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IZ98667: HIGH KERNEL MEMORY USAGE ON NFS4 CLIENT WHEN USING BLOCKING LOCK APPLIES TO AIX 5300-12

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APAR status

  • Closed as program error.

Error description

  • When running applications that use blocking locks, it is
possible that NFSv4 client systems use a lot of memory.
This
happens when the blocking lock requests are denied
thereby causing
the client to have to keep retrying the operation. This
is _not_
a memory leak, since the memory will get freed when the
lock
operation succeeds. So as long as the lock request is not
satisfied
the memory usage could grow.

Local fix

  • Allow the lock request to be satisfied by causing the
current owner of
the lock to release it.
Or, stop the process that is blocked on the lock request,
so that
the lock request is not retried.

Problem summary

  • When a process blocks waiting for a lock on a file in NFS,
memory usage increases till the process aquires the lock.

Problem conclusion

  • Made code changes to reuse memory instead of allocating
over and over again.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ98667
    • 

  • Reported component name
    AIX  5.3
    • 

  • Reported component ID
    5765G0300
    • 

  • Reported release
    530
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-04-11
    • 

  • Closed date
    2011-04-11
    • 

  • Last modified date
    2013-04-16
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    
IZ98192
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    AIX  5.3
    • 

  • Fixed component ID
    5765G0300
    • 



Applicable component levels


    

  • R530  PSY  U841150
       UP11/06/16  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 April 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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