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Date: Tue, 23 Dec 2014 18:20:39 +0800 From: Chen Hanxiao <chenhanxiao@...fujitsu.com> To: "Eric W. Biederman" <ebiederm@...ssion.com>, Serge Hallyn <serge.hallyn@...ntu.com>, Andrew Morton <akpm@...ux-foundation.org>, Pavel Emelyanov <xemul@...allels.com> CC: <containers@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>, David Howells <dhowells@...hat.com>, Vasiliy Kulikov <segooon@...il.com>, Mateusz Guzik <mguzik@...hat.com>, Oleg Nesterov <oleg@...hat.com>, Richard Weinberger <richard.weinberger@...il.com> Subject: [PATCH v9 3/3] Documentation: add docs for /proc/pidns_hierarchy Signed-off-by: Chen Hanxiao <chenhanxiao@...fujitsu.com> --- Documentation/namespaces/pidns-hierarchy.txt | 51 ++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/namespaces/pidns-hierarchy.txt diff --git a/Documentation/namespaces/pidns-hierarchy.txt b/Documentation/namespaces/pidns-hierarchy.txt new file mode 100644 index 0000000..feb92a9 --- /dev/null +++ b/Documentation/namespaces/pidns-hierarchy.txt @@ -0,0 +1,51 @@ +This document is about how to use pid namespace hierarchy procfs. + +We knew whether two pids living in the same pid namespace +by /proc/PID/ns/pid, but their relationships +between pids were unknown: +we couldn't tell that one pid was another one's parent/siblings... +But /proc/pidns_hierarchy could tell us the answer. + +/proc/pidns_hierarchy will show the hierarchy of pid namespace +in the form of: + +<init_PID> <parent_of_init_PID> <relative PID level> + +init_PID: child reaper in a pid namespace +parent_of_init_PID: init_PID's parent, child reaper too +relative PID level: pid level relative to caller's ns, + started from '1'. + +Here is a chart to describe the relationship between +some pids: + + init_pid_ns level 0 + | + 1 + | +┌────────────┐ +ns1 ns2 level 1 +| | +1550 18060 + | + | + ns3 level 2 + | + 18102 + | + ┌──────────┐ + ns4 ns5 level 3 + | | + 1534 1600 + +It will be showed by /proc/pidns_hierarchy as below: + +#cat /proc/pidns_hierarchy +18060 1 1 +18102 18060 2 +1534 18102 3 +1600 18102 3 +1550 1 1 + +Note: numbers in column 1 are pid numbers in current ns, + they represent the pid '1' in different ns -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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