From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 30 May 2003 16:34:15 -0700 From: "Paul E. McKenney" Subject: [PATCH] vm_operation to avoid pagefault/inval race Message-ID: <20030530163415.A26729@us.ibm.com> Reply-To: paulmck@us.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org Return-Path: To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@digeo.com, hch@infradead.org List-ID: Rediffed to 2.5.70-mm2. This patch provides one way for a distributed filesystem to avoid the pagefault/cross-node-invalidation race described in: http://marc.theaimsgroup.com/?l=linux-kernel&m=105286345316249&w=2 The advantage of this patch is that it is quite small and quite well tested. A different approach follows in a separate message. Thanx, Paul diff -urN -X dontdiff linux-2.5.70-mm2/include/linux/mm.h linux-2.5.70-mm2.nopagedone/include/linux/mm.h --- linux-2.5.70-mm2/include/linux/mm.h Fri May 30 14:51:05 2003 +++ linux-2.5.70-mm2.nopagedone/include/linux/mm.h Fri May 30 15:11:24 2003 @@ -143,6 +143,7 @@ void (*open)(struct vm_area_struct * area); void (*close)(struct vm_area_struct * area); struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int unused); + void (*nopagedone)(struct vm_area_struct * area, unsigned long address, int status); int (*populate)(struct vm_area_struct * area, unsigned long address, unsigned long len, pgprot_t prot, unsigned long pgoff, int nonblock); }; diff -urN -X dontdiff linux-2.5.70-mm2/mm/memory.c linux-2.5.70-mm2.nopagedone/mm/memory.c --- linux-2.5.70-mm2/mm/memory.c Fri May 30 14:51:06 2003 +++ linux-2.5.70-mm2.nopagedone/mm/memory.c Fri May 30 15:11:24 2003 @@ -1468,6 +1468,9 @@ ret = VM_FAULT_OOM; out: pte_chain_free(pte_chain); + if (vma->vm_ops && vma->vm_ops->nopagedone) { + vma->vm_ops->nopagedone(vma, address & PAGE_MASK, ret); + } return ret; } -- 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: aart@kvack.org