On Tue, Jul 06, 2010 at 04:25:39PM +0100, Mel Gorman wrote: > On Tue, Jul 06, 2010 at 08:24:57PM +0900, Minchan Kim wrote: > > but it is still problem in case of swap file. > > That's because swapout on swapfile cause file system writepage which > > makes kernel stack overflow. > > I don't *think* this is a problem unless I missed where writing out to > swap enters teh filesystem code. I'll double check. It bypasses the fs. On swapon, the blocks are resolved (mm/swapfile.c::setup_swap_extents) and then the writeout path uses bios directly (mm/page_io.c::swap_writepage). (GFP_NOFS still includes __GFP_IO, so allows swapping) Hannes -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>