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https://issues.apache.org/jira/browse/YARN-5551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437415#comment-15437415
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Nathan Roberts commented on YARN-5551:
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I think the two examples you provided in the description are actually 2 very
different cases. Notice how the first has an anonymous size of 0 while the
second has the entire dirty region marked as anonymous. I think (not certain
here), that this means in the first case the kernel actually has file-backed
pages to write to if necessary. In the second case, I feel like anonymous means
it does NOT have a place to put dirty pages (like maybe the file has been both
truncated and unlinked). If that's a correct interpretation of "anonymous" then
I feel like we should be counting the second mapping in the processes memory
usage.
> 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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