On 11/19/2015 09:29 PM, Vlastimil Babka wrote: > +CC Andrea, David, Joonsoo > > On 11/19/2015 10:29 AM, Aaron Lu wrote: >> The vmstat and perf-profile are also attached, please let me know if you >> need any more information, thanks. > > Output from vmstat (the tool) isn't much useful here, a periodic "cat > /proc/vmstat" would be much better. No problem. > The perf profiles are somewhat weirdly sorted by children cost (?), but > I noticed a very high cost (46%) in pageblock_pfn_to_page(). This could > be due to a very large but sparsely populated zone. Could you provide > /proc/zoneinfo? Is a one time /proc/zoneinfo enough or also a periodic one? > If the compaction scanners behave strangely due to a bug, enabling the > ftrace compaction tracepoints should help find the cause. That might > produce a very large output, but maybe it would be enough to see some > parts of it (i.e. towards beginning, middle, end of the experiment). I'll see how to do this, never used ftrace before. Thanks for the quick response. Regards, Aaron -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>