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get rid of NR_OPEN and introduce a sysctl_nr_open

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NR_OPEN (historically set to 1024*1024) actually forbids processes to open
more than 1024*1024 handles.

Unfortunatly some production servers hit the not so 'ridiculously high
value' of 1024*1024 file descriptors per process.

Changing NR_OPEN is not considered safe because of vmalloc space potential
exhaust.

This patch introduces a new sysctl (/proc/sys/fs/nr_open) wich defaults to
1024*1024, so that admins can decide to change this limit if their workload
needs it.

[[email protected]: export it for sparc64]
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Ralf Baechle <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2008-02-06 01:37:16 -08:00 • committed by Linus Torvalds
commit 9cfe015aa4
11 changed files with 41 additions and 10 deletions
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8
Documentation/filesystems/proc.txt
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@ -1029,6 +1029,14 @@ nr_inodes
Denotes the number of inodes the system has allocated. This number will
grow and shrink dynamically.
nr_open
-------
Denotes the maximum number of file-handles a process can
allocate. Default value is 1024*1024 (1048576) which should be
enough for most machines. Actual limit depends on RLIMIT_NOFILE
resource limit.
nr_free_inodes
--------------