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| author | Jens Axboe <jens.axboe@oracle.com> | 2010-05-19 21:03:16 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-21 21:12:52 +0200 |
| commit | b492e95be0ae672922f4734acf3f5d35c30be948 (patch) | |
| tree | a8a1e7f035903796e6b8f626add8d269bf989a35 /kernel/sysctl.c | |
| parent | pipe: add support for shrinking and growing pipes (diff) | |
| download | linux-b492e95be0ae672922f4734acf3f5d35c30be948.tar.xz linux-b492e95be0ae672922f4734acf3f5d35c30be948.zip | |
pipe: set lower and upper limit on max pages in the pipe page array
We need at least two to guarantee proper POSIX behaviour, so
never allow a smaller limit than that.
Also expose a /proc/sys/fs/pipe-max-pages sysctl file that allows
root to define a sane upper limit. Make it default to 16 times the
default size, which is 16 pages.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 8686b0f5fc12..c649d1c5fe09 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -52,6 +52,7 @@ #include <linux/slow-work.h> #include <linux/perf_event.h> #include <linux/kprobes.h> +#include <linux/pipe_fs_i.h> #include <asm/uaccess.h> #include <asm/processor.h> @@ -1423,6 +1424,14 @@ static struct ctl_table fs_table[] = { .child = binfmt_misc_table, }, #endif + { + .procname = "pipe-max-pages", + .data = &pipe_max_pages, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec_minmax, + .extra1 = &two, + }, /* * NOTE: do not add new entries to this table unless you have read * Documentation/sysctl/ctl_unnumbered.txt |