linux-kernel - [PATCH v1 05/11] perf mem: Support AUX trace

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Message-Id: <20200806024041.27475-6-leo.yan@linaro.org>
Date:   Thu,  6 Aug 2020 10:40:35 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ian Rogers <irogers@...gle.com>,
        Kemeng Shi <shikemeng@...wei.com>,
        James Clark <james.clark@....com>,
        Wei Li <liwei391@...wei.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Al Grant <Al.Grant@....com>, linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v1 05/11] perf mem: Support AUX trace

Perf memory profiling doesn't support aux trace data so the tool cannot
receive the synthesized samples from hardware tracing data.  On the
Arm64 platform, though it doesn't support PMU events for memory load and
store, but Armv8's SPE is a good candidate for memory profiling, the
hardware tracer can record memory accessing operations with physical
address and virtual address for different cache level and it also stats
the memory operations for remote access and TLB.

To allow the perf memory tool to support AUX trace, this patches adds
the aux callbacks for session structure.  It passes the predefined synth
options (like llc, flc, remote_access, tlb, etc) so this notifies the
tracing decoder to generate corresponding samples.  This patch also
invokes the standard API perf_event__process_attr() to register sample
IDs into evlist.

Signed-off-by: Leo Yan <leo.yan@...aro.org>
---
 tools/perf/builtin-mem.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index a7204634893c..6c8b5e956a4a 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -7,6 +7,7 @@
 #include "perf.h"
 
 #include <subcmd/parse-options.h>
+#include "util/auxtrace.h"
 #include "util/trace-event.h"
 #include "util/tool.h"
 #include "util/session.h"
@@ -249,6 +250,15 @@ static int process_sample_event(struct perf_tool *tool,
 
 static int report_raw_events(struct perf_mem *mem)
 {
+	struct itrace_synth_opts itrace_synth_opts = {
+		.set = true,
+		.flc = true,		/* First level cache samples */
+		.llc = true,		/* Last level cache samples */
+		.tlb = true,		/* TLB samples */
+		.remote_access = true,	/* Remote access samples */
+		.default_no_sample = true,
+	};
+
 	struct perf_data data = {
 		.path  = input_name,
 		.mode  = PERF_DATA_MODE_READ,
@@ -261,6 +271,8 @@ static int report_raw_events(struct perf_mem *mem)
 	if (IS_ERR(session))
 		return PTR_ERR(session);
 
+	session->itrace_synth_opts = &itrace_synth_opts;
+
 	if (mem->cpu_list) {
 		ret = perf_session__cpu_bitmap(session, mem->cpu_list,
 					       mem->cpu_bitmap);
@@ -394,6 +406,19 @@ parse_mem_ops(const struct option *opt, const char *str, int unset)
 	return ret;
 }
 
+static int process_attr(struct perf_tool *tool __maybe_unused,
+			union perf_event *event,
+			struct evlist **pevlist)
+{
+	int err;
+
+	err = perf_event__process_attr(tool, event, pevlist);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 int cmd_mem(int argc, const char **argv)
 {
 	struct stat st;
@@ -405,8 +430,12 @@ int cmd_mem(int argc, const char **argv)
 			.comm		= perf_event__process_comm,
 			.lost		= perf_event__process_lost,
 			.fork		= perf_event__process_fork,
+			.attr		= process_attr,
 			.build_id	= perf_event__process_build_id,
 			.namespaces	= perf_event__process_namespaces,
+			.auxtrace_info  = perf_event__process_auxtrace_info,
+			.auxtrace       = perf_event__process_auxtrace,
+			.auxtrace_error = perf_event__process_auxtrace_error,
 			.ordered_events	= true,
 		},
 		.input_name		 = "perf.data",
-- 
2.17.1