[RFC][CFT] GEOM direct dispatch and fine-grained CAM locking

[Nathan Whitehorn]

On 09/04/13 02:01, Alexander Motin wrote:
> On 04.09.2013 00:48, Olivier Cochard-Labbé wrote:
>> On Tue, Sep 3, 2013 at 8:10 PM, Outback Dingo 
>> <outbackdingo at gmail.com> wrote:
>>> Can anyone confirm how well tested/stable this patch set might be?? if
>>> theres positive input i have a zoo of dev machines i could load it 
>>> on, to
>>> help further it.
>>> Just checking to see how widely its been tested,
>>
>> I've installed this patch on 3 differents machines there status after
>> about 12hours:
>> - SUN FIRE X4170 M2 (amd64: r255178) with 6 SAS harddrives in one big
>> zraid (LSI MegaSAS Gen2 controller): Used for generating package with
>> poudriere… no probleme since;
>> - HAL/Fujitsu SPARC64-V (sparc64: r255178) with two SCSI-3 disks in
>> gmirror: Used for generating package with poudriere too… no probleme
>> since;
>
> I've forgot to mention, but GEOM direct dispatch is now active only on 
> x86 because GET_STACK_USAGE macro now defined only there and I wanted 
> to stay on a safe side. On other archs GEOM works in old queued way. 
> Somebody should port that small macro to other archs. But that is 
> still interesting data point. Thanks.

Could you describe what this macro is supposed to do so that we can do 
the porting work?
-Nathan