Patch to optimize "bare" critical sections

[Marcel Moolenaar]

On Nov 23, 2004, at 1:31 PM, John Baldwin wrote:

> On Tuesday 23 November 2004 03:00 pm, John Baldwin wrote:
>> Basically, I have a patch to divorce the interrupt disable/deferring 
>> to
>> only happen inside of spinlocks using a new spinlock_enter/exit() API
>> (where a spinlock_enter/exit includes a critical section as well) but 
>> that
>> plain critical sections won't have to do such a thing.  I've tested 
>> it on
>> i386, alpha, and sparc64 already, and it has also been tested on arm. 
>>  I'm
>> unable to get a cross-built powerpc kernel to link (linker dies with a
>> signal 6), but the compile did finish.  I have cross-compiled ia64 and
>> amd64
>> successfully, but have not run tested due to ENOHARDWARE.  So, I would
>> appreciate it if a few folks could try the patch out on ppc, ia64, and
>> amd64 to make sure it works ok.  Thanks.
>
> *cough*  Ahem, http://www.FreeBSD.org/~jhb/patches/spinlock.patch

No problems on ia64. I haven't loaded the machine to see if I get the
wedge Robert was talking about, but I'm not too worried about that at
the moment.

FYI,

-- 
  Marcel Moolenaar         USPA: A-39004          marcel at xcllnt.net