RFR: 8178784: Revisit changes for making Serviceability Agent attach functionality optional

Mikael Vidstedt mikael.vidstedt at oracle.com
Thu May 25 18:27:51 UTC 2017


Thanks a lot for looking into this! The changes look good. One question:

Would it be possible to implement the whole opendir/readdir/closedir walk as an alternative implementation of read_thread_info in libproc_impl.c instead? Without having tried it, I think that would mean you can revert the whole ps_core.c file back to what it was before I added the #include guards, and all the special logic will instead be in libproc_impl.c.

Minor nit: there are a few places where you have a space between the function name and the parenthesis (after readdir for example), which doesn’t seem to be the style used in the rest of the places in the SA.


> On May 25, 2017, at 5:26 AM, Jini George <jini.george at oracle.com> wrote:
> Hi all,
> Please review the changes for enabling live debugging (attaching to a process) with SA on Alpine Linux.
> Webrev: http://cr.openjdk.java.net/~jgeorge/8178784/webrev.00/
> Issue: https://bugs.openjdk.java.net/browse/JDK-8178784
> The crux of the changes are:
> 1. To include the functions #ifdef-ed out by INCLUDE_SA_ATTACH, and to correct build errors resulting due to the inclusion of these functions.
> 2. SA on Linux uses the thread_db library for attach debugging. This library is not available on Alpine Linux. So instead of relying on thread_db, I have made changes to iterate over the list of tasks in the /proc/<pid>/task directory to find the list of threads to ptrace attach to. This enables the jhsdb commands like threads, jstack etc.
> Thanks,
> Jini.

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