From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 4BE806B005A for ; Tue, 6 Oct 2009 06:52:34 -0400 (EDT) From: Arnd Bergmann Subject: Re: [PATCH][RFC] add MAP_UNLOCKED mmap flag Date: Tue, 6 Oct 2009 12:49:52 +0200 References: <20091006095111.GG9832@redhat.com> In-Reply-To: <20091006095111.GG9832@redhat.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200910061249.53030.arnd@arndb.de> Sender: owner-linux-mm@kvack.org To: Gleb Natapov Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org List-ID: 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. Arnd <>< -- 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