From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753264AbaE1KY0 (ORCPT ); Wed, 28 May 2014 06:24:26 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:47681 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752826AbaE1KYY (ORCPT ); Wed, 28 May 2014 06:24:24 -0400 X-IronPort-AV: E=Sophos;i="4.98,927,1392134400"; d="scan'208";a="31124538" From: Chen Hanxiao To: , CC: Andrew Morton , "Eric W. Biederman" , Serge Hallyn , "Daniel P. Berrange" , Oleg Nesterov , Al Viro , David Howells , Richard Weinberger , Chen Hanxiao Subject: [PATCH v2] /proc/pid/status: show all sets of pid according to ns Date: Wed, 28 May 2014 18:24:43 +0800 Message-ID: <1401272683-1659-1-git-send-email-chenhanxiao@cn.fujitsu.com> X-Mailer: git-send-email 1.9.0 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need a direct method of getting the pid inside containers. If some issues occurred inside container guest, host user could not know which process is in trouble just by guest pid: the users of container guest only knew the pid inside containers. This will bring obstacle for trouble shooting. This patch adds two fields: NStgid and NSpid. a) In init_pid_ns, nothing changed; b) In one pidns, will tell the pid inside containers: NStgid: 1628 9 3 NSpid: 1628 9 3 ** Process id is 1628 in level 0, 9 in level 1, 3 in level 2. c) If pidns is nested, it depends on which pidns are you in. NStgid: 9 3 NSpid: 9 3 ** Views from level 1 Signed-off-by: Chen Hanxiao --- v2: add two new fields: NStgid and NSpid. keep fields of Tgid and Pid unchanged for back compatibility. fs/proc/array.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/proc/array.c b/fs/proc/array.c index 64db2bc..9b7e65c 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -193,6 +193,15 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, from_kgid_munged(user_ns, cred->egid), from_kgid_munged(user_ns, cred->sgid), from_kgid_munged(user_ns, cred->fsgid)); + seq_puts(m, "NStgid:"); + for (g = ns->level; g <= pid->level; g++) + seq_printf(m, "\t%d ", + task_tgid_nr_ns(p, pid->numbers[g].ns)); + seq_puts(m, "\nNSpid:"); + for (g = ns->level; g <= pid->level; g++) + seq_printf(m, "\t%d ", + task_pid_nr_ns(p, pid->numbers[g].ns)); + seq_putc(m, '\n'); task_lock(p); if (p->files) -- 1.9.0