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

["Jan Beulich" <JBeulich@xxxxxxxx>]

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
06: allow efficient allocation of multiple CPU masks at once

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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