Re: [PATCH 0/5] Reduce cross CPU IPI interference

From: Chris Metcalf
Date: Sun Oct 02 2011 - 10:59:07 EST

On 10/2/2011 4:44 AM, Gilad Ben-Yossef wrote:
>> We have some code in our tree (not yet
>> returned to the community) that tries to deal with some sources of interrupt
>> jitter on tiles that are running isolcpu and want to be 100% in user space.
> Yes, I think this work will benefit this kind of use case (CPU/user
> space bound on a dedicated CPU)
> the most, although other use cases can benefit as well (e.g. power
> management with idle cores).
> Btw, do you have any plan to share the patches you mentioned? it could
> save me a lot of time. Not wanting to
> re-invent the wheel and all that...

I'd like to, but getting the patch put together cleanly is still on my list
behind a number of other things (glibc community return, kernel catch-up
with a backlog of less controversial changes, customer crises, enhancements
targeted to forthcoming releases, etc.; I'm sure you know the drill...)

>>> This first version creates an on_each_cpu_mask infrastructure API (derived
>>> from
>>> existing arch specific versions in Tile and Arm) and uses it to turn two
>>> global
>>> IPI invocation to per CPU group invocations.
>> The global version looks fine; I would probably make on_each_cpu() an inline
>> in the !SMP case now that you are (correctly, I suspect) disabling
>> interrupts when calling the function.
> Good point. Will do.
> I will take this email as an ACK to the tile relevant changes, if that
> is OK with you.

Yes, definitely.

Acked-by: Chris Metcalf <cmetcalf@xxxxxxxxxx>

Chris Metcalf, Tilera Corp.

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