[Gluster-devel] Script to identify ref leaks

[Atin Mukherjee]

On Fri, 31 Mar 2017 at 18:15, Niels de Vos <ndevos at redhat.com> wrote:

> On Fri, Mar 31, 2017 at 02:34:04PM +0530, Sanoj Unnikrishnan wrote:
> > +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.
>
> Yes, or we can place them in their own repository. I have a
> gluster-debug repository where I plan to put tools I use for debugging.
> This repository may well live at the Gluster organization on GitHub too.
>
> https://github.com/nixpanic/gluster-debug
>
> Many of the tools we use for debugging should not be version specific,
> so having them in the glusterfs repository might be a little awkward?
>
> What are the opinions of others?


My personal preference would be to host it under one central repo instead
of individual github accounts. Versioning and such other issues can be
tackled having good documentation around these tools.


>
> Thanks,
> Niels
>
>
> > 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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> > > Gluster-devel at gluster.org
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> > >
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-- 
- Atin (atinm)
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