Re: [PATCH 15/17] kernel/cpu: add num_active_cpu counter
From: Peter Zijlstra <peterz@infradead.org>
Date: 2021-12-21 13:14:14
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kvm, linux-alpha, linux-mips, linux-mm, linux-perf-users, linux-riscv, linux-s390, linuxppc-dev, lkml
On Sat, Dec 18, 2021 at 01:20:11PM -0800, Yury Norov wrote:
Similarly to the online cpus, the cpu_active_mask is actively used in the kernel. This patch adds a counter for active cpus, so that users that call num_active_cpus() would know the result immediately, instead of calling the bitmap_weight for the mask.
Who cares about num_active_cpus() ?
+EXPORT_SYMBOL(set_cpu_active);
NAK, this should *never*ever* be used from a module.