camera: Collect stack traces when bad things happen, print with dumpsys
Bug: 11324229
Change-Id: Ic920e170a8f5a389fc139bbf5416c0e3186c7fb6
diff --git a/services/camera/libcameraservice/utils/CameraTraces.cpp b/services/camera/libcameraservice/utils/CameraTraces.cpp
new file mode 100644
index 0000000..346e15f
--- /dev/null
+++ b/services/camera/libcameraservice/utils/CameraTraces.cpp
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#define LOG_TAG "CameraTraces"
+#define ATRACE_TAG ATRACE_TAG_CAMERA
+//#define LOG_NDEBUG 0
+
+#include "utils/CameraTraces.h"
+#include <utils/ProcessCallStack.h>
+
+#include <utils/Mutex.h>
+#include <utils/List.h>
+
+#include <utils/Log.h>
+#include <cutils/trace.h>
+
+namespace android {
+namespace camera3 {
+
+struct CameraTracesImpl {
+ Mutex tracesLock;
+ List<ProcessCallStack> pcsList;
+}; // class CameraTraces::Impl;
+
+static CameraTracesImpl gImpl;
+CameraTracesImpl& CameraTraces::sImpl = gImpl;
+
+void CameraTraces::saveTrace() {
+ ALOGV("%s: begin", __FUNCTION__);
+ ATRACE_BEGIN("CameraTraces::saveTrace");
+ Mutex::Autolock al(sImpl.tracesLock);
+
+ List<ProcessCallStack>& pcsList = sImpl.pcsList;
+
+ // Insert new ProcessCallStack, and immediately crawl all the threads
+ pcsList.push_front(ProcessCallStack());
+ ProcessCallStack& pcs = *pcsList.begin();
+ pcs.update();
+
+ if (pcsList.size() > MAX_TRACES) {
+ // Prune list periodically and discard oldest entry
+ pcsList.erase(--pcsList.end());
+ }
+
+ IF_ALOGV() {
+ pcs.log(LOG_TAG, ANDROID_LOG_VERBOSE);
+ }
+
+ ALOGD("Process trace saved. Use dumpsys media.camera to view.");
+
+ ATRACE_END();
+}
+
+status_t CameraTraces::dump(int fd, const Vector<String16> &args __attribute__((unused))) {
+ ALOGV("%s: fd = %d", __FUNCTION__, fd);
+ Mutex::Autolock al(sImpl.tracesLock);
+ List<ProcessCallStack>& pcsList = sImpl.pcsList;
+
+ if (fd < 0) {
+ ALOGW("%s: Negative FD (%d)", __FUNCTION__, fd);
+ return BAD_VALUE;
+ }
+
+ fdprintf(fd, "Camera traces (%zu):\n", pcsList.size());
+
+ if (pcsList.empty()) {
+ fdprintf(fd, " No camera traces collected.\n");
+ }
+
+ // Print newest items first
+ List<ProcessCallStack>::iterator it, end;
+ for (it = pcsList.begin(), end = pcsList.end(); it != end; ++it) {
+ const ProcessCallStack& pcs = *it;
+ pcs.dump(fd, DUMP_INDENT);
+ }
+
+ return OK;
+}
+
+}; // namespace camera3
+}; // namespace android
diff --git a/services/camera/libcameraservice/utils/CameraTraces.h b/services/camera/libcameraservice/utils/CameraTraces.h
new file mode 100644
index 0000000..d10dbc9
--- /dev/null
+++ b/services/camera/libcameraservice/utils/CameraTraces.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2013 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 ANDROID_SERVERS_CAMERA_TRACES_H_
+#define ANDROID_SERVERS_CAMERA_TRACES_H_
+
+#include <utils/Errors.h>
+#include <utils/String16.h>
+#include <utils/Vector.h>
+
+namespace android {
+namespace camera3 {
+
+class CameraTracesImpl;
+
+// Collect a list of the process's stack traces
+class CameraTraces {
+public:
+ /**
+ * Save the current stack trace for each thread in the process. At most
+ * MAX_TRACES will be saved, after which the oldest traces will be discarded.
+ *
+ * <p>Use CameraTraces::dump to print out the traces.</p>
+ */
+ static void saveTrace();
+
+ /**
+ * Prints all saved traces to the specified file descriptor.
+ *
+ * <p>Each line is indented by DUMP_INDENT spaces.</p>
+ */
+ static status_t dump(int fd, const Vector<String16>& args);
+
+private:
+ enum {
+ // Don't collect more than 100 traces. Discard oldest.
+ MAX_TRACES = 100,
+
+ // Insert 2 spaces when dumping the traces
+ DUMP_INDENT = 2,
+ };
+
+ CameraTraces();
+ ~CameraTraces();
+ CameraTraces(CameraTraces& rhs);
+
+ static CameraTracesImpl& sImpl;
+}; // class CameraTraces
+
+}; // namespace camera3
+}; // namespace android
+
+#endif // ANDROID_SERVERS_CAMERA_TRACES_H_