lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sysctl: add the kernel.ns_last_pid control

Browse Source 
The sysctl works on the current task's pid namespace, getting and setting
its last_pid field.

Writing is allowed for CAP_SYS_ADMIN-capable tasks thus making it possible
to create a task with desired pid value.  This ability is required badly
for the checkpoint/restore in userspace.

This approach suits all the parties for now.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelyanov
2012-01-12 17:20:27 -08:00
committed by Linus Torvalds
parent f5138e4221
commit b8f566b04d
3 changed files with 42 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/sysctl/kernel.txt
View File

@@ -415,6 +415,14 @@ PIDs of value pid_max or larger are not allocated.
==============================================================
ns_last_pid:
The last pid allocated in the current (the one task using this sysctl
lives in) pid namespace. When selecting a pid for a next task on fork
kernel tries to allocate a number starting from this one.
==============================================================
powersave-nap: (PPC only)
If set, Linux-PPC will use the 'nap' mode of powersaving,