Merge "Support reading vendor categories from file instead of HAL" am: 5bb9e24bef (b65d10fc) · Commits · e / devices / smdk4412 / android_frameworks_native

cmds/atrace/README.md

0 → 100644

+48 −0

Original line number	Diff line number	Diff line
		# Atrace categories

		The atrace command (and the perfetto configuration) allow listing categories
		to select subsets of events to be traced.

		Each category can include some userspace events and some ftrace events.

		## Vendor categories

		It's possible to extend exiting categories (or to define new categories) from
		the /vendor partition in order to add hardware specific ftrace events.

		Since android 14, if the file `/vendor/etc/atrace/atrace_categories.txt`, atrace
		and perfetto will consider the categories and ftrace events listed there.

		The file contains a list of categories, and for each category (on the following
		lines, indented with one or more spaces of time), a list of ftrace events that
		should be enabled when the category is enabled.

		Each ftrace event should be a subdirectory in `/sys/kernel/tracing/events/` and
		should be of the form `group/event`. Listing a whole group is not supported,
		each event needs to be listed explicitly.

		It is not an error if an ftrace event is listed in the file, but not present on
		the tracing file system.

		Example:

		```
		gfx
		mali/gpu_power_state
		mali/mali_pm_status
		thermal_tj
		thermal_exynos/thermal_cpu_pressure
		thermal_exynos/thermal_exynos_arm_update
		```

		The file lists two categories (`gfx` and `thermal_tj`). When the `gfx` category
		is enabled, atrace (or perfetto) will enable
		`/sys/kernel/tracing/events/mali/gpu_power_state` and
		`/sys/kernel/tracing/events/mali/mali_pm_status`. When the `thermal_tj` category
		is enabled, atrace (or perfetto) will enable
		`/sys/kernel/tracing/events/thermal_exynos/thermal_cpu_pressure` and
		`/sys/kernel/tracing/events/thermal_exynos/thermal_exynos_arm_update`.

		Since android 14, if the file `/vendor/etc/atrace/atrace_categories.txt` exists
		on the file system, perfetto and atrace do not query the android.hardware.atrace
		HAL (which is deprecated).

cmds/atrace/atrace.cpp

+104 −28

Original line number	Diff line number	Diff line
		@@ -49,6 +49,7 @@
		#include <android-base/file.h>
		#include <android-base/macros.h>
		#include <android-base/properties.h>
		#include <android-base/strings.h>
		#include <android-base/stringprintf.h>

		using namespace android;
		@@ -73,6 +74,8 @@ const char* k_coreServiceCategory = "core_services";
		const char* k_pdxServiceCategory = "pdx";
		const char* k_coreServicesProp = "ro.atrace.core.services";

		const char* kVendorCategoriesPath = "/vendor/etc/atrace/atrace_categories.txt";

		typedef enum { OPT, REQ } requiredness;

		struct TracingCategory {
		@@ -255,7 +258,20 @@ static const TracingCategory k_categories[] = {
		} },
		};

		struct TracingVendorCategory {
		// A category in the vendor categories file.
		struct TracingVendorFileCategory {
		// The name identifying the category.
		std::string name;

		// If the category is enabled through command.
		bool enabled = false;

		// Paths to the ftrace enable files (relative to g_traceFolder).
		std::vector<std::string> ftrace_enable_paths;
		};

		// A category in the vendor HIDL HAL.
		struct TracingVendorHalCategory {
		// The name identifying the category.
		std::string name;

		@@ -265,11 +281,8 @@ struct TracingVendorCategory {
		// If the category is enabled through command.
		bool enabled;

		TracingVendorCategory(string &&name, string &&description, bool enabled)
		: name(std::move(name))
		, description(std::move(description))
		, enabled(enabled)
		{}
		TracingVendorHalCategory(string&& name, string&& description, bool enabled)
		: name(std::move(name)), description(std::move(description)), enabled(enabled) {}
		};

		/* Command line options */
		@@ -289,8 +302,9 @@ static bool g_tracePdx = false;
		static bool g_traceAborted = false;
		static bool g_categoryEnables[arraysize(k_categories)] = {};
		static std::string g_traceFolder;
		static std::vector<TracingVendorFileCategory> g_vendorFileCategories;
		static sp<IAtraceDevice> g_atraceHal;
		static std::vector<TracingVendorCategory> g_vendorCategories;
		static std::vector<TracingVendorHalCategory> g_vendorHalCategories;

		/* Sys file paths */
		static const char* k_traceClockPath =
		@@ -647,6 +661,13 @@ static bool disableKernelTraceEvents() {
		}
		}
		}
		for (const TracingVendorFileCategory& c : g_vendorFileCategories) {
		for (const std::string& path : c.ftrace_enable_paths) {
		if (fileIsWritable(path.c_str())) {
		ok &= setKernelOptionEnable(path.c_str(), false);
		}
		}
		}
		return ok;
		}

		@@ -726,7 +747,13 @@ static bool setKernelTraceFuncs(const char* funcs)
		static bool setCategoryEnable(const char* name)
		{
		bool vendor_found = false;
		for (auto &c : g_vendorCategories) {
		for (auto& c : g_vendorFileCategories) {
		if (strcmp(name, c.name.c_str()) == 0) {
		c.enabled = true;
		vendor_found = true;
		}
		}
		for (auto& c : g_vendorHalCategories) {
		if (strcmp(name, c.name.c_str()) == 0) {
		c.enabled = true;
		vendor_found = true;
		@@ -872,6 +899,16 @@ static bool setUpKernelTracing()
		}
		}

		for (const TracingVendorFileCategory& c : g_vendorFileCategories) {
		if (c.enabled) {
		for (const std::string& path : c.ftrace_enable_paths) {
		if (fileIsWritable(path.c_str())) {
		ok &= setKernelOptionEnable(path.c_str(), true);
		}
		}
		}
		}

		return ok;
		}

		@@ -1057,7 +1094,10 @@ static void listSupportedCategories()
		printf(" %10s - %s\n", c.name, c.longname);
		}
		}
		for (const auto &c : g_vendorCategories) {
		for (const auto& c : g_vendorFileCategories) {
		printf(" %10s - (VENDOR)\n", c.name.c_str());
		}
		for (const auto& c : g_vendorHalCategories) {
		printf(" %10s - %s (HAL)\n", c.name.c_str(), c.description.c_str());
		}
		}
		@@ -1116,8 +1156,38 @@ bool findTraceFiles()
		return true;
		}

		void initVendorCategories()
		{
		void initVendorCategoriesFromFile() {
		std::ifstream is(kVendorCategoriesPath);
		for (std::string line; std::getline(is, line);) {
		if (line.empty()) {
		continue;
		}
		if (android::base::StartsWith(line, ' ') \|\| android::base::StartsWith(line, '\t')) {
		if (g_vendorFileCategories.empty()) {
		fprintf(stderr, "Malformed vendor categories file\n");
		exit(1);
		return;
		}
		std::string_view path = std::string_view(line).substr(1);
		while (android::base::StartsWith(path, ' ') \|\| android::base::StartsWith(path, '\t')) {
		path.remove_prefix(1);
		}
		if (path.empty()) {
		continue;
		}
		std::string enable_path = "events/";
		enable_path += path;
		enable_path += "/enable";
		g_vendorFileCategories.back().ftrace_enable_paths.push_back(std::move(enable_path));
		} else {
		TracingVendorFileCategory cat;
		cat.name = line;
		g_vendorFileCategories.push_back(std::move(cat));
		}
		}
		}

		void initVendorCategoriesFromHal() {
		g_atraceHal = IAtraceDevice::getService();

		if (g_atraceHal == nullptr) {
		@@ -1125,11 +1195,10 @@ void initVendorCategories()
		return;
		}

		Return<void> ret = g_atraceHal->listCategories(
		[](const auto& list) {
		g_vendorCategories.reserve(list.size());
		Return<void> ret = g_atraceHal->listCategories([](const auto& list) {
		g_vendorHalCategories.reserve(list.size());
		for (const auto& category : list) {
		g_vendorCategories.emplace_back(category.name, category.description, false);
		g_vendorHalCategories.emplace_back(category.name, category.description, false);
		}
		});
		if (!ret.isOk()) {
		@@ -1137,15 +1206,23 @@ void initVendorCategories()
		}
		}

		static bool setUpVendorTracing()
		{
		void initVendorCategories() {
		// If kVendorCategoriesPath exists on the filesystem, do not use the HAL.
		if (access(kVendorCategoriesPath, F_OK) != -1) {
		initVendorCategoriesFromFile();
		} else {
		initVendorCategoriesFromHal();
		}
		}

		static bool setUpVendorTracingWithHal() {
		if (g_atraceHal == nullptr) {
		// No atrace HAL
		return true;
		}

		std::vector<hidl_string> categories;
		for (const auto &c : g_vendorCategories) {
		for (const auto& c : g_vendorHalCategories) {
		if (c.enabled) {
		categories.emplace_back(c.name);
		}
		@@ -1166,15 +1243,14 @@ static bool setUpVendorTracing()
		return true;
		}

		static bool cleanUpVendorTracing()
		{
		static bool cleanUpVendorTracingWithHal() {
		if (g_atraceHal == nullptr) {
		// No atrace HAL
		return true;
		}

		if (!g_vendorCategories.size()) {
		// No vendor categories
		if (!g_vendorHalCategories.size()) {
		// No vendor HAL categories
		return true;
		}

		@@ -1328,7 +1404,7 @@ int main(int argc, char **argv)

		if (ok && traceStart && !onlyUserspace) {
		ok &= setUpKernelTracing();
		ok &= setUpVendorTracing();
		ok &= setUpVendorTracingWithHal();
		ok &= startTrace();
		}

		@@ -1399,7 +1475,7 @@ int main(int argc, char **argv)
		if (traceStop) {
		cleanUpUserspaceTracing();
		if (!onlyUserspace) {
		cleanUpVendorTracing();
		cleanUpVendorTracingWithHal();
		cleanUpKernelTracing();
		}
		}