Messages in this thread | | | From | Pedro Alves <> | Subject | Re: [rfc 2/3] fs, proc: Introduce the Children: line in /proc/<pid>/status | Date | Fri, 2 Dec 2011 12:41:04 +0000 |
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On Friday 02 December 2011 00:40:10, KAMEZAWA Hiroyuki wrote: > > What about this one? > > --- > > fs, proc: Introduce the /proc/<pid>/children entry > > > > There is no easy way to make a reverse parent->children chain > > from the task status, in turn children->parent provided with "PPid" > > field. > > > > So instead of walking over all pids in system to figure out what > > children the task have -- we add explicit /proc/<pid>/children entry, > > since kernel already knows this kind of information but it was not > > yet exported. > > > > Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> > > Cc: Pavel Emelyanov <xemul@parallels.com> > > Cc: Serge Hallyn <serge.hallyn@canonical.com> > > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> > > Yes, I like /children file. other points seems to be pointed out by other > reviewers.
Any reason this is a file instead of a directory like /proc/PID/task/ ?
$ sudo ls /proc/8167/task/ 8167 854 855 856 857 858 859 $ sudo ls /proc/8167/task/855/ attr clear_refs cpuset exe io loginuid mountinfo oom_adj pagemap sched smaps statm wchan auxv cmdline cwd fd latency maps mounts oom_score personality schedstat stack status cgroup comm environ fdinfo limits mem numa_maps oom_score_adj root sessionid stat syscall
Much easier to follow the chain from the command line this way.
-- Pedro Alves
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