linux-kernel - [PATCH] Raise default hard ulimit on number of files to 4096

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Date:	Thu, 31 Mar 2011 15:26:50 -0600
From:	Tim Gardner <tim.gardner@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Tim Gardner <tim.gardner@...onical.com>,
	Dan Kegel <dank@...el.com>
Subject: [PATCH] Raise default hard ulimit on number of files to 4096

Apps are increasingly using more than 1024 file descriptors.
See discussion in several distro bug trackers, e.g.
https://bugs.launchpad.net/bugs/663090
https://issues.rpath.com/browse/RPL-2054

Cc: Dan Kegel <dank@...el.com>
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
---
 include/asm-generic/resource.h |    2 +-
 include/linux/fs.h             |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/resource.h b/include/asm-generic/resource.h
index 587566f..61fa862 100644
--- a/include/asm-generic/resource.h
+++ b/include/asm-generic/resource.h
@@ -78,7 +78,7 @@
 	[RLIMIT_CORE]		= {              0,  RLIM_INFINITY },	\
 	[RLIMIT_RSS]		= {  RLIM_INFINITY,  RLIM_INFINITY },	\
 	[RLIMIT_NPROC]		= {              0,              0 },	\
-	[RLIMIT_NOFILE]		= {       INR_OPEN,       INR_OPEN },	\
+	[RLIMIT_NOFILE]		= {   INR_OPEN_CUR,   INR_OPEN_MAX },	\
 	[RLIMIT_MEMLOCK]	= {    MLOCK_LIMIT,    MLOCK_LIMIT },	\
 	[RLIMIT_AS]		= {  RLIM_INFINITY,  RLIM_INFINITY },	\
 	[RLIMIT_LOCKS]		= {  RLIM_INFINITY,  RLIM_INFINITY },	\
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 52f283c..6e1e4e6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -23,7 +23,8 @@
 
 /* Fixed constants first: */
 #undef NR_OPEN
-#define INR_OPEN 1024		/* Initial setting for nfile rlimits */
+#define INR_OPEN_CUR 1024	/* Initial setting for nfile rlimits */
+#define INR_OPEN_MAX 4096	/* Hard limit for nfile rlimits */
 
 #define BLOCK_SIZE_BITS 10
 #define BLOCK_SIZE (1<<BLOCK_SIZE_BITS)
-- 
1.7.0.4

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