DO NOT MERGE limit mediaserver memory
Limit mediaserver using rlimit, to prevent it from bringing down the system
via the low memory killer.
Default max is 65% of total RAM, but can be customized via system property.
Bug: 28471206
Bug: 28615448
Change-Id: I14fac1e12b5f3983be08a21bfbfc54feedbf3f16
diff --git a/media/libmedia/MediaUtils.cpp b/media/libmedia/MediaUtils.cpp
new file mode 100644
index 0000000..83b8af3
--- /dev/null
+++ b/media/libmedia/MediaUtils.cpp
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+// for property functions below
+#define __STDINT_LIMITS
+#include <stdint.h>
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+
+
+#define LOG_TAG "MediaUtils"
+#define LOG_NDEBUG 0
+#include <utils/Log.h>
+
+#include <cutils/properties.h>
+#include <sys/resource.h>
+#include <unistd.h>
+
+#include "MediaUtils.h"
+
+namespace android {
+
+// following property functions borrowed from lmp properties.c
+static intmax_t property_get_imax(const char *key, intmax_t lower_bound, intmax_t upper_bound,
+ intmax_t default_value) {
+ if (!key) {
+ return default_value;
+ }
+
+ intmax_t result = default_value;
+ char buf[PROPERTY_VALUE_MAX] = {'\0',};
+ char *end = NULL;
+
+ int len = property_get(key, buf, "");
+ if (len > 0) {
+ int tmp = errno;
+ errno = 0;
+
+ // Infer base automatically
+ result = strtoimax(buf, &end, /*base*/0);
+ if ((result == INTMAX_MIN || result == INTMAX_MAX) && errno == ERANGE) {
+ // Over or underflow
+ result = default_value;
+ ALOGV("%s(%s,%" PRIdMAX ") - overflow", __FUNCTION__, key, default_value);
+ } else if (result < lower_bound || result > upper_bound) {
+ // Out of range of requested bounds
+ result = default_value;
+ ALOGV("%s(%s,%" PRIdMAX ") - out of range", __FUNCTION__, key, default_value);
+ } else if (end == buf) {
+ // Numeric conversion failed
+ result = default_value;
+ ALOGV("%s(%s,%" PRIdMAX ") - numeric conversion failed",
+ __FUNCTION__, key, default_value);
+ }
+
+ errno = tmp;
+ }
+
+ return result;
+}
+
+static int64_t property_get_int64(const char *key, int64_t default_value) {
+ return (int64_t)property_get_imax(key, INT64_MIN, INT64_MAX, default_value);
+}
+
+void limitProcessMemory(
+ const char *property,
+ size_t numberOfBytes,
+ size_t percentageOfTotalMem) {
+
+ long pageSize = sysconf(_SC_PAGESIZE);
+ long numPages = sysconf(_SC_PHYS_PAGES);
+ size_t maxMem = SIZE_MAX;
+
+ if (pageSize > 0 && numPages > 0) {
+ if (size_t(numPages) < SIZE_MAX / size_t(pageSize)) {
+ maxMem = size_t(numPages) * size_t(pageSize);
+ }
+ ALOGV("physMem: %zu", maxMem);
+ if (percentageOfTotalMem > 100) {
+ ALOGW("requested %zu%% of total memory, using 100%%", percentageOfTotalMem);
+ percentageOfTotalMem = 100;
+ }
+ maxMem = maxMem / 100 * percentageOfTotalMem;
+ if (numberOfBytes < maxMem) {
+ maxMem = numberOfBytes;
+ }
+ ALOGV("requested limit: %zu", maxMem);
+ } else {
+ ALOGW("couldn't determine total RAM");
+ }
+
+ int64_t propVal = property_get_int64(property, maxMem);
+ if (propVal > 0 && uint64_t(propVal) <= SIZE_MAX) {
+ maxMem = propVal;
+ }
+ ALOGV("actual limit: %zu", maxMem);
+
+ struct rlimit limit;
+ getrlimit(RLIMIT_AS, &limit);
+ ALOGV("original limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
+ limit.rlim_cur = maxMem;
+ setrlimit(RLIMIT_AS, &limit);
+ limit.rlim_cur = -1;
+ limit.rlim_max = -1;
+ getrlimit(RLIMIT_AS, &limit);
+ ALOGV("new limits: %lld/%lld", (long long)limit.rlim_cur, (long long)limit.rlim_max);
+
+}
+
+
+} // namespace android