linux-kernel - [PATCH 13/14] resource limits: track highwater mark of niceness

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Date:	Fri, 15 Jul 2016 13:36:00 +0300
From:	Topi Miettinen <toiwoton@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Topi Miettinen <toiwoton@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 13/14] resource limits: track highwater mark of niceness

Track maximum nice priority, to be able to configure
RLIMIT_NICE resource limits. The information is available
with taskstats and cgroupstats netlink socket.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 97ee9ac..da32bcd 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3693,6 +3693,9 @@ void set_user_nice(struct task_struct *p, long nice)
 		if (delta < 0 || (delta > 0 && task_running(rq, p)))
 			resched_curr(rq);
 	}
+	task_update_resource_highwatermark(p, RLIMIT_NICE,
+					   nice_to_rlimit(nice));
+
 out_unlock:
 	task_rq_unlock(rq, p, &rf);
 }
-- 
2.8.1