Add disk I/O tracing. (ac9453d8) · Commits · e / os / platform_frameworks_native

cmds/atrace/Android.mk

+1 −0

Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@ include $(CLEAR_VARS)
		LOCAL_SRC_FILES:= atrace.c

		LOCAL_C_INCLUDES += external/zlib
		LOCAL_CFLAGS += -std=c99

		LOCAL_MODULE:= atrace

cmds/atrace/atrace.c

+33 −1

Original line number	Diff line number	Diff line
		@@ -25,11 +25,14 @@
		#include <time.h>
		#include <zlib.h>

		#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))

		/* Command line options */
		static int g_traceDurationSeconds = 5;
		static bool g_traceSchedSwitch = false;
		static bool g_traceCpuFrequency = false;
		static bool g_traceCpuIdle = false;
		static bool g_traceDisk = false;
		static bool g_traceGovernorLoad = false;
		static bool g_traceWorkqueue = false;
		static bool g_traceOverwrite = false;
		@@ -64,6 +67,13 @@ static const char* k_governorLoadEnablePath =
		static const char* k_workqueueEnablePath =
		"/sys/kernel/debug/tracing/events/workqueue/enable";

		static const char* k_diskEnablePaths[] = {
		"/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable",
		"/sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable",
		"/sys/kernel/debug/tracing/events/block/block_rq_issue/enable",
		"/sys/kernel/debug/tracing/events/block/block_rq_complete/enable",
		};

		static const char* k_tracingOnPath =
		"/sys/kernel/debug/tracing/tracing_on";

		@@ -102,6 +112,16 @@ static bool setKernelOptionEnable(const char* filename, bool enable)
		return writeStr(filename, enable ? "1" : "0");
		}

		// Enable or disable a collection of kernel options by writing a "1" or a "0" into each /sys file.
		static bool setMultipleKernelOptionsEnable(const char** filenames, size_t count, bool enable)
		{
		bool result = true;
		for (size_t i = 0; i < count; i++) {
		result &= setKernelOptionEnable(filenames[i], enable);
		}
		return result;
		}

		// Enable or disable overwriting of the kernel trace buffers. Disabling this
		// will cause tracing to stop once the trace buffers have filled up.
		static bool setTraceOverwriteEnable(bool enable)
		@@ -140,6 +160,12 @@ static bool setWorkqueueTracingEnabled(bool enable)
		return setKernelOptionEnable(k_workqueueEnablePath, enable);
		}

		// Enable or disable tracing of disk I/O.
		static bool setDiskTracingEnabled(bool enable)
		{
		return setMultipleKernelOptionsEnable(k_diskEnablePaths, NELEM(k_diskEnablePaths), enable);
		}

		// Enable or disable kernel tracing.
		static bool setTracingEnabled(bool enable)
		{
		@@ -199,6 +225,7 @@ static bool startTrace()
		ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad);
		}
		ok &= setWorkqueueTracingEnabled(g_traceWorkqueue);
		ok &= setDiskTracingEnabled(g_traceDisk);
		ok &= setTraceBufferSizeKB(g_traceBufferSizeKB);
		ok &= setGlobalClockEnable(true);

		@@ -336,6 +363,7 @@ static void showHelp(const char *cmd)
		fprintf(stderr, "options include:\n"
		" -b N use a trace buffer size of N KB\n"
		" -c trace into a circular buffer\n"
		" -d trace disk I/O\n"
		" -f trace CPU frequency changes\n"
		" -l trace CPU frequency governor load\n"
		" -s trace the kernel scheduler switches\n"
		@@ -374,7 +402,7 @@ int main(int argc, char **argv)
		for (;;) {
		int ret;

		ret = getopt(argc, argv, "b:ciflst:wz");
		ret = getopt(argc, argv, "b:cidflst:wz");

		if (ret < 0) {
		break;
		@@ -397,6 +425,10 @@ int main(int argc, char **argv)
		g_traceGovernorLoad = true;
		break;

		case 'd':
		g_traceDisk = true;
		break;

		case 'f':
		g_traceCpuFrequency = true;
		break;