linux-kernel - Re: [PATCH V3 3/3] perf test: Support the retire

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Message-ID: <Y+EbZ8FFWj6t60Cb@kernel.org>
Date:   Mon, 6 Feb 2023 12:23:19 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     kan.liang@...ux.intel.com
Cc:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        eranian@...gle.com, irogers@...gle.com
Subject: Re: [PATCH V3 3/3] perf test: Support the retire_lat check

Em Mon, Feb 06, 2023 at 12:01:44PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Feb 02, 2023 at 11:22:09AM -0800, kan.liang@...ux.intel.com escreveu:
> > From: Kan Liang <kan.liang@...ux.intel.com>
> > 
> > Add test for the new field for Retire Latency in the X86 specific test.
> 
> Is this passing 'perf test' for you?
> 
> [root@...co ~]# perf test -v "x86 sample parsing"
>  74: x86 Sample parsing                                              :
> --- start ---
> test child forked, pid 72526
> Samples differ at 'retire_lat'
> parsing failed for sample_type 0x1000000
> test child finished with -1
> ---- end ----
> x86 Sample parsing: FAILED!
> [root@...co ~]#

In tools/perf/arch/x86/util/event.c  you have:

void arch_perf_parse_sample_weight(struct perf_sample *data,
                                   const __u64 *array, u64 type)
{
        union perf_sample_weight weight;

        weight.full = *array;
        if (type & PERF_SAMPLE_WEIGHT)
                data->weight = weight.full;
        else {
                data->weight = weight.var1_dw;
                data->ins_lat = weight.var2_w;
                data->retire_lat = weight.var3_w;
        }
}

void arch_perf_synthesize_sample_weight(const struct perf_sample *data,
                                        __u64 *array, u64 type)
{
        *array = data->weight;

        if (type & PERF_SAMPLE_WEIGHT_STRUCT) {
                *array &= 0xffffffff;
                *array |= ((u64)data->ins_lat << 32);
        }
}

didn't you forget to encode data->retire_lat at
arch_perf_synthesize_sample_weight()?

- Arnaldo

> > Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
> > ---
> > 
> > New patch since V2
> > 
> >  tools/perf/arch/x86/tests/sample-parsing.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/arch/x86/tests/sample-parsing.c b/tools/perf/arch/x86/tests/sample-parsing.c
> > index 690c7c07e90d..a061e8619267 100644
> > --- a/tools/perf/arch/x86/tests/sample-parsing.c
> > +++ b/tools/perf/arch/x86/tests/sample-parsing.c
> > @@ -27,8 +27,10 @@ static bool samples_same(const struct perf_sample *s1,
> >  			 const struct perf_sample *s2,
> >  			 u64 type)
> >  {
> > -	if (type & PERF_SAMPLE_WEIGHT_STRUCT)
> > +	if (type & PERF_SAMPLE_WEIGHT_STRUCT) {
> >  		COMP(ins_lat);
> > +		COMP(retire_lat);
> > +	}
> >  
> >  	return true;
> >  }
> > @@ -48,6 +50,7 @@ static int do_test(u64 sample_type)
> >  	struct perf_sample sample = {
> >  		.weight		= 101,
> >  		.ins_lat        = 102,
> > +		.retire_lat     = 103,
> >  	};
> >  	struct perf_sample sample_out;
> >  	size_t i, sz, bufsz;
> > -- 
> > 2.35.1
> > 
> 
> -- 
> 
> - Arnaldo

-- 

- Arnaldo