.53030.arnd@arndb.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <200910061249.53030.arnd@arndb.de> Sender: owner-linux-mm@kvack.org To: Arnd Bergmann 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 12:49:52PM +0200, Arnd Bergmann wrote: > On Tuesday 06 October 2009, Gleb Natapov wrote: > > If application does mlockall(MCL_FUTURE) it is no longer possible to > > mmap file bigger than main memory or allocate big area of anonymous > > memory. Sometimes it is desirable to lock everything related to program > > execution into memory, but still be able to mmap big file or allocate > > huge amount of memory and allow OS to swap them on demand. MAP_UNLOCKED > > allows to do that. > > > > Signed-off-by: Gleb Natapov > > diff --git a/include/asm-generic/mman.h b/include/asm-generic/mman.h > > index 32c8bd6..0ab4c74 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_UNLOKED 0x80000 /* pages are unlocked */ > > > > #define MCL_CURRENT 1 /* lock all current mappings */ > > #define MCL_FUTURE 2 /* lock all future mappings */ > > Not all architectures use asm-generic/mman.h, so you have to change > the other architectures separately if you add a flag. > Ah, good to know. Thanks. -- 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