Re: 2.4.10pre7aa1

[Dipankar Sarma]

In article <[e-mail]> you wrote:
> On Mon, 10 Sep 2001 17:54:17 +0200
> Andrea Arcangeli <[e-mail]> wrote:
>> Only in 2.4.10pre7aa1: 00_rcu-1
>> 
>> 	wait_for_rcu and call_rcu implementation (from IBM). I did some
>> 	modifications with respect to the original version from IBM.
>> 	In particular I dropped the vmalloc_rcu/kmalloc_rcu, the
>> 	rcu_head must always be allocated in the data structures, it has
>> 	to be a field of a class, rather than hiding it in the allocation
>> 	and playing dirty and risky with casts on a bigger allocation.

> Hi Andrea, 

> 	Like the kernel threads approach, but AFAICT it won't work for the case of two CPUs running wait_for_rcu at the same time (on a 4-way or above).

The patch I submitted to Andrea had logic to make sure that
two CPUs don't execute wait_for_rcu() at the same time.
Somehow it seems to have got lost in Andrea's modifications.

I will look at that and submit a new patch to Andrea, if necessary.

As for wrappers, I am agnostic. However, I think sooner or later
people will start asking for them, if we go by our past experience.

Thanks
Dipankar
-- 
Dipankar Sarma  <[e-mail]> Project: http://lse.sourceforge.net
Linux Technology Center, IBM Software Lab, Bangalore, India.