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 from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
