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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-17 10:32:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-17 10:32:05 -0700 |
| commit | 3cd0462230d806077c709e44af8733795eaa712c (patch) | |
| tree | 1b9cfe66a3d8adf91d4907b01a0b86807d2d669b /arch | |
| parent | Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| parent | cpu/hotplug: Cache number of online CPUs (diff) | |
| download | linux-dev-3cd0462230d806077c709e44af8733795eaa712c.tar.xz linux-dev-3cd0462230d806077c709e44af8733795eaa712c.zip | |
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull CPU hotplug updates from Thomas Gleixner:
"A small update for the SMP hotplug code code:
- Track "booted once" CPUs in a cpumask so the x86 APIC code has an
easy way to decide whether broadcast IPIs are safe to use or not.
- Implement a cpumask_or_equal() helper for the IPI broadcast
evaluation.
The above two changes have been also pulled into the x86/apic
branch for implementing the conditional IPI broadcast feature.
- Cache the number of online CPUs instead of reevaluating it over and
over. num_online_cpus() is an unreliable snapshot anyway except
when it is used outside a cpu hotplug locked region. The cached
access is not changing this, but it's definitely faster than
calculating the bitmap wheight especially in hot paths"
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
cpu/hotplug: Cache number of online CPUs
cpumask: Implement cpumask_or_equal()
smp/hotplug: Track booted once CPUs in a cpumask
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions