linux-kernel - [RFC 06/18] limits: present RLIMIT_CPU and RLIMIT

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Date:	Mon, 13 Jun 2016 22:44:13 +0300
From:	Topi Miettinen <toiwoton@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Topi Miettinen <toiwoton@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	John Stultz <john.stultz@...aro.org>,
	Janis Danisevskis <jdanis@...gle.com>,
	Calvin Owens <calvinowens@...com>, Jann Horn <jann@...jh.net>
Subject: [RFC 06/18] limits: present RLIMIT_CPU and RLIMIT_RTTIMER current status

Present current cputimer status in /proc/self/limits.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 fs/proc/base.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 227997b..1df4fc8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -650,8 +650,30 @@ static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
 			seq_printf(m, "%-10s", lnames[i].unit);
 		else
 			seq_printf(m, "%-10s", "");
-		seq_printf(m, "%-20lu\n",
-			   task->signal->rlim_curmax[i]);
+
+		switch (i) {
+		case RLIMIT_RTTIME:
+		case RLIMIT_CPU:
+			if (rlim[i].rlim_max == RLIM_INFINITY)
+				seq_printf(m, "%-20s\n", "-");
+			else {
+				unsigned long long utime, ptime;
+				unsigned long psecs;
+				struct task_cputime cputime;
+
+				thread_group_cputimer(task, &cputime);
+				utime = cputime_to_expires(cputime.utime);
+				ptime = utime + cputime_to_expires(cputime.stime);
+				psecs = cputime_to_secs(ptime);
+				if (i == RLIMIT_RTTIME)
+					psecs *= USEC_PER_SEC;
+				seq_printf(m, "%-20lu\n", psecs);
+			}
+			break;
+		default:
+			seq_printf(m, "%-20lu\n",
+				   task->signal->rlim_curmax[i]);
+		}
 	}
 
 	return 0;
-- 
2.8.1