On Thu, Nov 18, 2010 at 11:13:49AM +0000, Mel Gorman wrote: > > This patch fixes the problem by using two VMAs - one which covers the temporary > > stack and the other which covers the new location. This guarantees that rmap > > can always find the migration PTE even if it is copied while rmap_walk is > > taking place. > > > > Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> > > This old chestnut. IIRC, this was the more complete solution to a fix that made > it into mainline. The patch still looks reasonable. It does add a kmalloc() > but I can't remember if we decided we were ok with it or not. Can you remind > me? More importantly, it appears to be surviving the original testcase that > this bug was about (20 minutes so far but will leave it a few hours). Assuming > the test does not crash; > Incidentally, after 6.5 hours this still hasn't crashed. Previously a worst case reproduction scenario for the bug was around 35 minutes. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- 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 policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>