On Wed, Jun 01, 2011 at 01:57:47AM +0100, Mel Gorman wrote: > On Tue, May 31, 2011 at 04:14:02PM +0200, Andrea Arcangeli wrote: > > On Tue, May 31, 2011 at 10:33:40PM +0900, Minchan Kim wrote: > > > I checked them before sending patch but I got failed to find strange things. :( > > > > My review also doesn't show other bugs in migrate_pages callers like > > that one. > > > > > Now I am checking the page's SwapBacked flag can be changed > > > between before and after of migrate_pages so accounting of NR_ISOLATED_XX can > > > make mistake. I am approaching the failure, too. Hmm. > > > > When I checked that, I noticed the ClearPageSwapBacked in swapcache if > > radix insertion fails, but that happens before adding the page in the > > LRU so it shouldn't have a chance to be isolated. > > > > After hammering three machines for several hours, I managed to trigger > this once on x86 !CONFIG_SMP CONFIG_PREEMPT HIGHMEM4G (so no PAE) > and caught the following trace. > Umm, HIGHMEM4G implies a two-level pagetable layout so where are things like _PAGE_BIT_SPLITTING being set when THP is enabled? -- Mel Gorman SUSE Labs -- 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>