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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
fs/file.c
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@ -24,6 +24,8 @@ struct fdtable_defer {
struct fdtable *next;
};
int sysctl_nr_open __read_mostly = 1024*1024;
/*
* We use this list to defer free fdtables that have vmalloced
* sets/arrays. By keeping a per-cpu list, we avoid having to embed
@ -147,8 +149,8 @@ static struct fdtable * alloc_fdtable(unsigned int nr)
nr /= (1024 / sizeof(struct file *));
nr = roundup_pow_of_two(nr + 1);
nr *= (1024 / sizeof(struct file *));
if (nr > NR_OPEN)
nr = NR_OPEN;
if (nr > sysctl_nr_open)
nr = sysctl_nr_open;
fdt = kmalloc(sizeof(struct fdtable), GFP_KERNEL);
if (!fdt)
@ -233,7 +235,7 @@ int expand_files(struct files_struct *files, int nr)
if (nr < fdt->max_fds)
return 0;
/* Can we expand? */
if (nr >= NR_OPEN)
if (nr >= sysctl_nr_open)
return -EMFILE;
/* All good, so we try */