[lttng-dev] New article about Userspace RCU on LWN

[lttng-dev] New article about Userspace RCU on LWN

[Mathieu Desnoyers]

Hi,

Paul McKenney, Lai Jianshan, Josh Triplett and myself just published a series of articles on Userspace RCU on Linux Weekly News. You can find the top-level article at this URL:

https://lwn.net/Articles/573424/

Those articles introduce the Userspace RCU library, explaining how to use RCU and the data structures it contains. Access to those articles is restricted to LWN subscribers for a week after publication, and should be freely available afterward.

Feedback is welcome!

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

[lttng-dev] New article about Userspace RCU on LWN

[Duncan Sands]

Hi Mathieu, nice articles, now I can point my co-workers at it when they ask me
what this RCU stuff is all about :)  I noticed that the article
  http://lwn.net/Articles/573431/
says

"The hash table can then be allocated:

     ht = cds_lfht_new(1, 1, 0, CDS_LFHT_AUTO_RESIZE, NULL);
  The first 1 specifies the initial number of hash buckets in the table, the
  second 1 specifies the minimum number of hash buckets, and the 0 specifies the
  maximum number of hash buckets. All three quantities must be powers of two,
  except for the special case of 0 for the third argument, which specifies an
  unlimited maximum number of hash buckets."

However the rculfhash.h header doesn't say that the third argument can be zero.
All it says is:

  * @max_nr_buckets: the maximum number of hash table buckets allowed.
  *                  (must be power of two)

Best wishes, Duncan.

On 18/11/13 17:20, Mathieu Desnoyers wrote:
> Hi,
>
> Paul McKenney, Lai Jianshan, Josh Triplett and myself just published a series of articles on Userspace RCU on Linux Weekly News. You can find the top-level article at this URL:
>
> https://lwn.net/Articles/573424/
>
> Those articles introduce the Userspace RCU library, explaining how to use RCU and the data structures it contains. Access to those articles is restricted to LWN subscribers for a week after publication, and should be freely available afterward.
>
> Feedback is welcome!
>
> Thanks,
>
> Mathieu
>

[lttng-dev] New article about Userspace RCU on LWN

[Mathieu Desnoyers]

----- Original Message -----
> From: "Duncan Sands" <baldrick@free.fr>
> To: lttng-dev at lists.lttng.org
> Sent: Tuesday, November 19, 2013 3:50:39 AM
> Subject: Re: [lttng-dev] New article about Userspace RCU on LWN
> 
> Hi Mathieu, nice articles, now I can point my co-workers at it when they ask
> me
> what this RCU stuff is all about :)  I noticed that the article
>   http://lwn.net/Articles/573431/
> says
> 
> "The hash table can then be allocated:
> 
>      ht = cds_lfht_new(1, 1, 0, CDS_LFHT_AUTO_RESIZE, NULL);
>   The first 1 specifies the initial number of hash buckets in the table, the
>   second 1 specifies the minimum number of hash buckets, and the 0 specifies
>   the
>   maximum number of hash buckets. All three quantities must be powers of two,
>   except for the special case of 0 for the third argument, which specifies an
>   unlimited maximum number of hash buckets."
> 
> However the rculfhash.h header doesn't say that the third argument can be
> zero.
> All it says is:
> 
>   * @max_nr_buckets: the maximum number of hash table buckets allowed.
>   *                  (must be power of two)

Hi Duncan,

I'm glad you like the paper! Indeed, this info was missing from the source code. I just pushed a commit that fixes things up.

Thanks!

Mathieu

> 
> Best wishes, Duncan.
> 
> On 18/11/13 17:20, Mathieu Desnoyers wrote:
> > Hi,
> >
> > Paul McKenney, Lai Jianshan, Josh Triplett and myself just published a
> > series of articles on Userspace RCU on Linux Weekly News. You can find the
> > top-level article at this URL:
> >
> > https://lwn.net/Articles/573424/
> >
> > Those articles introduce the Userspace RCU library, explaining how to use
> > RCU and the data structures it contains. Access to those articles is
> > restricted to LWN subscribers for a week after publication, and should be
> > freely available afterward.
> >
> > Feedback is welcome!
> >
> > Thanks,
> >
> > Mathieu
> >
> 
> 
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
> 

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com