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author | Jamie Gennis <jgennis@google.com> | 2012-04-10 15:18:39 -0700 |
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committer | Android (Google) Code Review <android-gerrit@google.com> | 2012-04-10 15:18:39 -0700 |
commit | 7c139e7dedf31224df51d6454e59bd2aa64739d9 (patch) | |
tree | deb00a84fb6300956583e61c41e679405d093316 | |
parent | 78c43b51a4d052fda6648024c60eaf5bc67dfc5d (diff) | |
parent | 416fd36c9f7097a11ea610522ef8297d2b82d27b (diff) | |
download | extras-7c139e7dedf31224df51d6454e59bd2aa64739d9.tar.gz |
Merge "atrace: make cpu freq governor tracing optional"
-rw-r--r-- | atrace/atrace.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/atrace/atrace.c b/atrace/atrace.c index a617432f..92fe5d10 100644 --- a/atrace/atrace.c +++ b/atrace/atrace.c @@ -55,7 +55,6 @@ static const char* k_cpuFreqEnablePath = static const char* k_governorLoadEnablePath = "/sys/kernel/debug/tracing/events/cpufreq_interactive/enable"; - static const char* k_workqueueEnablePath = "/sys/kernel/debug/tracing/events/workqueue/enable"; @@ -169,6 +168,11 @@ static bool setGlobalClockEnable(bool enable) return writeStr(k_traceClockPath, enable ? "global" : "local"); } +// Check whether a file exists. +static bool fileExists(const char* filename) { + return access(filename, F_OK) != -1; +} + // Enable tracing in the kernel. static bool startTrace() { @@ -178,7 +182,9 @@ static bool startTrace() ok &= setTraceOverwriteEnable(g_traceOverwrite); ok &= setSchedSwitchTracingEnable(g_traceSchedSwitch); ok &= setCpuFrequencyTracingEnable(g_traceCpuFrequency); - ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad); + if (fileExists(k_governorLoadEnablePath) || g_traceGovernorLoad) { + ok &= setGovernorLoadTracingEnable(g_traceGovernorLoad); + } ok &= setWorkqueueTracingEnabled(g_traceWorkqueue); ok &= setTraceBufferSizeKB(g_traceBufferSizeKB); ok &= setGlobalClockEnable(true); @@ -203,7 +209,9 @@ static void stopTrace() setTraceOverwriteEnable(true); setSchedSwitchTracingEnable(false); setCpuFrequencyTracingEnable(false); - setGovernorLoadTracingEnable(false); + if (fileExists(k_governorLoadEnablePath)) { + setGovernorLoadTracingEnable(false); + } setWorkqueueTracingEnabled(false); setGlobalClockEnable(false); |