From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759366Ab2DYVSy (ORCPT ); Wed, 25 Apr 2012 17:18:54 -0400 Received: from mail-qc0-f202.google.com ([209.85.216.202]:51015 "EHLO mail-qc0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759113Ab2DYVS3 (ORCPT ); Wed, 25 Apr 2012 17:18:29 -0400 From: Vaibhav Nagarnaik To: Steven Rostedt , Frederic Weisbecker , Ingo Molnar Cc: Laurent Chavey , Justin Teravest , David Sharp , linux-kernel@vger.kernel.org, Vaibhav Nagarnaik Subject: [PATCH v6 3/3] trace: change CPU ring buffer state from tracing_cpumask Date: Wed, 25 Apr 2012 14:18:24 -0700 Message-Id: <1335388704-26790-3-git-send-email-vnagarnaik@google.com> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1335388704-26790-1-git-send-email-vnagarnaik@google.com> References: <1328212844-11889-2-git-send-email-vnagarnaik@google.com> <1335388704-26790-1-git-send-email-vnagarnaik@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org According to Documentation/trace/ftrace.txt: tracing_cpumask: This is a mask that lets the user only trace on specified CPUS. The format is a hex string representing the CPUS. The tracing_cpumask currently doesn't affect the tracing state of per-CPU ring buffers. This patch enables/disables CPU recording as its corresponding bit in tracing_cpumask is set/unset. Signed-off-by: Vaibhav Nagarnaik --- kernel/trace/trace.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 401d77a..6d4c2dd 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2650,10 +2650,12 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf, if (cpumask_test_cpu(cpu, tracing_cpumask) && !cpumask_test_cpu(cpu, tracing_cpumask_new)) { atomic_inc(&global_trace.data[cpu]->disabled); + ring_buffer_record_disable_cpu(global_trace.buffer, cpu); } if (!cpumask_test_cpu(cpu, tracing_cpumask) && cpumask_test_cpu(cpu, tracing_cpumask_new)) { atomic_dec(&global_trace.data[cpu]->disabled); + ring_buffer_record_enable_cpu(global_trace.buffer, cpu); } } arch_spin_unlock(&ftrace_max_lock); -- 1.7.7.3