[jira] [Commented] (TS-3883) ats_madvise() has no effect on Linux (including MADV_DONTDUMP)

["Phil Sorber (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-3883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14726439#comment-14726439 ] 

Phil Sorber commented on TS-3883:
---------------------------------

ats_madvise is not used anywhere outside of the freelist, I think it should just be removed. I plan on fixing this soon.

> ats_madvise() has no effect on Linux (including MADV_DONTDUMP)
> --------------------------------------------------------------
>
>                 Key: TS-3883
>                 URL: https://issues.apache.org/jira/browse/TS-3883
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Core
>            Reporter: Gancho Tenev
>            Assignee: Phil Sorber
>             Fix For: 6.1.0
>
>
> While investigating unrelated issue with truncated core dumps on Linux, noticed that we run out of space on a few machines because of huge core dumps which were tending to the ATS process virtual memory size (reported by /proc/<pid>/status:VmSize on Linux).
> It looked like MADV_DONTDUMP memory use advice was not set properly.
> Further debugging showed that we have the following code in ats_madvise():
> {code}
> #if defined(linux)
> (void)addr;
> (void)len;
> (void)flags;
> return 0;
> #else . . .
> {code}
> Which would lead ats_madvise() to have no effect when "defined(linux)" is true, and would skip the necessary madvise() call to set MADV_DONTDUMP.



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