How to check whether physical page is in-use?

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I am implementing kernel thread which scans whole physical pages in memory and inspect physical page frame numbers of in-used pages.
At first, I thought I can check whether specific page is used by PG_lru flag but the scan result came out strangely.



Is there other way to inspect page is in-use or free?



Should I have to check _mapcount field in struct page?



Please help me...
Thank you so much.







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    up vote
    2
    down vote

    favorite
    1












    I am implementing kernel thread which scans whole physical pages in memory and inspect physical page frame numbers of in-used pages.
    At first, I thought I can check whether specific page is used by PG_lru flag but the scan result came out strangely.



    Is there other way to inspect page is in-use or free?



    Should I have to check _mapcount field in struct page?



    Please help me...
    Thank you so much.







    share|improve this question
























      up vote
      2
      down vote

      favorite
      1









      up vote
      2
      down vote

      favorite
      1






      1





      I am implementing kernel thread which scans whole physical pages in memory and inspect physical page frame numbers of in-used pages.
      At first, I thought I can check whether specific page is used by PG_lru flag but the scan result came out strangely.



      Is there other way to inspect page is in-use or free?



      Should I have to check _mapcount field in struct page?



      Please help me...
      Thank you so much.







      share|improve this question














      I am implementing kernel thread which scans whole physical pages in memory and inspect physical page frame numbers of in-used pages.
      At first, I thought I can check whether specific page is used by PG_lru flag but the scan result came out strangely.



      Is there other way to inspect page is in-use or free?



      Should I have to check _mapcount field in struct page?



      Please help me...
      Thank you so much.









      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 15 at 6:47









      Debian_yadav

      8342522




      8342522










      asked Mar 15 at 5:38









      JuHyung Son

      707




      707

























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