Adding system property tracing
Introducing a new systrace tag, TRACE_TAG_SYSPROP, for use with
system property.
For property set, the tracing is added in __system_property_set() instead of
__system_property_update() / __system_property_add() so we can record
control properties like ctl.*, sys.powerctl.*, etc.., which won't be
updated via the latter two functions.
Bug: 147275573
Test: atest CtsBionicTestCases
Test: adb shell perfetto -o /data/misc/perfetto-traces/test_trace -t 10s bionic
Test: adb shell perfetto -o /data/misc/perfetto-traces/test_trace -t 10s sysprop
Test: adb shell /data/benchmarktest64/bionic-benchmarks/bionic-benchmarks \
--benchmark_filter=BM_property --bionic_cpu=4, then compares the results
of property benchmarks before and after the change, didn't see
significant difference.
Change-Id: Id2b93acb2ce02b308c0e4889f836159151af3b46
diff --git a/libc/private/bionic_systrace.h b/libc/private/bionic_systrace.h
index dbe1739..6b11812 100644
--- a/libc/private/bionic_systrace.h
+++ b/libc/private/bionic_systrace.h
@@ -16,8 +16,12 @@
#pragma once
+#include <cutils/trace.h> // For ATRACE_TAG_BIONIC.
+
#include "platform/bionic/macros.h"
+static constexpr char kTraceTagsProp[] = "debug.atrace.tags.enableflags";
+
// Tracing class for bionic. To begin a trace at a specified point:
// ScopedTrace("Trace message");
// The trace will end when the contructor goes out of scope.
@@ -33,5 +37,9 @@
BIONIC_DISALLOW_COPY_AND_ASSIGN(ScopedTrace);
};
+int get_trace_marker_fd();
+bool should_trace(const uint64_t enable_tags = ATRACE_TAG_BIONIC);
+void output_trace(const char* message, const char event = 'B');
+
void bionic_trace_begin(const char* message);
void bionic_trace_end();