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Re: [PATCH 0/3] Reorg ppc64 pmu insn counting


From: Daniel Henrique Barboza
Subject: Re: [PATCH 0/3] Reorg ppc64 pmu insn counting
Date: Thu, 23 Dec 2021 19:47:48 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.4.0



On 12/23/21 18:19, Richard Henderson wrote:
On 12/23/21 12:36 PM, Daniel Henrique Barboza wrote:
This reorg is breaking PMU-EBB tests, unfortunately. These tests are run from 
the kernel
tree [1] and I test them inside a pSeries TCG guest. You'll need to apply 
patches 9 and
10 of [2] beforehand (they apply cleanly in current master) because they aren't 
upstream
yet and EBB needs it.

The tests that are breaking consistently with this reorg are:

back_to_back_ebbs_test.c
cpu_event_pinned_vs_ebb_test.c
cycles_test.c
task_event_pinned_vs_ebb_test.c

In which case perhaps drop my first patch for now, and instead simply replicate 
your tcg algorithm in c exactly -- using none of the helpers that currently 
exist.

We can improve the code, and the use of pmc_get_event from 
hreg_compute_hregs_value second.


I'll try this out. I'll let you know how that goes.


Thanks,


Daniel



r~



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