linux-kernel - [RFC 2/4] perf tool: Refactor perf_event__synthesize

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]

Date:   Tue, 10 Jan 2023 11:28:57 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     <acme@...nel.org>
CC:     <ravi.bangoria@....com>, <jolsa@...nel.org>, <namhyung@...nel.org>,
        <irogers@...gle.com>, <kan.liang@...ux.intel.com>,
        <peterz@...radead.org>, <mark.rutland@....com>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <james.clark@....com>,
        <german.gomez@....com>, <leo.yan@...aro.org>,
        <adrian.hunter@...el.com>, <alexey.v.bayduraev@...ux.intel.com>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sandipan.das@....com>, <ananth.narayan@....com>,
        <santosh.shukla@....com>
Subject: [RFC 2/4] perf tool: Refactor perf_event__synthesize_modules()

perf_event__synthesize_modules() synthesizes MMAP2 and MMAP events.
Split them into separate functions.

Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
---
 tools/perf/util/synthetic-events.c | 77 +++++++++++++++++++-----------
 1 file changed, 48 insertions(+), 29 deletions(-)

diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 3ab6a92b1a6d..2e145517f192 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -665,6 +665,50 @@ int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
 }
 #endif
 
+static void __perf_event__synthesize_modules_mmap2(struct machine *machine,
+						   struct map *map,
+						   union perf_event *event)
+{
+	size_t size = PERF_ALIGN(map->dso->long_name_len + 1, sizeof(u64));
+
+	event->mmap2.header.type = PERF_RECORD_MMAP2;
+	event->mmap2.header.size = sizeof(event->mmap2)
+				   - sizeof(event->mmap2.filename)
+				   + size
+				   + machine->id_hdr_size;
+
+	memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
+	event->mmap2.start = map->start;
+	event->mmap2.len   = map->end - map->start;
+	event->mmap2.pid   = machine->pid;
+
+	memcpy(event->mmap2.filename, map->dso->long_name,
+	       map->dso->long_name_len + 1);
+
+	perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
+}
+
+static void __perf_event__synthesize_modules_mmap(struct machine *machine,
+						  struct map *map,
+						  union perf_event *event)
+{
+	size_t size = PERF_ALIGN(map->dso->long_name_len + 1, sizeof(u64));
+
+	event->mmap.header.type = PERF_RECORD_MMAP;
+	event->mmap.header.size = sizeof(event->mmap)
+				  - sizeof(event->mmap.filename)
+				  + size
+				  + machine->id_hdr_size;
+
+	memset(event->mmap.filename + size, 0, machine->id_hdr_size);
+	event->mmap.start = map->start;
+	event->mmap.len   = map->end - map->start;
+	event->mmap.pid   = machine->pid;
+
+	memcpy(event->mmap.filename, map->dso->long_name,
+	       map->dso->long_name_len + 1);
+}
+
 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 				   struct machine *machine)
 {
@@ -695,35 +739,10 @@ int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t
 		if (!__map__is_kmodule(pos))
 			continue;
 
-		if (symbol_conf.buildid_mmap2) {
-			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
-			event->mmap2.header.type = PERF_RECORD_MMAP2;
-			event->mmap2.header.size = (sizeof(event->mmap2) -
-						(sizeof(event->mmap2.filename) - size));
-			memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
-			event->mmap2.header.size += machine->id_hdr_size;
-			event->mmap2.start = pos->start;
-			event->mmap2.len   = pos->end - pos->start;
-			event->mmap2.pid   = machine->pid;
-
-			memcpy(event->mmap2.filename, pos->dso->long_name,
-			       pos->dso->long_name_len + 1);
-
-			perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
-		} else {
-			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
-			event->mmap.header.type = PERF_RECORD_MMAP;
-			event->mmap.header.size = (sizeof(event->mmap) -
-						(sizeof(event->mmap.filename) - size));
-			memset(event->mmap.filename + size, 0, machine->id_hdr_size);
-			event->mmap.header.size += machine->id_hdr_size;
-			event->mmap.start = pos->start;
-			event->mmap.len   = pos->end - pos->start;
-			event->mmap.pid   = machine->pid;
-
-			memcpy(event->mmap.filename, pos->dso->long_name,
-			       pos->dso->long_name_len + 1);
-		}
+		if (symbol_conf.buildid_mmap2)
+			__perf_event__synthesize_modules_mmap2(machine, pos, event);
+		else
+			__perf_event__synthesize_modules_mmap(machine, pos, event);
 
 		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 			rc = -1;
-- 
2.39.0