b06766cbbf
This is to deprecate the sysprop change notification in atrace. After this change, processes will only update their enabled tags at the first atrace event. Previously we reloaded the tags as a result of the sysprop changed Binder notification, which woke up every process in the system. Test: adb shell su root atrace -t 10 ss Test: #define ATRACE_SHMEM 0; adb shell su root atrace -t 10 ss Bug: 137366208 Change-Id: Idffba5fd4ba23fba2f6b9f594365df68ac0c1626
103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <cutils/trace.h>
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#include "trace-dev.inc"
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static pthread_once_t atrace_once_control = PTHREAD_ONCE_INIT;
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// Set whether tracing is enabled in this process. This is used to prevent
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// the Zygote process from tracing.
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void atrace_set_tracing_enabled(bool enabled)
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{
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atomic_store_explicit(&atrace_is_enabled, enabled, memory_order_release);
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atrace_update_tags();
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}
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static void atrace_init_once()
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{
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atrace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
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if (atrace_marker_fd == -1) {
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ALOGE("Error opening trace file: %s (%d)", strerror(errno), errno);
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atrace_enabled_tags = 0;
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} else {
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atrace_enabled_tags = atrace_get_property();
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}
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#if !ATRACE_SHMEM
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atomic_store_explicit(&atrace_is_ready, true, memory_order_release);
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#endif
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}
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static void atrace_seq_number_changed(uint32_t prev_seq_no, uint32_t seq_no) {
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if (!atomic_load_explicit(&atrace_is_enabled, memory_order_acquire)) {
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return;
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}
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// Someone raced us.
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if (!atomic_compare_exchange_strong(&last_sequence_number, &prev_seq_no, seq_no)) {
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return;
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}
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if (CC_UNLIKELY(prev_seq_no == kSeqNoNotInit)) {
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#if defined(__BIONIC__)
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const prop_info* new_pi = __system_property_find("debug.atrace.tags.enableflags");
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if (new_pi) atrace_property_info = new_pi;
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#endif
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pthread_once(&atrace_once_control, atrace_init_once);
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}
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atrace_update_tags();
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}
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void atrace_setup()
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{
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#if ATRACE_SHMEM
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atrace_init();
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#else
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pthread_once(&atrace_once_control, atrace_init_once);
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#endif
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}
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void atrace_begin_body(const char* name)
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{
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WRITE_MSG("B|%d|", "%s", name, "");
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}
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void atrace_end_body()
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{
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WRITE_MSG("E|%d", "%s", "", "");
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}
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void atrace_async_begin_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("S|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_async_end_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("F|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_int_body(const char* name, int32_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId32, name, value);
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}
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void atrace_int64_body(const char* name, int64_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId64, name, value);
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}
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