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832df3d47b
Nadav noticed that the cpumask allocations in native_send_call_func_ipi() are noticeable in microbenchmarks. Use the new cpumask_or_equal() function to simplify the decision whether the supplied target CPU mask is either equal to cpu_online_mask or equal to cpu_online_mask except for the CPU on which the function is invoked. cpumask_or_equal() or's the target mask and the cpumask of the current CPU together and compares it to cpu_online_mask. If the result is false, use the mask based IPI function, otherwise check whether the current CPU is set in the target mask and invoke either the send_IPI_all() or the send_IPI_allbutselt() APIC callback. Make the shorthand decision also depend on the static key which enables shorthand mode. That allows to remove the extra cpumask comparison with cpu_callout_mask. Reported-by: Nadav Amit <namit@vmware.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20190722105220.768238809@linutronix.de |
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| boot | ||
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| crypto | ||
| entry | ||
| events | ||
| hyperv | ||
| ia32 | ||
| include | ||
| kernel | ||
| kvm | ||
| lib | ||
| math-emu | ||
| mm | ||
| net | ||
| oprofile | ||
| pci | ||
| platform | ||
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| purgatory | ||
| ras | ||
| realmode | ||
| tools | ||
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| xen | ||
| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||
| Makefile.um | ||