Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758075AbZC0JfD (ORCPT ); Fri, 27 Mar 2009 05:35:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757162AbZC0Jdl (ORCPT ); Fri, 27 Mar 2009 05:33:41 -0400 Received: from mga02.intel.com ([134.134.136.20]:18096 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757514AbZC0Jdj (ORCPT ); Fri, 27 Mar 2009 05:33:39 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.38,431,1233561600"; d="scan'208";a="501272191" Date: Fri, 27 Mar 2009 09:48:36 +0100 From: Markus Metzger To: linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com, roland@redhat.com, eranian@googlemail.com, oleg@redhat.com, juan.villacis@intel.com, ak@linux.jf.intel.com Subject: [patch 2/14] x86, mm: add release_locked_buffer_on_behalf Message-ID: <20090327094836.A11033@sedona.ch.intel.com> Mime-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.2.5i Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2783 Lines: 78 Allow the release of a locked buffer on behalf of another task. Signed-off-by: Markus Metzger --- Index: git-tip/include/linux/mm.h =================================================================== --- git-tip.orig/include/linux/mm.h 2009-03-23 16:23:19.000000000 +0100 +++ git-tip/include/linux/mm.h 2009-03-23 16:33:03.000000000 +0100 @@ -13,6 +13,7 @@ #include #include #include +#include struct mempolicy; struct anon_vma; @@ -1318,6 +1319,11 @@ void vmemmap_populate_print_last(void); extern void *alloc_locked_buffer(size_t size); extern void free_locked_buffer(void *buffer, size_t size); -extern void release_locked_buffer(void *buffer, size_t size); +extern void release_locked_buffer_on_behalf(struct mm_struct *mm, + void *buffer, size_t size); +static inline void release_locked_buffer(void *buffer, size_t size) +{ + release_locked_buffer_on_behalf(current->mm, buffer, size); +} #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ Index: git-tip/mm/mlock.c =================================================================== --- git-tip.orig/mm/mlock.c 2009-03-23 16:23:19.000000000 +0100 +++ git-tip/mm/mlock.c 2009-03-23 16:24:24.000000000 +0100 @@ -660,16 +660,17 @@ void *alloc_locked_buffer(size_t size) return buffer; } -void release_locked_buffer(void *buffer, size_t size) +void release_locked_buffer_on_behalf(struct mm_struct *mm, + void *buffer, size_t size) { unsigned long pgsz = PAGE_ALIGN(size) >> PAGE_SHIFT; - down_write(¤t->mm->mmap_sem); + down_write(&mm->mmap_sem); - current->mm->total_vm -= pgsz; - current->mm->locked_vm -= pgsz; + mm->total_vm -= pgsz; + mm->locked_vm -= pgsz; - up_write(¤t->mm->mmap_sem); + up_write(&mm->mmap_sem); } void free_locked_buffer(void *buffer, size_t size) --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. -- 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/