[Gluster-devel] Script to identify ref leaks

[Sanoj Unnikrishnan]

+Mohit
Mohit had written a similar script to RCA an issue couple of months back.

It would help if we placed the scripts, tapsets in the source tree itself
(maybe in a directory under glusterfs/extras/).
We could also have the tapset packaged into debuginfo packages and deployed
under /usr/share/systemtap/ path upon installation.
Regards,
Sanoj

On Fri, Mar 31, 2017 at 12:44 PM, Sonal Arora <sarora at redhat.com> wrote:

> Hi,
>
> I am working on finding ways to indentify ref leaks in glusterfs.
>
> Description of Issue : https://bugzilla.redhat.com/show_bug.cgi?id=1417539
>
> Goal : To make script which could detect all kind of ref leaks.
>
> Script : https://github.com/SonaArora/Tracing-userspace-app/blob/
> master/ref-leak/try8-modified
> The above script is a POC program to depict the idea of how to identify
> leaks. Script is probing dict_ref() and dict_unref() and keeping a track of
> the pointers, back traces which are referenced/dereferenced by above
> functions. If the count of refs is unequal to unrefs for each pointer,it
> will print all the traces corresponding to the leaked pointer.
> Output : https://github.com/SonaArora/Tracing-userspace-
> app/blob/master/ref-leak/output-refleak
> I am working on post processing the output - to filter only the leaked
> traces and to write the output after every few hours into a file.
> The script can be extended to all objects being referenced (like
> inodes/fds).
>
> End Goal : Future goal is to make it more versatile, dynamic and light
> weight so that it can be even utilized on production environments without
> utilizing much of the system resources.
>
> Request your comments and suggestions.
>
> Best
> -Sonal
>
>
>
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