Messages in this thread Patch in this message |  | | Date | Fri, 30 May 2003 16:34:15 -0700 | From | "Paul E. McKenney" <> | Subject | [PATCH] vm_operation to avoid pagefault/inval race |
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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 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/
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