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;
}