On Wed, 10 Aug 2011 11:47:19 +0100 Mel Gorman <mgorman@xxxxxxx> wrote: > The percentage that must be in writeback depends on the priority. At > default priority, all of them must be dirty. At DEF_PRIORITY-1, 50% > of them must be, DEF_PRIORITY-2, 25% etc. i.e. as pressure increases > the greater the likelihood the process will get throttled to allow > the flusher threads to make some progress. It'd be nice if the code comment were to capture this piece of implicit arithmetic. After all, it's a magic number and magic numbers should stick out like sore thumbs. And.. how do we know that the chosen magic numbers were optimal? -- 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=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>