From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752123Ab1JLBUo (ORCPT ); Tue, 11 Oct 2011 21:20:44 -0400 Received: from smtp-out.google.com ([74.125.121.67]:29703 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751424Ab1JLBUV (ORCPT ); Tue, 11 Oct 2011 21:20:21 -0400 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=qvOayvGYjjolpxGuFi42mBiKFl+G6JYe8KGxG9+g8f9PKLEi2pxwFdFEiA9EcoeAm hDjleC6y5jjCmyUUpWwuQ== From: Vaibhav Nagarnaik To: Steven Rostedt , Frederic Weisbecker , Ingo Molnar Cc: Michael Rubin , David Sharp , linux-kernel@vger.kernel.org, Vaibhav Nagarnaik Subject: [PATCH v4 4/4] trace: change CPU ring buffer state from tracing_cpumask Date: Tue, 11 Oct 2011 18:20:10 -0700 Message-Id: <1318382410-14967-4-git-send-email-vnagarnaik@google.com> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1314062244-2997-1-git-send-email-vnagarnaik@google.com> References: <1314062244-2997-1-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 736518f..a8999bd 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2529,10 +2529,12 @@ 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); -- 1.7.3.1