tree a8a1e7f035903796e6b8f626add8d269bf989a35
parent 35f3d14dbbc58447c61e38a162ea10add6b31dc7
author Jens Axboe <jens.axboe@oracle.com> 1274295796 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1274469172 +0200

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>