Re: [Xen-devel] [PATCH v2 5/5] xen: sched_rt: print useful affinity info when dumping

[Meng Xu <xumengpanda@xxxxxxxxx>]

2015-03-17 11:33 GMT-04:00 Dario Faggioli <dario.faggioli@xxxxxxxxxx>:
> In fact, printing the cpupool's CPU online mask
> for each vCPU is just redundant, as that is the
> same for all the vCPUs of all the domains in the
> same cpupool, while hard affinity is already part
> of the output of dumping domains info.
>
> Instead, print the intersection between hard
> affinity and online CPUs, which is --in case of this
> scheduler-- the effective affinity always used for
> the vCPUs.
>
> This change also takes the chance to add a scratch
> cpumask area, to avoid having to either put one
> (more) cpumask_t on the stack, or dynamically
> allocate it within the dumping routine. (The former
> being bad because hypervisor stack size is limited,
> the latter because dynamic allocations can fail, if
> the hypervisor was built for a large enough number
> of CPUs.)
>
> Such scratch area can be used to kill most of the
> cpumasks{_var}_t local variables in other functions
> in the file, but that is *NOT* done in this chage.
>
> Finally, convert the file to use keyhandler scratch,
> instead of open coded string buffers.
>
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Meng Xu <xumengpanda@xxxxxxxxx>
> Cc: Jan Beulich <JBeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> ---
> Changes from v1:
>  * improved changelog;
>  * made a local variable to point to the correct
>    scratch mask, as suggested during review.
> ---

Reviewed-by: Meng Xu <mengxu@xxxxxxxxxxxxx>

Thanks,

Best,

Meng

-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania

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