cleanerd is a very important process in a system which uses nilfs. So it should
adjust the OOM killer for reducing possibility of the killing as much as
possible.
Signed-off-by: Hitoshi Mitake <mitake.hito...@lab.ntt.co.jp>
---
sbin/cleanerd/cleanerd.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/sbin/cleanerd/cleanerd.c b/sbin/cleanerd/cleanerd.c
index edfa083..3494a9a 100644
--- a/sbin/cleanerd/cleanerd.c
+++ b/sbin/cleanerd/cleanerd.c
@@ -654,6 +654,40 @@ nilfs_cleanerd_select_segments(struct nilfs_cleanerd
*cleanerd,
return nssegs;
}
+static int oom_adjust(void)
+{
+ int fd, err;
+ const char *path, *score;
+ struct stat st;
+
+ /* Avoid oom-killer */
+ path = "/proc/self/oom_score_adj";
+ score = "-1000\n";
+
+ if (stat(path, &st)) {
+ /* oom_score_adj cannot be used, try oom_adj */
+ path = "/proc/self/oom_adj";
+ score = "-17\n";
+ }
+
+ fd = open(path, O_WRONLY);
+ if (fd < 0) {
+ fprintf(stderr, "can't adjust oom-killer's pardon %s, %m\n",
+ path);
+ return errno;
+ }
+
+ err = write(fd, score, strlen(score));
+ if (err < 0) {
+ fprintf(stderr, "can't adjust oom-killer's pardon %s, %m\n",
+ path);
+ close(fd);
+ return errno;
+ }
+ close(fd);
+ return 0;
+}
+
#define DEVNULL "/dev/null"
#define ROOTDIR "/"
@@ -1549,6 +1583,11 @@ int main(int argc, char *argv[])
exit(1);
}
+ if (oom_adjust() < 0) {
+ fprintf(stderr, "adjusting the OOM killer falied: %m\n");
+ exit(1);
+ }
+
openlog(progname, LOG_PID, LOG_DAEMON);
syslog(LOG_INFO, "start");
--
1.8.1.2
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