[WIP] TDB traverse lock changes for massive AD DC perf improvement

[Andrew Bartlett]

On Fri, 2017-03-31 at 13:23 -0700, Jeremy Allison wrote:
> On Sat, Apr 01, 2017 at 09:05:48AM +1300, Andrew Bartlett via samba-
> technical wrote:
> > 
> > I've now done that.  This feels closer to the correct solution, but
> > throws solaris10 under the bus for now.  See the attached patch.
> 
> Solaris10 is already under the bus wheels. They incorrectly
> prevent an existing open UNIX domain socket from being accessed
> from a non-root process (i.e. their permission check is being
> done on time of use, not time of open). This breaks asynchronous
> messaging in Samba.
> 
> I've logged this as a bug with Oracle, but I don't expect
> this will ever get fixed.
> 
> It does mean that we should probably stop caring about
> Solaris long term and put it in the same bucket as HPUX/IRIX/
> AIX/True64 and the like. Sad, but practical.

Thanks.  I wasn't at all sure how to translate the few details in the
commit message back into a test case and then workaround.

This set of patches passes a full make test for me 3 times over (it
wouldn't shock me if this fixes some flapping tests). 

Graphs of the perf tests with these patches attached.  The performance
improvement for un-indexed searches on the AD DC is really impressive!

Aside from a good delay so others can comment, what would you recommend
I do next towards progressing this patch?

Thanks,

Andrew Bartlett

-- 
Andrew Bartlett                       http://samba.org/~abartlet/
Authentication Developer, Samba Team  http://samba.org
Samba Developer, Catalyst IT          http://catalyst.net.nz/services/samba
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