From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753004AbdGFXAn (ORCPT ); Thu, 6 Jul 2017 19:00:43 -0400 Received: from mail-pg0-f54.google.com ([74.125.83.54]:35706 "EHLO mail-pg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752890AbdGFXAl (ORCPT ); Thu, 6 Jul 2017 19:00:41 -0400 From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: mikesart@gmail.com, Joel Fernandes , kernel-team@android.com, Steven Rostedt , Ingo Molnar Subject: [PATCH 2/3] tracing: Treat recording tgid for idle task as a success Date: Thu, 6 Jul 2017 16:00:22 -0700 Message-Id: <20170706230023.17942-2-joelaf@google.com> X-Mailer: git-send-email 2.13.2.725.g09c95d1e9-goog In-Reply-To: <20170706230023.17942-1-joelaf@google.com> References: <20170706230023.17942-1-joelaf@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently we stop recording tgid for non-idle tasks when switching from/to idle task since we treat that as a record failure. Fix that by treat recording of tgid for idle task as a success. Cc: kernel-team@android.com Cc: Steven Rostedt Cc: Ingo Molnar Reported-by: Michael Sartain Signed-off-by: Joel Fernandes --- kernel/trace/trace.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 7a0c493723a9..363924f90e2f 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2006,7 +2006,11 @@ int trace_find_tgid(int pid) static int trace_save_tgid(struct task_struct *tsk) { - if (unlikely(!tgid_map || !tsk->pid || tsk->pid > PID_MAX_DEFAULT)) + /* treat recording of idle task as a success */ + if (!tsk->pid) + return 1; + + if (unlikely(!tgid_map || tsk->pid > PID_MAX_DEFAULT)) return 0; tgid_map[tsk->pid] = tsk->tgid; -- 2.13.2.725.g09c95d1e9-goog