tree d360176c1205b605e837d0ac8d008cd944c38314
parent 79f3a53607aff0ff5b28b2eb85a674330ee35f24
author Yabin Cui <yabinc@google.com> 1680814618 -0700
committer Yabin Cui <yabinc@google.com> 1680815485 -0700

simpleperf: Report lost samples in kernel space and user space

Currently we only report total lost samples by default. It's not
clear where the samples are lost and we should increase the size of
which buffer.

To improve it:
1) Calculate records lost in kernel space in RecordStat, instead of
   in RecordCmd.
2) Report lost samples in kernel space and user space separately.
3) Give different warnings for samples lost in kernel space and
   samples lost in user space.

Bug: 276029326
Test: run simpleperf_unit_test
Change-Id: I312175f9b59312f3606f03c0668b9b84e70df0c3