Re: [RFC PATCH] sched: smart wake-affine

[Michael Wang <wangyun@linux.vnet.ibm.com>]

On 06/03/2013 11:09 AM, Mike Galbraith wrote:
> On Mon, 2013-06-03 at 10:28 +0800, Michael Wang wrote: 
>> On 05/28/2013 01:05 PM, Michael Wang wrote:
>>> wake-affine stuff is always trying to pull wakee close to waker, by theory,
>>> this will bring benefit if waker's cpu cached hot data for wakee, or the
>>> extreme ping-pong case.
>>>
>>> And testing show it could benefit hackbench 15% at most.
>>>
>>> However, the whole stuff is somewhat blindly and time-consuming, some
>>> workload therefore suffer.
>>>
>>> And testing show it could damage pgbench 50% at most.
>>>
>>> Thus, wake-affine stuff should be smarter, and realise when to stop
>>> it's thankless effort.
>>
>> Is there any comments?
> 
> (I haven't had time to test-drive yet, -rt munches time like popcorn)

I see ;-)

During my testing, this one works well on the box, solved the issues of
pgbench and won't harm hackbench any, I think we have caught some good
point here :)

Regards,
Michael Wang

> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>