linux-kernel - [PATCH 08/14] resource limits: track highwater mark of number of files

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Date:	Fri, 15 Jul 2016 13:35:55 +0300
From:	Topi Miettinen <toiwoton@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Topi Miettinen <toiwoton@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS (VFS and
	infrastructure))
Subject: [PATCH 08/14] resource limits: track highwater mark of number of files

Track maximum number of files for the process, to be able to configure
RLIMIT_NOFILE resource limits. The information is available
with taskstats and cgroupstats netlink socket.

Signed-off-by: Topi Miettinen <toiwoton@...il.com>
---
 fs/file.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/file.c b/fs/file.c
index 6b1acdf..9de37c9 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -547,6 +547,8 @@ repeat:
 	}
 #endif
 
+	update_resource_highwatermark(RLIMIT_NOFILE, fd);
+
 out:
 	spin_unlock(&files->file_lock);
 	return error;
@@ -857,6 +859,8 @@ __releases(&files->file_lock)
 	if (tofree)
 		filp_close(tofree, files);
 
+	update_resource_highwatermark(RLIMIT_NOFILE, fd);
+
 	return fd;
 
 Ebusy:
-- 
2.8.1