Re: [Xen-devel] [PATCH 00/12] cpumask handling scalability improvements

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.10.11 at 09:08, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> On 20/10/2011 14:36, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> 
>> This patch set makes some first steps towards eliminating the old cpumask
>> accessors, replacing them by such that don't require the full NR_CPUS
>> bits to be allocated (which obviously can be pretty wasteful when
>> NR_CPUS is high, but the actual number is low or moderate).
>> 
>> 01: introduce and use nr_cpu_ids and nr_cpumask_bits
>> 02: eliminate cpumask accessors referencing NR_CPUS
>> 03: eliminate direct assignments of CPU masks
>> 04: x86: allocate IRQ actions' cpu_eoi_map dynamically
>> 05: allocate CPU sibling and core maps dynamically
> 
> 01-05/07-12:
> Acked-by: Keir Fraser <keir@xxxxxxx>
> 
>> 06: allow efficient allocation of multiple CPU masks at once
> 
> Not this one.

Okay, I'll re-work (and re-send) it then to use non-array allocations.

Jan

>> One reason I put the following ones together was to reduce the
>> differences between the disassembly of hypervisors built for 4095
>> and 2047 CPUs, which I looked at to determine the places where
>> cpumask_t variables get copied without using cpumask_copy() (a
>> job where grep is of no help). Hence consider these patch optional,
>> but recommended.
>> 
>> 07: cpufreq: allocate CPU masks dynamically
>> 08: x86/p2m: allocate CPU masks dynamically
>> 09: cpupools: allocate CPU masks dynamically
>> 10: credit: allocate CPU masks dynamically
>> 11: x86/hpet: allocate CPU masks dynamically
>> 12: cpumask <=> xenctl_cpumap: allocate CPU masks and byte maps dynamically
>> 
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> 
>> 
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>> http://lists.xensource.com/xen-devel 




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