Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

On Sun, Mar 18, 2018 at 10:14 AM kbuild test robot wrote: > Hi Eric, > Thank you for the patch! Yet something to improve: > [auto build test ERROR on linus/master] > [also build test ERROR on v4.16-rc5 next-20180316] > [if your patch is applied to the wrong git tree, please

Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

On Sun, Mar 18, 2018 at 10:14 AM kbuild test robot wrote: > Hi Eric, > Thank you for the patch! Yet something to improve: > [auto build test ERROR on linus/master] > [also build test ERROR on v4.16-rc5 next-20180316] > [if your patch is applied to the wrong git tree, please drop us a note to

Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

Hi Eric, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc5 next-20180316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

Hi Eric, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc5 next-20180316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

Hi Eric, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc5 next-20180316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

Re: [PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

Hi Eric, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc5 next-20180316] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

[PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

I noticed high latencies caused by a daemon periodically reading various MSR on all cpus. KASAN kernels would see ~10ms latencies simply reading one MSR. Even without KASAN, sending IPI to CPU in deep sleep state or blocking hard IRQ in a a long section, then waiting for the answer can consume

[PATCH 1/2] x86, msr: add rdmsr_safe_on_cpu_resched() and use it in msr_read()

I noticed high latencies caused by a daemon periodically reading various MSR on all cpus. KASAN kernels would see ~10ms latencies simply reading one MSR. Even without KASAN, sending IPI to CPU in deep sleep state or blocking hard IRQ in a a long section, then waiting for the answer can consume