linux-kernel - [PATCH 22/24] Documentation: add documentation for task

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Message-Id: <1436172445-6979-23-git-send-email-avagin@openvz.org>
Date:	Mon,  6 Jul 2015 11:47:23 +0300
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-api@...r.kernel.org, Andrey Vagin <avagin@...nvz.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Odintsov <pavel.odintsov@...il.com>
Subject: [PATCH 22/24] Documentation: add documentation for task_diag

Signed-off-by: Andrey Vagin <avagin@...nvz.org>
---
 Documentation/accounting/task_diag.txt | 53 ++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Documentation/accounting/task_diag.txt

diff --git a/Documentation/accounting/task_diag.txt b/Documentation/accounting/task_diag.txt
new file mode 100644
index 0000000..635b322
--- /dev/null
+++ b/Documentation/accounting/task_diag.txt
@@ -0,0 +1,53 @@
+Taskdiag is a netlink interface for getting task properties. Compared to procfs,
+it is faster, more flexible and provides data in a binary format. Taskdiag was
+created using the basic idea of socket_diag.
+
+Interface
+---------
+
+The user-kernel interface is encapsulated in include/uapi/linux/task_diag.h
+
+Request
+-------
+
+A request is described by the task_diag_pid structure.
+
+struct task_diag_pid {
+	__u64	show_flags;	/* TASK_DIAG_SHOW_* */
+	__u64	dump_stratagy;	/* TASK_DIAG_DUMP_* */
+
+	__u32	pid;
+};
+
+dump_stratagy specifies a group of processes:
+/* per-process strategies */
+TASK_DIAG_DUMP_CHILDREN	- all children
+TASK_DIAG_DUMP_THREAD	- all threads
+TASK_DIAG_DUMP_ONE	- one process
+/* system wide strategies (the pid fiel is ignored) */
+TASK_DIAG_DUMP_ALL	  - all processes
+TASK_DIAG_DUMP_ALL_THREAD - all threads
+
+show_flags specifies which information are required.  If we set the
+TASK_DIAG_SHOW_BASE flag, the response message will contain the TASK_DIAG_BASE
+attribute which is described by the task_diag_base structure.
+
+In future, it can be extended by optional attributes. The request describes
+which task properties are required and for which processes they are required
+for.
+
+Response
+--------
+
+A response can be divided into a few netlink packets if the NETLINK_DUMP has
+been set in a request. Each task is described by a message. Each message
+contains the TASK_DIAG_PID attribute and optional attributes which have been
+requested. A message can be divided into a few parts if it doesn’t fit into a
+current netlink packet. In this case, the first message in the next packet
+contains the same PID and attributes which doesn’t  fit into the previous
+message.
+
+Examples
+--------
+
+A few examples can be found in tools/testing/selftests/task_diag/
-- 
2.1.0

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