linux-kernel - Re: [PATCH v1 4/6] perf auxtrace: Iterate all AUX events when finish reading

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9f08c5cb-fb4b-4994-9128-0484aa6c06d7@intel.com>
Date: Mon, 22 Jul 2024 14:13:43 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Leo Yan <leo.yan@....com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
 James Clark <james.clark@...aro.org>,
 Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach
 <mike.leach@...aro.org>, John Garry <john.g.garry@...cle.com>,
 Will Deacon <will@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
 Mark Rutland <mark.rutland@....com>, coresight@...ts.linaro.org,
 linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 4/6] perf auxtrace: Iterate all AUX events when finish
 reading

On 21/07/24 23:21, Leo Yan wrote:
> When finished to read AUX trace data from mmaped buffer, based on the
> AUX buffer index the core layer needs to search the corresponding PMU
> event and re-enable it to continue tracing.
> 
> However, current code only searches the first AUX event. It misses to
> search other enabled AUX events, thus, it returns failure if the buffer
> index does not belong to the first AUX event.
> 
> This patch extends the auxtrace_record__read_finish() function to
> search for every enabled AUX events, so all the mmaped buffer indexes
> can be covered.
> 
> Signed-off-by: Leo Yan <leo.yan@....com>
> ---
>  tools/perf/util/auxtrace.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
> index e2f317063eec..95be330d7e10 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -670,18 +670,25 @@ static int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel,
>  int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
>  {
>  	struct evsel *evsel;
> +	int ret = -EINVAL;
>  
>  	if (!itr->evlist || !itr->pmu)
>  		return -EINVAL;
>  
>  	evlist__for_each_entry(itr->evlist, evsel) {
> -		if (evsel->core.attr.type == itr->pmu->type) {
> +		if (evsel__is_aux_event(evsel)) {

If the type is the same, then there is no need to
change the logic here?

Otherwise, maybe that should be a separate patch

>  			if (evsel->disabled)
> -				return 0;
> -			return evlist__enable_event_idx(itr->evlist, evsel, idx);
> +				continue;
> +			ret = evlist__enable_event_idx(itr->evlist, evsel, idx);
> +			if (ret >= 0)

Should this be:

			if (ret < 0)

> +				return ret;

And will need a common error path for the pr_err() below.

>  		}
>  	}
> -	return -EINVAL;
> +
> +	if (ret < 0)
> +		pr_err("Failed to event enable event (idx=%d): %d\n", idx, ret);
> +
> +	return ret;
>  }
>  
>  /*