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| author | Pavel Emelyanov <xemul@parallels.com> | 2012-01-12 17:20:27 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-12 20:13:11 -0800 |
| commit | b8f566b04d3cddd192cfd2418ae6d54ac6353792 (patch) | |
| tree | 32a5bf86548cd43feff4822d800b6a99e157b5d7 /Documentation/sysctl | |
| parent | f5138e42211d4e8bfbd6ac5b3816348da1533433 (diff) | |
| download | lwn-b8f566b04d3cddd192cfd2418ae6d54ac6353792.tar.gz lwn-b8f566b04d3cddd192cfd2418ae6d54ac6353792.zip | |
sysctl: add the kernel.ns_last_pid control
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>
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 6d8cd8b2c30d..8c20fbd8b42d 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -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, |