Find number of dirty pages (modified pages) for a process

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I am trying to track the rate at which pages are being modified by a process in Linux and I came across this Soft Dirty PTEs which certainly can help me.



I was also able to find a c script that makes use of maps and pagemap to get me the PTEs parsed along with the dirty bit at this SO Answer - pagemap_dump.c.



However, when I do run this for any process, I always see 0 in the soft-dirty bit field. I have tried by giving PID of Stress running memory tests (-m option malloc()/free()) and I still get all 0 in soft-dirty bit. I am not sure if that is the correct behavior.



Has anyone been able to correctly extract the soft-dirty bits from this? OR is there another way of getting the number of dirty pages for a process without modifying the kernel?



I am running Ubuntu 14.04.5 LTS with 3.13.0-128-generic kernel.

And I have also tried this on Ubuntu 16.04.4 LTS with 4.4.0-116-generic kernel.






ubuntu memory process-management







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    down vote

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    I am trying to track the rate at which pages are being modified by a process in Linux and I came across this Soft Dirty PTEs which certainly can help me.



    I was also able to find a c script that makes use of maps and pagemap to get me the PTEs parsed along with the dirty bit at this SO Answer - pagemap_dump.c.



    However, when I do run this for any process, I always see 0 in the soft-dirty bit field. I have tried by giving PID of Stress running memory tests (-m option malloc()/free()) and I still get all 0 in soft-dirty bit. I am not sure if that is the correct behavior.



    Has anyone been able to correctly extract the soft-dirty bits from this? OR is there another way of getting the number of dirty pages for a process without modifying the kernel?



    I am running Ubuntu 14.04.5 LTS with 3.13.0-128-generic kernel.

    And I have also tried this on Ubuntu 16.04.4 LTS with 4.4.0-116-generic kernel.






    ubuntu memory process-management







    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am trying to track the rate at which pages are being modified by a process in Linux and I came across this Soft Dirty PTEs which certainly can help me.



      I was also able to find a c script that makes use of maps and pagemap to get me the PTEs parsed along with the dirty bit at this SO Answer - pagemap_dump.c.



      However, when I do run this for any process, I always see 0 in the soft-dirty bit field. I have tried by giving PID of Stress running memory tests (-m option malloc()/free()) and I still get all 0 in soft-dirty bit. I am not sure if that is the correct behavior.



      Has anyone been able to correctly extract the soft-dirty bits from this? OR is there another way of getting the number of dirty pages for a process without modifying the kernel?



      I am running Ubuntu 14.04.5 LTS with 3.13.0-128-generic kernel.

      And I have also tried this on Ubuntu 16.04.4 LTS with 4.4.0-116-generic kernel.






      ubuntu memory process-management







      share|improve this question













      I am trying to track the rate at which pages are being modified by a process in Linux and I came across this Soft Dirty PTEs which certainly can help me.



      I was also able to find a c script that makes use of maps and pagemap to get me the PTEs parsed along with the dirty bit at this SO Answer - pagemap_dump.c.



      However, when I do run this for any process, I always see 0 in the soft-dirty bit field. I have tried by giving PID of Stress running memory tests (-m option malloc()/free()) and I still get all 0 in soft-dirty bit. I am not sure if that is the correct behavior.



      Has anyone been able to correctly extract the soft-dirty bits from this? OR is there another way of getting the number of dirty pages for a process without modifying the kernel?



      I am running Ubuntu 14.04.5 LTS with 3.13.0-128-generic kernel.

      And I have also tried this on Ubuntu 16.04.4 LTS with 4.4.0-116-generic kernel.






      ubuntu memory process-management




      ubuntu memory process-management






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      asked 12 mins ago









      Wajahat

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