Messages in this thread |  | | Date | Tue, 3 Apr 2018 12:25:56 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] genirq: only scan the present CPUs |
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On Mon, 2 Apr 2018, Li RongQing wrote:
> lots of application will read /proc/stat, like ps and vmstat, but we > find the reading time are spreading on Purley platform which has lots > of possible CPUs and interrupt. > > To reduce the reading time, only scan the present CPUs, not all possible > CPUs, which speeds the reading of /proc/stat 20 times on Purley platform > which has 56 present CPUs, and 224 possible CPUs
Why is BIOS/ACPI telling the kernel that there are 224 possible CPUs unless it supports physical CPU hotplug.
Thanks,
tglx
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