linux-kernel - Re: [RELEASE] Userspace RCU 0.7.6

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Message-ID: <20130110085754.2d32b314@nehalam.linuxnetplumber.net>
Date:	Thu, 10 Jan 2013 08:57:54 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	linux-kernel@...r.kernel.org, lttng-dev@...ts.lttng.org,
	rp@...s.cs.pdx.edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RELEASE] Userspace RCU 0.7.6

On Thu, 10 Jan 2013 11:42:41 -0500
Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> * Stephen Hemminger (shemminger@...tta.com) wrote:
> > On Wed, 9 Jan 2013 13:46:17 -0500
> > Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> > 
> > > liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This
> > > data synchronization library provides read-side access which scales
> > > linearly with the number of cores. It does so by allowing multiples
> > > copies of a given data structure to live at the same time, and by
> > > monitoring the data structure accesses to detect grace periods after
> > > which memory reclamation is possible.
> > > 
> > > liburcu-cds provides efficient data structures based on RCU and
> > > lock-free algorithms. Those structures include hash tables, queues,
> > > stacks, and doubly-linked lists.
> > > 
> > > This is a bugfix release, mainly fixing handling of processes using
> > > call_rcu, then fork() without following exec(), and then continuing use
> > > of synchronize_rcu() or call_rcu() in the child process. A hang in
> > > synchronize_rcu() in the child could occur, which is fixed by this
> > > release.
> > > 
> > > Changelog:
> > > 2013-01-09 Userspace RCU 0.7.6
> > >         * Discourage use of pthread_atfork() for call_rcu handlers
> > >         * Fix call_rcu fork handling
> > >         * test: fork handling
> > >         * Fix TLS detection: test with linker, add --disable-compiler-tls
> > >         * Cleanup: cast pthread_self() return value to unsigned long
> > >         * Fallback mechanism not working on platform where TLS is unsupported
> > > 
> > > Project website: http://lttng.org/urcu
> > > Download link: http://lttng.org/files/urcu/
> > > 
> > 
> > Why is the git repository still at 0.7.4 and there is no tag for 0.7.6?
> > Am I looking at the right place?
> >   $ git remote -v
> > origin	git://git.lttng.org/userspace-rcu.git (fetch)
> 
> I tried doing this to confirm:
> 
> git clone git://git.lttng.org/userspace-rcu.git
> cd userspace-rcu
> git tag -l
> 
> and v0.7.6 is there.
> 
> Please note that this tag is in the stable-0.7 branch (not master).
> 
> Please let me know if the problem persists for you after making sure you
> use the right branch.
> 
> Thanks,
> 
> Mathieu
> 

Ok, I didn't see the stable branch.
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