linux-kernel - [PATCH 12/14] resource limits: track highwater mark of size of message queues

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Message-Id: <1468578983-28229-13-git-send-email-toiwoton@gmail.com>
Date:	Fri, 15 Jul 2016 13:35:59 +0300
From:	Topi Miettinen <toiwoton@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Topi Miettinen <toiwoton@...il.com>,
	Michal Hocko <mhocko@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marcus Gelderie <redmnic@...il.com>,
	Doug Ledford <dledford@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Vladimir Davydov <vdavydov@...tuozzo.com>
Subject: [PATCH 12/14] resource limits: track highwater mark of size of message queues

Track maximum size of message queues, to be able to configure
RLIMIT_MSGQUEUE resource limits. The information is available
with taskstats and cgroupstats netlink socket.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 ipc/mqueue.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index ade739f..037ea47 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -287,6 +287,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
 
 		/* all is ok */
 		info->user = get_uid(u);
+		update_resource_highwatermark(RLIMIT_MSGQUEUE, u->mq_bytes);
 	} else if (S_ISDIR(mode)) {
 		inc_nlink(inode);
 		/* Some things misbehave if size == 0 on a directory */
-- 
2.8.1