Re: [PATCH v2 1/2] perf tools: Fix record failure when mixed with ARM SPE event

From: Leo Yan <leo.yan@linaro.org>
To: Wei Li <liwei391@huawei.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Mike Leach <mike.leach@linaro.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Kim Phillips <kim.phillips@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	guohanjun@huawei.com
Subject: Re: [PATCH v2 1/2] perf tools: Fix record failure when mixed with ARM SPE event
Date: Fri, 24 Jul 2020 16:59:11 +0800	[thread overview]
Message-ID: <20200724085911.GA8487@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20200724071111.35593-2-liwei391@huawei.com>

On Fri, Jul 24, 2020 at 03:11:10PM +0800, Wei Li wrote:
> When recording with cache-misses and arm_spe_x event, i found that
> it will just fail without showing any error info if i put cache-misses
> after 'arm_spe_x' event.
> 
> [root@localhost 0620]# perf record -e cache-misses -e \
> arm_spe_0/ts_enable=1,pct_enable=1,pa_enable=1,load_filter=1,\
> jitter=1,store_filter=1,min_latency=0/ sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.067 MB perf.data ]
> [root@localhost 0620]# perf record -e \
> arm_spe_0/ts_enable=1,pct_enable=1,pa_enable=1,load_filter=1,jitter=1,\
> store_filter=1,min_latency=0/ -e cache-misses sleep 1
> [root@localhost 0620]#
> 
> The current code can only work if the only event to be traced is an
> 'arm_spe_x', or if it is the last event to be specified. Otherwise the
> last event type will be checked against all the arm_spe_pmus[i]->types,
> none will match and an out of bound 'i' index will be used in
> arm_spe_recording_init().
> 
> We don't support concurrent multiple arm_spe_x events currently, that
> is checked in arm_spe_recording_options(), and it will show the relevant
> info. So add the check and record of the first found 'arm_spe_pmu' to
> fix this issue here.
> 
> Fixes: ffd3d18c20b8d ("perf tools: Add ARM Statistical Profiling Extensions (SPE) support")
> Signed-off-by: Wei Li <liwei391@huawei.com>

Thanks for the patch, Wei.  I have tested this series on Arm64 D06
platform:

Tested-by: Leo Yan <leo.yan@linaro.org>

I'd like to wait for Mathieu's ACK.

Thanks,
Leo

> ---
>  tools/perf/arch/arm/util/auxtrace.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/arch/arm/util/auxtrace.c b/tools/perf/arch/arm/util/auxtrace.c
> index 0a6e75b8777a..28a5d0c18b1d 100644
> --- a/tools/perf/arch/arm/util/auxtrace.c
> +++ b/tools/perf/arch/arm/util/auxtrace.c
> @@ -56,7 +56,7 @@ struct auxtrace_record
>  	struct perf_pmu	*cs_etm_pmu;
>  	struct evsel *evsel;
>  	bool found_etm = false;
> -	bool found_spe = false;
> +	struct perf_pmu *found_spe = NULL;
>  	static struct perf_pmu **arm_spe_pmus = NULL;
>  	static int nr_spes = 0;
>  	int i = 0;
> @@ -74,12 +74,12 @@ struct auxtrace_record
>  		    evsel->core.attr.type == cs_etm_pmu->type)
>  			found_etm = true;
>  
> -		if (!nr_spes)
> +		if (!nr_spes || found_spe)
>  			continue;
>  
>  		for (i = 0; i < nr_spes; i++) {
>  			if (evsel->core.attr.type == arm_spe_pmus[i]->type) {
> -				found_spe = true;
> +				found_spe = arm_spe_pmus[i];
>  				break;
>  			}
>  		}
> @@ -96,7 +96,7 @@ struct auxtrace_record
>  
>  #if defined(__aarch64__)
>  	if (found_spe)
> -		return arm_spe_recording_init(err, arm_spe_pmus[i]);
> +		return arm_spe_recording_init(err, found_spe);
>  #endif
>  
>  	/*
> -- 
> 2.17.1
> 