Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757095AbZJFLAe (ORCPT ); Tue, 6 Oct 2009 07:00:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755676AbZJFLAd (ORCPT ); Tue, 6 Oct 2009 07:00:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40754 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756598AbZJFLAd (ORCPT ); Tue, 6 Oct 2009 07:00:33 -0400 Date: Tue, 6 Oct 2009 13:00:00 +0200 From: Gleb Natapov To: Arnd Bergmann Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org Subject: Re: [PATCH][RFC] add MAP_UNLOCKED mmap flag 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 Content-Disposition: inline In-Reply-To: <200910061249.53030.arnd@arndb.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1669 Lines: 35 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/