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From: Norbert Preining <preining@logic.at>
To: David Rientjes <rientjes@google.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: khugepaged / firefox going wild in 3.18-rc
Date: Wed, 5 Nov 2014 09:10:26 +0900	[thread overview]
Message-ID: <20141105001026.GQ13232@auth.logic.tuwien.ac.at> (raw)
In-Reply-To: <alpine.DEB.2.10.1411041559170.2720@chino.kir.corp.google.com>

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
------------------------------------------------------------------------

  reply	other threads:[~2014-11-05  0:10 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-04 23:20 Norbert Preining
2014-11-05  0:00 ` David Rientjes
2014-11-05  0:10   ` Norbert Preining [this message]
2014-11-05  0:12     ` Norbert Preining
2014-11-05  0:20       ` David Rientjes
2014-11-06 12:25         ` Vlastimil Babka
2014-11-06 12:39           ` Norbert Preining
2014-11-06 13:03             ` Vlastimil Babka
2014-11-07 13:07               ` Norbert Preining
2014-11-07 13:38                 ` Vlastimil Babka
2014-11-07 13:57                   ` Norbert Preining
2014-11-07 15:44                     ` Vlastimil Babka

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