lkml.org 
[lkml]   [2010]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Microblaze - The fist year
Michael Schnell wrote:
> On 04/13/2010 03:27 PM, Michal Simek wrote:
>>
>> yes, futex is there. You can check it in
>> arch/microblaze/include/asm/futex.h
> Great ! I'll check how this is done.
>>
>>> Does Microblaze MMU Linux support SMP ?
>>
>> It is possible to connect several MicroBlazes but the problem is
>> missing cache coherency modul. I hope that Xilinx will release any
>> version which will support it.
>> We haven't done any significant work to support it but it is expected
>> solution which will happen.
>
> Besides cache coherency, another problem might be doing FUTEX. here (I
> suppose) SMP safe atomic user space operations are necessary. many
> simple RISK (load/store-) CPUs don't provide these (new ARMs provide
> "load-locked / store-conditional" on that behalf as an extension to the
> load/store paradigm. I suppose these can be done in an SMP-safe way,
> supposedly using the hardware that provides cache coherency).
>
I wonder if you could make this work with some variant of NUMA
configuration. I don't predict anything about being practical even if it
works, just a thought.

--
Bill Davidsen <davidsen@tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot


\
 
 \ /
  Last update: 2010-05-09 18:51    [W:0.065 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site