Re: [Xen-devel] [PATCH] xen: sched: Credit2: avoid looping too much (over runqueues) during load balancing

[Dario Faggioli <dfaggioli@xxxxxxxx>]

On Thu, 2018-10-11 at 15:47 +0200, Dario Faggioli wrote:
> For doing load balancing between runqueues, we check the load of each
> runqueue, select the one more "distant" than our own load, and then
> take
> the proper runq lock and attempt vcpu migrations.
> 
> If we fail to take such lock, we try again, and the idea was to give
> up
> and bail if, during the checking phase, we can't take the lock of any
> runqueue (check the comment near to the 'goto retry;', in the middle
> of
> balance_load())
> 
> However, the variable that controls the "give up and bail" part, is
> not
> reset upon retries. Therefore, provided we did manage to check the
> load of
> at least one runqueue during the first pass, if we can't get any runq
> lock,
> we don't bail, but we try again taking the lock of that same runqueue
> (and that may even more than once).
> 
> Signed-off-by: Dario Faggioli <dfaggioli@xxxxxxxx>
> ---
> Cc: George Dunlap <george.dunlap@xxxxxxxxxx>
>
Ping?

Thanks and Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Software Engineer @ SUSE https://www.suse.com/

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