> On 03/08/2011 06:32 AM, Andrea Arcangeli wrote: > > > Subject: thp: fix page_referenced to modify mapcount/vm_flags only if page is found > > > > From: Andrea Arcangeli<aarcange@xxxxxxxxxx> > > > > When vmscan.c calls page_referenced, if an anon page was created before a > > process forked, rmap will search for it in both of the processes, even though > > one of them might have since broken COW. If the child process mlocks the vma > > where the COWed page belongs to, page_referenced() running on the page mapped > > by the parent would lead to *vm_flags getting VM_LOCKED set erroneously (leading > > to the references on the parent page being ignored and evicting the parent page > > too early). > > > Signed-off-by: Andrea Arcangeli<aarcange@xxxxxxxxxx> > > Reported-by: Michel Lespinasse<walken@xxxxxxxxxx> > > Reviewed-by: Rik van Riel<riel@xxxxxxxxxx> Thank you, Andrea. Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>