loadable objectstore

Hi James,

Symbol is present in bss. This is what I find

$ nm libceph_filestore.so | grep tracepoint_dlopen
000000000047f8c0 b tracepoint_dlopen

Please note you have to comment the following line to check all the symbols on the so.

Thanks,
Varada

> -----Original Message-----
> From: James (Fei) Liu-SSI [mailto:james.liu@ssi.samsung.com]
> Sent: Tuesday, September 29, 2015 10:08 PM
> To: Varada Kari <Varada.Kari@sandisk.com>; Sage Weil
> <sage@newdream.net>; Matt W. Benjamin <matt@cohortfs.com>; Loic
> Dachary <loic@dachary.org>
> Cc: ceph-devel <ceph-devel@vger.kernel.org>
> Subject: RE: loadable objectstore
>
> Hi Varada,
>   Can you use command nm to see whether " tracepoint_dlopen" is defined
> in "./.libs/libceph_filestore.so"?
>
>
>  Regards,
>  James
>
>
> -----Original Message-----
> From: Varada Kari [mailto:Varada.Kari@sandisk.com]
> Sent: Monday, September 28, 2015 6:21 PM
> To: James (Fei) Liu-SSI; Sage Weil; Matt W. Benjamin; Loic Dachary
> Cc: ceph-devel
> Subject: RE: loadable objectstore
>
> No James, Facing library issues with libnss3 and libcommon(ceph). Will
> resolve them, generate a new pull request soon on master.
>
> Thanks,
> Varada
>
> > -----Original Message-----
> > From: James (Fei) Liu-SSI [mailto:james.liu@ssi.samsung.com]
> > Sent: Monday, September 28, 2015 11:51 PM
> > To: Varada Kari <Varada.Kari@sandisk.com>; Sage Weil
> > <sage@newdream.net>; Matt W. Benjamin <matt@cohortfs.com>; Loic
> > Dachary <loic@dachary.org>
> > Cc: ceph-devel <ceph-devel@vger.kernel.org>
> > Subject: RE: loadable objectstore
> >
> > Hi Varada,
> >   Have you rebased the pull request to master already?
> >
> >   Thanks,
> >   James
> >
> > -----Original Message-----
> > From: ceph-devel-owner@vger.kernel.org [mailto:ceph-devel-
> > owner@vger.kernel.org] On Behalf Of Varada Kari
> > Sent: Friday, September 11, 2015 3:28 AM
> > To: Sage Weil; Matt W. Benjamin; Loic Dachary
> > Cc: ceph-devel
> > Subject: RE: loadable objectstore
> >
> > Hi Sage/ Matt,
> >
> > I have submitted the pull request based on wip-plugin branch for the
> > object store factory implementation at
> https://github.com/ceph/ceph/pull/5884 .
> > Haven't rebased to the master yet. Working on rebase and including new
> > store in the factory implementation.  Please have a look and let me
> > know your comments. Will submit a rebased PR soon with new store
> integration.
> >
> > Thanks,
> > Varada
> >
> > -----Original Message-----
> > From: ceph-devel-owner@vger.kernel.org [mailto:ceph-devel-
> > owner@vger.kernel.org] On Behalf Of Varada Kari
> > Sent: Friday, July 03, 2015 7:31 PM
> > To: Sage Weil <sage@newdream.net>; Adam Crume
> <adamcrume@gmail.com>
> > Cc: Loic Dachary <loic@dachary.org>; ceph-devel <ceph-
> > devel@vger.kernel.org>; Matt W. Benjamin <matt@cohortfs.com>
> > Subject: RE: loadable objectstore
> >
> > Hi All,
> >
> > Not able to make much progress after making common as a shared object
> > along with object store.
> > Compilation of the test binaries are failing with "./.libs/libceph_filestore.so:
> > undefined reference to `tracepoint_dlopen'".
> >
> >   CXXLD    ceph_streamtest
> > ./.libs/libceph_filestore.so: undefined reference to `tracepoint_dlopen'
> > collect2: error: ld returned 1 exit status
> > make[3]: *** [ceph_streamtest] Error 1
> >
> > But libfilestore.so is linked with lttng-ust.
> >
> > src/.libs$ ldd libceph_filestore.so
> >         libceph_keyvaluestore.so.1 => /home/varada/obs-factory/plugin-
> > work/src/.libs/libceph_keyvaluestore.so.1 (0x00007f5e50f50000)
> >         libceph_os.so.1 => /home/varada/obs-factory/plugin-
> > work/src/.libs/libceph_os.so.1 (0x00007f5e4f93a000)
> >         libcommon.so.1 => /home/varada/ obs-factory/plugin-
> > work/src/.libs/libcommon.so.1 (0x00007f5e4b5df000)
> >         liblttng-ust.so.0 =>
> > /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0
> > (0x00007f5e4b179000)
> >         liblttng-ust-tracepoint.so.0 =>
> > /usr/lib/x86_64-linux-gnu/liblttng-ust-
> > tracepoint.so.0 (0x00007f5e4a021000)
> >         liburcu-bp.so.1 => /usr/lib/liburcu-bp.so.1 (0x00007f5e49e1a000)
> >         liburcu-cds.so.1 => /usr/lib/liburcu-cds.so.1
> > (0x00007f5e49c12000)
> >
> > Edited the above output just show the dependencies.
> > Did anyone face this issue before?
> > Any help would be much appreciated.
> >
> > Thanks,
> > Varada
> >
> > -----Original Message-----
> > From: ceph-devel-owner@vger.kernel.org [mailto:ceph-devel-
> > owner@vger.kernel.org] On Behalf Of Varada Kari
> > Sent: Friday, June 26, 2015 3:34 PM
> > To: Sage Weil
> > Cc: Loic Dachary; ceph-devel; Matt W. Benjamin
> > Subject: RE: loadable objectstore
> >
> > Hi,
> >
> > Made some more changes to resolve lttng problems at
> > https://github.com/varadakari/ceph/commits/wip-plugin.
> > But couldn’t by pass the issues. Facing some issues like mentioned below.
> >
> > ./.libs/libceph_filestore.so: undefined reference to `tracepoint_dlopen'
> >
> > Compiling with -llttng-ust is not resolving the problem. Seen some
> > threads in devel list before, mentioning this problem.
> > Can anyone take a look and guide me to fix this problem?
> >
> > Haven't made the changes to change the plugin name etc... will be
> > making them as part of cleanup.
> >
> > Thanks,
> > Varada
> >
> > -----Original Message-----
> > From: ceph-devel-owner@vger.kernel.org [mailto:ceph-devel-
> > owner@vger.kernel.org] On Behalf Of Varada Kari
> > Sent: Monday, June 22, 2015 8:57 PM
> > To: Matt W. Benjamin
> > Cc: Loic Dachary; ceph-devel; Sage Weil
> > Subject: RE: loadable objectstore
> >
> > Hi Matt,
> >
> > Majority of the changes are segregating the files to corresponding
> > shared object and creating a factory object. And the naming is mostly
> > taken from Erasure-coding plugins. Want a good naming convention :-),
> > hence a preliminary review. Do agree, we have lot of loadable
> > interfaces, and I think we are in the way of making them on-demand (if
> > possible) loadable modules.
> >
> > Varada
> >
> > -----Original Message-----
> > From: Matt W. Benjamin [mailto:matt@cohortfs.com]
> > Sent: Monday, June 22, 2015 8:37 PM
> > To: Varada Kari
> > Cc: Loic Dachary; ceph-devel; Sage Weil
> > Subject: Re: loadable objectstore
> >
> > Hi,
> >
> > It's just aesthetic, but it feels clunky to change the names of well
> > known modules to <something>Plugin--esp. if that generalizes forward
> > to new loadable modules (and we have a lot of loadable interfaces).
> >
> > Matt
> >
> > ----- "Varada Kari" <Varada.Kari@sandisk.com> wrote:
> >
> > > Hi Sage,
> > >
> > > Please find the initial implementation of objects store factory
> > > (initial cut) at
> > >
> >
> https://github.com/varadakari/ceph/commit/9d5fe2fecf38ba106c7c7b7a3ed
> > e
> > > 4f189ec7e1c8
> > >
> > > This is still work in progress branch. Right now I am facing Lttng
> > > issues,
> > > LTTng-UST: Error (-17) while registering tracepoint probe. Duplicate
> > > registration of tracepoint probes having the same name is not allowed.
> > >
> > > Might be an issue with libcommon inclusion. Trying resolving the
> > > issue now. Seems I need to make libcommon also as a shared object to
> > > avoid the duplicates, static linking is a problem here.
> > > Any suggestions or comments on this problem?
> > >
> > >
> > > I have commented out test binary (ceph_test_keyvaluedb_atomicity)
> > > compilation, due to unresolved symbols for g_ceph_context and g_conf.
> > > Not able to fix/workaround the problem so far.
> > >
> > > Can you please review if this is what in your mind for the factory
> > > implementation?
> > >
> > > We can extend this implementation to messenger and different backend
> > > of the OSD. Will make those incremental once the base framework is
> > > approved.
> > >
> > > Thanks,
> > > Varada
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Sage Weil [mailto:sage@newdream.net]
> > > Sent: Tuesday, May 12, 2015 5:11 AM
> > > To: Varada Kari
> > > Cc: Loic Dachary; Matt W. Benjamin; ceph-devel
> > > Subject: RE: loadable objectstore
> > >
> > > Hi Varada,
> > >
> > > Any progress on this?
> > >
> > > Thanks!
> > > sage
> > >
> > > On Sat, 11 Apr 2015, Varada Kari wrote:
> > >
> > > > Thanks Sage and Loic. Will add the missing pieces and integrate
> > > > the
> > > object factory and plugin changes.
> > > >
> > > > Varada
> > > >
> > > > -----Original Message-----
> > > > From: Sage Weil [mailto:sage@newdream.net]
> > > > Sent: Saturday, April 11, 2015 9:19 PM
> > > > To: Loic Dachary
> > > > Cc: Varada Kari; Matt W. Benjamin; ceph-devel
> > > > Subject: Re: loadable objectstore
> > > >
> > > > On Sat, 11 Apr 2015, Loic Dachary wrote:
> > > > > Hi Sage,
> > > > >
> > > > > It looks like common/PluginRegistry.{h,cc} are missing from
> > > > > 18ad8df1094db52c839dc6b2dc689fc882230acb
> > > >
> > > > whoops pushed! :)
> > > >
> > > > sage
> > > >
> > > > >
> > > > > Cheers
> > > > >
> > > > > On 11/04/2015 16:51, Sage Weil wrote:
> > > > > > On Sat, 11 Apr 2015, Varada Kari wrote:
> > > > > >> Hi Matt/ Sage,
> > > > > >>
> > > > > >> Thanks for sharing the pull request. Will work on the items
> > > what
> > > > > >> sage was mentioning in the comments along with the items in
> > > > > >> the
> > > tracker.
> > > > > >
> > > > > > I pushed a wip-plugin branch with the pattern I had in mind...
> > > > > > does this make sense?  It's only compile tested, and still
> > > needs
> > > > > > preload() methods implemented so that long-running daemons (or
> > > > > > perhaps others?) can preload it all at once.
> > > > > >
> > > > > > Ideally we would replace ErasurePluginRegistry with this too,
> > > > > > which means the naming of the .so's needs to be a bit more
> > > > > > flexible as the EC plugin scheme is something like
> > > > > > /usr/lib/ceph/erasure-code/libec_$name.so (not a strict
> > > > > > function
> > >
> > > > > > of type and name).  Or actually, we can just rename the EC
> > > > > > .so's
> > >
> > > > > > when this goes in?  Since they're explicitly incompatible
> > > between
> > > > > > versions there is no reason the names need to remain
> > > consistent...
> > > > > >
> > > > > > sage
> > > > > >
> > > > > >>
> > > > > >> Varada
> > > > > >>
> > > > > >> -----Original Message-----
> > > > > >> From: Sage Weil [mailto:sage@newdream.net]
> > > > > >> Sent: Saturday, April 11, 2015 4:16 AM
> > > > > >> To: Matt W. Benjamin
> > > > > >> Cc: Varada Kari; ceph-devel
> > > > > >> Subject: Re: loadable objectstore
> > > > > >>
> > > > > >> On Fri, 10 Apr 2015, Matt W. Benjamin wrote:
> > > > > >>> Hi Varada,
> > > > > >>>
> > > > > >>> I pushed branch hammer-osfactory to
> > > > > >>> https://github.com/linuxbox2/ceph.git
> > > > > >>>
> > > > > >>> It can at least provide a starting point for discussion, if
> > > not
> > > > > >>> a jumping off point;  I do think it's basically what Sage
> > > described.
> > > > > >>
> > > > > >> I made a few comments on the pull request.  I think a factory
> > > class is the way to go, but we should be able to make the plugin
> > > loading part generic and not interface specific at all...
> > > > > >>
> > > > > >> sage
> > > > > >>
> > > > > >>>
> > > > > >>> I was able to update the CMake build system to build the
> > > > > >>> tree,
> > > I
> > > > > >>> haven't attempted Autotools. :(
> > > > > >>>
> > > > > >>> Regards,
> > > > > >>>
> > > > > >>> Matt
> > > > > >>>
> > > > > >>> --
> > > > > >>> Matt Benjamin
> > > > > >>> CohortFS, LLC.
> > > > > >>> 315 West Huron Street, Suite 140A Ann Arbor, Michigan 48103
> > > > > >>>
> > > > > >>> http://cohortfs.com
> > > > > >>>
> > > > > >>> tel.  734-761-4689
> > > > > >>> fax.  734-769-8938
> > > > > >>> cel.  734-216-5309
> > > > > >>> --
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> > > > > >>>
> > > > > >>
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> > > > > Loïc Dachary, Artisan Logiciel Libre
> > > > >
> > > > >
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> >
> > --
> > Matt Benjamin
> > CohortFS, LLC.
> > 315 West Huron Street, Suite 140A
> > Ann Arbor, Michigan 48103
> >
> > http://cohortfs.com
> >
> > tel.  734-761-4689
> > fax.  734-769-8938
> > cel.  734-216-5309
> >
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loadable objectstore

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Patch