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SubjectRe: [PATCH RFC] x86 / CPU: Add cpu isolation flag for avoiding disturbance from aperfmperf IPI
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On 25.04.2019 14:45, Peter Zijlstra wrote:
> On Thu, Apr 25, 2019 at 01:46:51PM +0300, Konstantin Khlebnikov wrote:
>> Sensitive workloads like DPDK polling do not like any interrupts.
>>
>> This patch adds flag 'freq' for boot option 'isolcpu': isolcpu=freq,<cpus>.
>>
>> Users like show_cpuinfo() fallback to frequency from generic cpufreq
>> policy if arch-specific requesting method returns 0.
>
> Then don't touch that sysfs file?

What sysfs file?
I mean many applications read /proc/cpuinfo and this triggers IPI to all cpus.

>
> I really hate having an option for just this.
>

This could be generalized to 'isolate cpu from unnecessary IPI'.
Something like mm pagevec drain also could be avoided.

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