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https://issues.apache.org/jira/browse/YARN-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437506#comment-15437506
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Gopal V commented on YARN-5551:
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bq. purposes of accounting for how much memory the process is using right now.
The crucial distinction is exactly there. YARN can account memory in two
different ways - "how much memory is this process using?" vs "how much memory
can I retrieve by killing this process?".
The 2nd question is what should motivate a process kill (btw, in the non-smaps
case, the kill is motivated by the first, with no concern for the 2nd).
> Ignore deleted file mapping from memory computation when smaps is enabled
> -------------------------------------------------------------------------
>
> Key: YARN-5551
> URL: https://issues.apache.org/jira/browse/YARN-5551
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: YARN-5551.branch-2.001.patch
>
>
> Currently deleted file mappings are also included in the memory computation
> when SMAP is enabled. For e.g
> {noformat}
> 7f612004a000-7f612004c000 rw-s 00000000 00:10 4201507513
> /dev/shm/HadoopShortCircuitShm_DFSClient_NONMAPREDUCE_-521969216_162_734673185
> (deleted)
> Size: 8 kB
> Rss: 4 kB
> Pss: 2 kB
> Shared_Clean: 0 kB
> Shared_Dirty: 4 kB
> Private_Clean: 0 kB
> Private_Dirty: 0 kB
> Referenced: 4 kB
> Anonymous: 0 kB
> AnonHugePages: 0 kB
> Swap: 0 kB
> KernelPageSize: 4 kB
> MMUPageSize: 4 kB
> 7f6123f99000-7f6163f99000 rw-p 00000000 08:41 211419477
> /grid/4/hadoop/yarn/local/usercache/root/appcache/application_1466700718395_1249/container_e19_1466700718395_1249_01_000003/7389389356021597290.cache
> (deleted)
> Size: 1048576 kB
> Rss: 637292 kB
> Pss: 637292 kB
> Shared_Clean: 0 kB
> Shared_Dirty: 0 kB
> Private_Clean: 0 kB
> Private_Dirty: 637292 kB
> Referenced: 637292 kB
> Anonymous: 637292 kB
> AnonHugePages: 0 kB
> Swap: 0 kB
> KernelPageSize: 4 kB
> {noformat}
> It would be good to exclude these from getSmapBasedRssMemorySize()
> computation.
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