Re: 2.4.10pre7aa1

Dipankar Sarma
2001-09-12T10:59:40Z

In article <20010912182440.3975719b.rusty@rustcorp.com.au> you wrote:
> On Mon, 10 Sep 2001 17:54:17 +0200
> Andrea Arcangeli <andrea@suse.de> 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 <dipankar@in.ibm.com> Project: http://lse.sourceforge.net
Linux Technology Center, IBM Software Lab, Bangalore, India.