1 files changed, 183 insertions, 0 deletions
diff --git a/systemservice/resource_manager/drop_caches/src/drop_caches.cpp b/systemservice/resource_manager/drop_caches/src/drop_caches.cpp
new file mode 100644
index 00000000..d1927052
--- /dev/null
+++ b/systemservice/resource_manager/drop_caches/src/drop_caches.cpp
@@ -0,0 +1,183 @@
+/*
+ * @copyright Copyright (c) 2016-2020 TOYOTA MOTOR CORPORATION.
+ *
+ * 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 <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <time.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "ss_resm_resourcemanagerlog.h"
+
+#define DROP_CACHES "/proc/sys/vm/drop_caches"
+
+// FRAMEWORKUNIFIEDLOG
+FRAMEWORKUNIFIEDLOGPARAM g_FrameworkunifiedLogParams = {
+  FRAMEWORKUNIFIEDLOGOPTIONS,
+  {
+    ZONE_TEXT_10, ZONE_TEXT_11, ZONE_TEXT_12,
+    ZONE_TEXT_13, ZONE_TEXT_14, ZONE_TEXT_15,
+    ZONE_TEXT_16, ZONE_TEXT_17, ZONE_TEXT_18,
+    ZONE_TEXT_19, ZONE_TEXT_20, ZONE_TEXT_21,
+    ZONE_TEXT_22, ZONE_TEXT_23, ZONE_TEXT_24,
+    ZONE_TEXT_25, ZONE_TEXT_26, ZONE_TEXT_27,
+    ZONE_TEXT_28, ZONE_TEXT_29, ZONE_TEXT_30,
+    ZONE_TEXT_31
+  },
+  FRAMEWORKUNIFIEDLOGZONES
+};
+
+// echo 1 > /proc/sys/vm/drop_caches
+#define DROP_CACHES_INTVAL_TIMESEC (1 * 10)  // 10 sec
+
+#define MEMINFO_FILE "/proc/meminfo"
+
+/* memFree threshold */
+#define MEMFREE_THRETHOLD (100*1024)
+/* LowFree - CmaFree threshold */
+#define LOWFREE_THRETHOLD (50*1024)
+
+static uint32_t mainFree_kib;
+static uint32_t lowFree_kib;
+static uint32_t cmaFree_kib;
+// meminfo table
+typedef struct {
+  const char* name;
+  uint32_t* value;
+} meminfo_tbl;
+
+static int32_t get_meminfo(void);
+static int32_t comp_meminfo_tbl(const void* data1, const void* data2);
+static bool judge_cachedrop(void);
+
+static void
+exec_drop_caches(void) {
+  int fd;
+
+  fd = open(DROP_CACHES, O_RDWR);
+  if (fd >= 0) {
+    write(fd, (const void *)"1", 1);
+    close(fd);
+  } else {
+    FRAMEWORKUNIFIEDLOG(ZONE_ERR, __FUNCTION__, "%s open error (fd:%d, errno:%d)", DROP_CACHES, fd, errno);
+  }
+}
+
+int
+main(int argc, char* argv[]) {
+  const struct timespec drop_caches_intval = {DROP_CACHES_INTVAL_TIMESEC, 0};
+
+  FRAMEWORKUNIFIED_SET_ZONES();
+
+  while (1) {
+    /* Get meminfo */
+    get_meminfo();
+    if (judge_cachedrop()) {
+      exec_drop_caches();
+    }
+    nanosleep(&drop_caches_intval, NULL);
+  }
+
+  return 0;
+}
+
+/* Compare memory information */
+static int32_t
+comp_meminfo_tbl(const void* data1, const void* data2) {
+  return strcmp(((const meminfo_tbl*)data1)->name,
+                ((const meminfo_tbl*)data2)->name);
+}
+
+/* Get memory information */
+static int32_t
+get_meminfo(void) {
+  int32_t meminfo_fd = -1;
+  char srch_name[16];
+  char buf[2048];
+  meminfo_tbl target = {srch_name, NULL};
+  meminfo_tbl* found;
+  char* head;
+  char* tail;
+  int32_t read_byte;
+  /* Strings must be in ascending order when adding entries to this table (for bsearch) */
+  static const meminfo_tbl mem_table[] = {
+    {"CmaFree",  &cmaFree_kib},
+    {"LowFree",  &lowFree_kib},
+    {"MemFree",  &mainFree_kib},
+  };
+  const int32_t mem_table_count = sizeof(mem_table)/sizeof(meminfo_tbl);
+
+  if (meminfo_fd == -1) {
+    meminfo_fd = open(MEMINFO_FILE, O_RDONLY);
+    if (meminfo_fd == -1) {
+      fflush(NULL);
+      return -1;
+    }
+  }
+
+  lseek(meminfo_fd, 0L, SEEK_SET);
+  read_byte = read (meminfo_fd, buf, sizeof(buf) - 1);
+  if (read_byte < 0) {
+    fflush(NULL);
+    close(meminfo_fd);
+    return -1;
+  }
+  buf[read_byte] = '\0';
+
+  head = buf;
+  while (1) {
+    tail = strchr(head, ':');
+    if (!tail) {
+      break;
+    }
+    *tail = '\0';
+    if (strlen (head) >= sizeof(srch_name)) {
+      head = tail + 1;
+    } else {
+      strcpy(srch_name, head);  // NOLINT
+      found = reinterpret_cast<meminfo_tbl *>(bsearch(&target, mem_table, mem_table_count,
+                                      sizeof(meminfo_tbl), comp_meminfo_tbl));
+      head = tail + 1;
+      if (found) {
+        *(found->value) = strtoul(head, &tail, 10);
+      }
+    }
+    tail = strchr(head, '\n');
+    if (!tail)
+      break;
+    head = tail + 1;
+  }
+  close(meminfo_fd);
+
+  return 0;
+}
+
+static bool
+judge_cachedrop(void) {
+  if (mainFree_kib < MEMFREE_THRETHOLD) {
+    return true;
+  }
+
+  if ((lowFree_kib - cmaFree_kib) < LOWFREE_THRETHOLD) {
+    return true;
+  }
+
+  return false;
+}