linux-kernel - [PATCH 11/14] resource limits: track highwater mark of number of pending signals

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Date:	Fri, 15 Jul 2016 13:35:58 +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>,
	Ingo Molnar <mingo@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Amanieu d'Antras" <amanieu@...il.com>,
	Stas Sergeev <stsp@...t.ru>, Andy Lutomirski <luto@...nel.org>,
	Wang Xiaoqiang <wangxq10@....edu.cn>,
	Sasha Levin <sasha.levin@...cle.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [PATCH 11/14] resource limits: track highwater mark of number of pending signals

Track maximum number of pending signals, to be able to configure
RLIMIT_SIGPENDING resource limits. The information is available
with taskstats and cgroupstats netlink socket.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 kernel/signal.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/signal.c b/kernel/signal.c
index 96e9bc4..670d609 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -387,6 +387,8 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
 		INIT_LIST_HEAD(&q->list);
 		q->flags = 0;
 		q->user = user;
+		task_update_resource_highwatermark(t, RLIMIT_SIGPENDING,
+						   atomic_read(&user->sigpending));
 	}
 
 	return q;
-- 
2.8.1