ADHOC/replicant-frameworks_native
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Add disk I/O tracing.

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Bug: 6488845
Change-Id: I93acb726f35b114fb1ea7297da4456826f805b7b
This commit is contained in:
Jeff Brown 2012-05-22 18:58:46 -07:00
parent 3169533f1d
commit ac9453d82e
2 changed files with 34 additions and 1 deletions
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1
cmds/atrace/Android.mk
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@ -6,6 +6,7 @@ include $(CLEAR_VARS)
LOCAL_SRC_FILES:= atrace.c
LOCAL_C_INCLUDES += external/zlib
LOCAL_CFLAGS += -std=c99
LOCAL_MODULE:= atrace

34
cmds/atrace/atrace.c
View File

@ -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;