diff options
Diffstat (limited to 'libs/utils/Trace.cpp')
| -rw-r--r-- | libs/utils/Trace.cpp | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/libs/utils/Trace.cpp b/libs/utils/Trace.cpp index f3ec485..5cd5731 100644 --- a/libs/utils/Trace.cpp +++ b/libs/utils/Trace.cpp @@ -19,6 +19,7 @@ #include <cutils/properties.h> #include <utils/Log.h> #include <utils/Trace.h> +#include <utils/misc.h> namespace android { @@ -27,10 +28,19 @@ int Tracer::sTraceFD = -1; uint64_t Tracer::sEnabledTags = 0; Mutex Tracer::sMutex; +void Tracer::changeCallback() { + Mutex::Autolock lock(sMutex); + if (sIsReady && sTraceFD >= 0) { + loadSystemProperty(); + } +} + void Tracer::init() { Mutex::Autolock lock(sMutex); if (!sIsReady) { + add_sysprop_change_callback(changeCallback, 0); + const char* const traceFileName = "/sys/kernel/debug/tracing/trace_marker"; sTraceFD = open(traceFileName, O_WRONLY); @@ -38,14 +48,18 @@ void Tracer::init() { ALOGE("error opening trace file: %s (%d)", strerror(errno), errno); // sEnabledTags remains zero indicating that no tracing can occur } else { - char value[PROPERTY_VALUE_MAX]; - property_get("debug.atrace.tags.enableflags", value, "0"); - sEnabledTags = (strtoll(value, NULL, 0) & ATRACE_TAG_VALID_MASK) - | ATRACE_TAG_ALWAYS; + loadSystemProperty(); } android_atomic_release_store(1, &sIsReady); } } +void Tracer::loadSystemProperty() { + char value[PROPERTY_VALUE_MAX]; + property_get("debug.atrace.tags.enableflags", value, "0"); + sEnabledTags = (strtoll(value, NULL, 0) & ATRACE_TAG_VALID_MASK) + | ATRACE_TAG_ALWAYS; +} + } // namespace andoid |