On Sun, 2011-09-04 at 09:53 +0800, Wu Fengguang wrote: > De-account the accumulative dirty counters on page redirty. > > Page redirties (very common in ext4) will introduce mismatch between > counters (a) and (b) > > a) NR_DIRTIED, BDI_DIRTIED, tsk->nr_dirtied > b) NR_WRITTEN, BDI_WRITTEN > > This will introduce systematic errors in balanced_rate and result in > dirty page position errors (ie. the dirty pages are no longer balanced > around the global/bdi setpoints). > So wtf is ext4 doing? Shouldn't a page stay dirty until its written out? That is, should we really frob around this behaviour or fix ext4 because its on crack? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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