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authorKonstantin Khlebnikov <khlebnikov@openvz.org>2012-01-05 13:06:11 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-24 14:01:01 -0800
commite9aba5158a80098447ff207a452a3418ae7ee386 (patch)
treefb6dd19824f908746d597128d34093a301c005e7 /include/linux/idr.h
parenta4834c102f4a46808630cad1a545cb0706b3b0a2 (diff)
tty: rework pty count limiting
After adding devpts multiple-insrances sysctl kernel.pty.max limit pty count for each devpts instance independently, while kernel.pty.nr shows total pty count. This patch restores sysctl kernel.pty.max as global limit (4096 by default), adds pty reseve for main devpts (mounted without "newinstance" argument), and new sysctl to tune it: kernel.pty.reserve (1024 by default) Also it adds devpts mount option "max=%d" to limit pty count for each devpts instance independently. (by default NR_UNIX98_PTY_MAX == 2^20) Thus devpts instances in containers cannot eat up all available pty even if we didn't set any limits, while with "max" argument we can adjust limits more precisely. Plus, now open("/dev/ptmx") return -ENOSPC in case lack of pty indexes, this is more informative than -EIO. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/idr.h')
0 files changed, 0 insertions, 0 deletions