Re: [PATCH v7 18/43] instrumented.h: add KMSAN support

youling 257
2022-10-21T06:39:56Z

PerfTop: 8253 irqs/sec kernel:75.3% exact: 100.0% lost: 0/0 drop:
0/17899 [4000Hz cycles], (all, 8 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

14.87% [kernel] [k] 0xffffffff941d1f37
6.71% [kernel] [k] 0xffffffff942016cf

what is 0xffffffff941d1f37?

2022-10-21 14:16 GMT+08:00, Marco Elver <elver@google.com>:
> On Thu, 20 Oct 2022 at 22:55, youling 257 <youling257@gmail.com> wrote:
>>
>> How to use perf tool?
>
> The simplest would be to try just "perf top" - and see which kernel
> functions consume most CPU cycles. I would suggest you compare both
> kernels, and see if you can spot a function which uses more cycles% in
> the problematic kernel.
>