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authorCyrill Gorcunov <gorcunov@openvz.org>2012-06-01 01:26:43 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-01 02:49:32 +0200
commit818411616baf46ceba0cff6f05af3a9b294734f7 (patch)
treeb6e338e20d4a45b6a05ffa37e6af33e0cc1b50c0 /Documentation/filesystems/xip.txt
parentsysctl: make kernel.ns_last_pid control dependent on CHECKPOINT_RESTORE (diff)
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fs, proc: introduce /proc/<pid>/task/<tid>/children entry
When we do checkpoint of a task we need to know the list of children the task, has but there is no easy and fast way to generate reverse parent->children chain from arbitrary <pid> (while a parent pid is provided in "PPid" field of /proc/<pid>/status). So instead of walking over all pids in the system (creating one big process tree in memory, just to figure out which children a task has) -- we add explicit /proc/<pid>/task/<tid>/children entry, because the kernel already has this kind of information but it is not yet exported. This is a first level children, not the whole process tree. Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Serge Hallyn <serge.hallyn@canonical.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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