linux-kernel - Re: khugepaged / firefox going wild in 3.18-rc

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Date:	Wed, 5 Nov 2014 09:12:43 +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,

one more thing, attached dmesg output with some page faults,
maybe this is connected?

On Wed, 05 Nov 2014, Norbert Preining wrote:
> 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
> 
> 

Norbert

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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
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View attachment "dmesg.txt" of type "text/plain" (5196 bytes)