On Mon, Nov 15, 2010 at 02:03:55PM -0500, Chris Mason wrote: > It always returns either -EIO or -EAGAIN, so the caller will try again > and then end up waiting on PageWriteback? Returning any error from ->writepage will make writeout return -EIO so aborting the migration for that page. If no error is returned from ->writepage, writeout will return -EAGAIN the caller will try again after wait_on_page_writeback. I think I misread the code when in prev mail I worried about not waiting on PG_writeback after writeout()... :) So the ideal would be not to return errors when ->writepage submitted the writeback I/O successfully but if it returns -EIO/-EAGAIN there's no risk whatsoever (except compaction will be less effective). -- 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>