Re: [PATCH V7 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE_SIZE

[Liang, Kan]

On 9/17/2020 6:02 PM, Dave Hansen wrote:
> > The problem is that the warning from the perf tool usually includes some
> > hints regarding the cause of the warning or possible solution to
> > workaround/fix the warning. What message should we deliver to the users?
> > "Warning: Too many error page size. Address space isolation feature may
> > be enabled, please check"?
> That's not particularly actionable for an end user.  Do any of the perf
> errors just tell them to submit a bug report?  "Excessive number of page
> size lookup errors, please report to..."

Yes, found some perf tool warnings end with "Consider reporting to 
linux-kernel@xxxxxxxxxxxxxxx."

I will add a warning "Excessive number of page size lookup errors, 
please report to linux-kernel@xxxxxxxxxxxxxxx.", if 90% of the samples 
have the page size 0.

Thanks,
Kan