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am f6aa1779: Merge "Revert "Added a bionic systrace class and tracing to pthread_mutex.cpp."" into lmp-dev

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* commit 'f6aa17798c5b0015d002b982c3684595b817d2d0':
  Revert "Added a bionic systrace class and tracing to pthread_mutex.cpp."
This commit is contained in:
Elliott Hughes 2014-07-30 16:41:43 +00:00 committed by Android Git Automerger
commit 4d17c6c39f
4 changed files with 0 additions and 155 deletions
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1
libc/Android.mk
View file

@ -90,7 +90,6 @@ libc_bionic_src_files := \
bionic/access.cpp \
bionic/assert.cpp \
bionic/atof.cpp \
bionic/bionic_systrace.cpp \
bionic/bionic_time_conversions.cpp \
bionic/brk.cpp \
bionic/c16rtomb.cpp \

107
libc/bionic/bionic_systrace.cpp
View file

@ -1,107 +0,0 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cutils/trace.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include "private/bionic_systrace.h"
#include "private/libc_logging.h"
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#define WRITE_OFFSET 32
static const prop_info* g_pinfo = NULL;
static uint32_t g_serial = -1;
static uint64_t g_tags = 0;
static int g_trace_marker_fd = -1;
static bool should_trace() {
// If g_pinfo is null, this means that systrace hasn't been run and it's safe to
// assume that no trace writing will need to take place. However, to avoid running
// this costly find check each time, we set it to a non-tracing value so that next
// time, it will just check the serial to see if the value has been changed.
// this function also deals with the bootup case, during which the call to property
// set will fail if the property server hasn't yet started.
if (g_pinfo == NULL) {
g_pinfo = __system_property_find("debug.atrace.tags.enableflags");
if (g_pinfo == NULL) {
__system_property_set("debug.atrace.tags.enableflags", "0");
g_pinfo = __system_property_find("debug.atrace.tags.enableflags");
if (g_pinfo == NULL) {
return false;
}
}
}
// Find out which tags have been enabled on the command line and set
// the value of tags accordingly. If the value of the property changes,
// the serial will also change, so the costly system_property_read function
// can be avoided by calling the much cheaper system_property_serial
// first. The values within pinfo may change, but its location is guaranteed
// not to move.
const uint32_t cur_serial = __system_property_serial(g_pinfo);
if (cur_serial != g_serial) {
g_serial = cur_serial;
char value[PROP_VALUE_MAX];
__system_property_read(g_pinfo, 0, value);
g_tags = strtoull(value, NULL, 0);
}
// Finally, verify that this tag value enables bionic tracing.
return ((g_tags & ATRACE_TAG_BIONIC) != 0);
}
ScopedTrace::ScopedTrace(const char* message) {
if (!should_trace()) {
return;
}
if (g_trace_marker_fd == -1) {
g_trace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
if (g_trace_marker_fd == -1) {
__libc_fatal("Could not open kernel trace file: %s\n", strerror(errno));
}
}
// If bionic tracing has been enabled, then write the message to the
// kernel trace_marker.
int length = strlen(message);
char buf[length + WRITE_OFFSET];
size_t len = snprintf(buf, length + WRITE_OFFSET, "B|%d|%s", getpid(), message);
ssize_t wbytes = TEMP_FAILURE_RETRY(write(g_trace_marker_fd, buf, len));
// Error while writing
if (static_cast<size_t>(wbytes) != len) {
__libc_fatal("Could not write to kernel trace file: %s\n", strerror(errno));
}
}
ScopedTrace::~ScopedTrace() {
if (!should_trace()) {
return;
}
ssize_t wbytes = TEMP_FAILURE_RETRY(write(g_trace_marker_fd, "E", 1));
// Error while writing
if (static_cast<size_t>(wbytes) != 1) {
__libc_fatal("Could not write to kernel trace file: %s\n", strerror(errno));
}
}

12
libc/bionic/pthread_mutex.cpp
View file

@ -39,8 +39,6 @@
#include "private/bionic_futex.h"
#include "private/bionic_tls.h"
#include "private/bionic_systrace.h"
extern void pthread_debug_mutex_lock_check(pthread_mutex_t *mutex);
extern void pthread_debug_mutex_unlock_check(pthread_mutex_t *mutex);
@ -335,10 +333,6 @@ static inline void _normal_lock(pthread_mutex_t* mutex, int shared) {
* that the mutex is in state 2 when we go to sleep on it, which
* guarantees a wake-up call.
*/
ScopedTrace trace("Contending for pthread mutex");
while (__bionic_swap(locked_contended, &mutex->value) != unlocked) {
__futex_wait_ex(&mutex->value, shared, locked_contended, NULL);
}
@ -479,8 +473,6 @@ int pthread_mutex_lock(pthread_mutex_t* mutex) {
mvalue = mutex->value;
}
ScopedTrace trace("Contending for pthread mutex");
for (;;) {
int newval;
@ -634,8 +626,6 @@ static int __pthread_mutex_timedlock(pthread_mutex_t* mutex, const timespec* abs
return 0;
}
ScopedTrace trace("Contending for timed pthread mutex");
// Loop while needed.
while (__bionic_swap(locked_contended, &mutex->value) != unlocked) {
if (__timespec_from_absolute(&ts, abs_timeout, clock) < 0) {
@ -668,8 +658,6 @@ static int __pthread_mutex_timedlock(pthread_mutex_t* mutex, const timespec* abs
mvalue = mutex->value;
}
ScopedTrace trace("Contending for timed pthread mutex");
while (true) {
// If the value is 'unlocked', try to acquire it directly.
// NOTE: put state to 2 since we know there is contention.

35
libc/private/bionic_systrace.h
View file

@ -1,35 +0,0 @@
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef BIONIC_SYSTRACE_H
#define BIONIC_SYSTRACE_H
#include "bionic_macros.h"
// 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.
class ScopedTrace {
public:
explicit ScopedTrace(const char* message);
~ScopedTrace();
private:
DISALLOW_COPY_AND_ASSIGN(ScopedTrace);
};
#endif