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Message-ID: <20141105001026.GQ13232@auth.logic.tuwien.ac.at> Date: Wed, 5 Nov 2014 09:10:26 +0900 From: Norbert Preining <preining@...ic.at> To: David Rientjes <rientjes@...gle.com> Cc: linux-kernel@...r.kernel.org Subject: Re: khugepaged / firefox going wild in 3.18-rc Hi David, thanks for your answer. On Tue, 04 Nov 2014, David Rientjes wrote: > If you have the ability to kill your X session, then you presumably are > able to capture /proc/pid/stack for these pids to see where it is busy. Yes I can do that, I can even reproduce it on *every* start of iceweasel after it happened the first time. There is no /proc/PID/stack, though ..... > It might also be helpful to see how the grep ^thp_ /proc/vmstat and > grep ^compact_ /proc/vmstat counters change over time. I captured that over timne, as well as the contents of /proc/PID/stat for iceweasel and khugepaged. There are some numbers steadily increasing. Here is what I got: START thp_fault_alloc 9092 thp_fault_fallback 87 thp_collapse_alloc 5003 thp_collapse_alloc_failed 19 thp_split 2889 thp_zero_page_alloc 2 thp_zero_page_alloc_failed 0 compact_migrate_scanned 400301 compact_free_scanned 8634053 compact_isolated 687993 compact_stall 567 compact_fail 101 compact_success 466 thp_fault_alloc 9127 thp_fault_fallback 100 thp_collapse_alloc 5008 thp_collapse_alloc_failed 19 thp_split 2892 thp_zero_page_alloc 2 thp_zero_page_alloc_failed 0 compact_migrate_scanned 430094 compact_free_scanned 10444689 compact_isolated 709843 compact_stall 603 compact_fail 130 compact_success 473 === thp_fault_alloc 9127 thp_fault_fallback 100 thp_collapse_alloc 5008 thp_collapse_alloc_failed 19 thp_split 2892 thp_zero_page_alloc 2 thp_zero_page_alloc_failed 0 compact_migrate_scanned 430094 compact_free_scanned 10444689 compact_isolated 709843 compact_stall 603 compact_fail 130 compact_success 473 === thp_fault_alloc 9127 thp_fault_fallback 100 thp_collapse_alloc 5008 thp_collapse_alloc_failed 19 thp_split 2892 thp_zero_page_alloc 2 thp_zero_page_alloc_failed 0 compact_migrate_scanned 430094 compact_free_scanned 10444689 compact_isolated 709843 compact_stall 603 compact_fail 130 compact_success 473 === thp_fault_alloc 9127 thp_fault_fallback 100 thp_collapse_alloc 5008 thp_collapse_alloc_failed 19 thp_split 2892 thp_zero_page_alloc 2 thp_zero_page_alloc_failed 0 compact_migrate_scanned 430094 compact_free_scanned 10444689 compact_isolated 709843 compact_stall 603 compact_fail 130 compact_success 473 === /proc/PID/stat for iceweasel over some time: 8927 (iceweasel) R 27016 26901 26901 0 -1 4204544 100479 2248 5 0 565 14849 1 0 20 0 47 0 38224838 1134931968 84204 18446744073709551615 139840244875264 139840244981188 140737356374240 140737356331656 139840166756100 0 0 4096 17583 18446744073709551615 0 0 17 2 0 0 1 0 0 139840247078912 139840247080712 139840278519808 140737356376815 140737356376825 140737356376825 140737356378085 0 8927 (iceweasel) R 27016 26901 26901 0 -1 4204544 100479 2248 5 0 565 15130 1 0 20 0 47 0 38224838 1134931968 84204 18446744073709551615 139840244875264 139840244981188 140737356374240 140737356331656 139840166756100 0 0 4096 17583 18446744073709551615 0 0 17 1 0 0 1 0 0 139840247078912 139840247080712 139840278519808 140737356376815 140737356376825 140737356376825 140737356378085 0 8927 (iceweasel) R 27016 26901 26901 0 -1 4204544 100479 2248 5 0 565 15460 1 0 20 0 47 0 38224838 1134931968 84204 18446744073709551615 139840244875264 139840244981188 140737356374240 140737356331656 139840166756100 0 0 4096 17583 18446744073709551615 0 0 17 1 0 0 1 0 0 139840247078912 139840247080712 139840278519808 140737356376815 140737356376825 140737356376825 140737356378085 0 8927 (iceweasel) R 27016 26901 26901 0 -1 4204544 100479 2248 5 0 565 15724 1 0 20 0 47 0 38224838 1134931968 84204 18446744073709551615 139840244875264 139840244981188 140737356374240 140737356331656 139840166756100 0 0 4096 17583 18446744073709551615 0 0 17 1 0 0 1 0 0 139840247078912 139840247080712 139840278519808 140737356376815 140737356376825 140737356376825 140737356378085 0 /proc/PID/stat for khugepaged over some time: 35 (khugepaged) R 2 0 0 0 -1 2107456 0 0 0 0 0 39779 0 0 39 19 1 0 22 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 0 0 0 17 0 0 0 0 0 0 0 0 0 0 0 0 0 0 35 (khugepaged) R 2 0 0 0 -1 2107456 0 0 0 0 0 40104 0 0 39 19 1 0 22 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 0 0 0 17 2 0 0 0 0 0 0 0 0 0 0 0 0 0 35 (khugepaged) R 2 0 0 0 -1 2107456 0 0 0 0 0 40516 0 0 39 19 1 0 22 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 0 0 0 17 2 0 0 0 0 0 0 0 0 0 0 0 0 0 35 (khugepaged) R 2 0 0 0 -1 2107456 0 0 0 0 0 40797 0 0 39 19 1 0 22 0 0 18446744073709551615 0 0 0 0 0 0 0 2147483647 0 0 0 0 17 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Hope that helps Norbert ------------------------------------------------------------------------ PREINING, Norbert http://www.preining.info JAIST, Japan TeX Live & Debian Developer GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13 ------------------------------------------------------------------------ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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