From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754599AbZCXDFY (ORCPT ); Mon, 23 Mar 2009 23:05:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753343AbZCXDFI (ORCPT ); Mon, 23 Mar 2009 23:05:08 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:56179 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753244AbZCXDFH (ORCPT ); Mon, 23 Mar 2009 23:05:07 -0400 Message-ID: <49C84D65.9050606@cn.fujitsu.com> Date: Tue, 24 Mar 2009 11:03:01 +0800 From: Lai Jiangshan User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 To: Steven Rostedt , Ingo Molnar , LKML , Frederic Weisbecker Subject: [PATCH] ftrace: show virtual PID Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When current namespace is not the global namespace, pid read from set_ftrace_pid is no correct. # ~/newpid_namespace_run bash # echo $$ 1 # echo 1 > set_ftrace_pid # cat set_ftrace_pid 3756 Since we write virtual PID to set_ftrace_pid, we need get virtual PID when we read it. Signed-off-by: Lai Jiangshan --- diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 7847806..7d7f201 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2262,7 +2262,7 @@ ftrace_pid_read(struct file *file, char __user *ubuf, if (ftrace_pid_trace == ftrace_swapper_pid) r = sprintf(buf, "swapper tasks\n"); else if (ftrace_pid_trace) - r = sprintf(buf, "%u\n", pid_nr(ftrace_pid_trace)); + r = sprintf(buf, "%u\n", pid_vnr(ftrace_pid_trace)); else r = sprintf(buf, "no pid\n");