[LTP] getrusage03: account for percpu RSS counter batching

[linuxtestproject.agent@gmail.com]

Hi Nirmoy,

On 2026-10-02, Nirmoy Das wrote:
> getrusage03: account for percpu RSS counter batching

> 	long online_cpus = tst_ncpus();
> 	long batch = MAX(32L, online_cpus * 2);

Medium: On musl, tst_ncpus() counts the calling thread's affinity mask,
so an inherited taskset/cpuset restriction still underestimates the kernel's
global batch even before pinning. With 352 online CPUs, 64 KiB pages and
single-CPU inherited affinity, this chooses 20 MiB rather than 44 MiB and
rejects a valid 270336 KiB result for the 300 MiB allocation. Obtain the
system-wide online count independently of affinity, for example by counting
the CPU ranges in /sys/devices/system/cpu/online.

Verdict - Needs revision

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