[igt-dev] [PATCH i-g-t] runner: Make sure oom-killer doesn't kill the runner

[Petri Latvala <petri.latvala@intel.com>]

Tests that eat all of the RAM and then some to invoke the oom-killer
deliberately sometimes cause extra casualties. Make sure the runner
stays alive.

Signed-off-by: Petri Latvala <petri.latvala@intel.com>
---
 runner/executor.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/runner/executor.c b/runner/executor.c
index 0e91b7ab..7e5fbe8f 100644
--- a/runner/executor.c
+++ b/runner/executor.c
@@ -1221,6 +1221,22 @@ static void write_abort_file(int resdirfd,
 	}
 }
 
+static void oom_immortal(void)
+{
+	int fd;
+	const char never_kill[] = "-1000";
+
+	fd = open("/proc/self/oom_score_adj", O_WRONLY);
+	if (fd < 0) {
+		fprintf(stderr, "Warning: Cannot adjust oom score.\n");
+		return;
+	}
+	if (write(fd, never_kill, sizeof(never_kill)) != sizeof(never_kill))
+		fprintf(stderr, "Warning: Adjusting oom score failed.\n");
+
+	close(fd);
+}
+
 bool execute(struct execute_state *state,
 	     struct settings *settings,
 	     struct job_list *job_list)
@@ -1268,6 +1284,8 @@ bool execute(struct execute_state *state,
 		close(timefd);
 	}
 
+	oom_immortal();
+
 	init_watchdogs(settings);
 
 	if (!uname(&unamebuf)) {
-- 
2.19.1

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