Commit-ID: 71babb2705e2203a64c27ede13ae3508a0d2c16c Gitweb: http://git.kernel.org/tip/71babb2705e2203a64c27ede13ae3508a0d2c16c Author: Vaibhav Nagarnaik <vnagarnaik@xxxxxxxxxx> AuthorDate: Thu, 3 May 2012 18:59:52 -0700 Committer: Steven Rostedt <rostedt@xxxxxxxxxxx> CommitDate: Wed, 16 May 2012 19:50:38 -0400 tracing: change CPU ring buffer state from tracing_cpumask 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. Link: http://lkml.kernel.org/r/1336096792-25373-3-git-send-email-vnagarnaik@xxxxxxxxxx Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Laurent Chavey <chavey@xxxxxxxxxx> Cc: Justin Teravest <teravest@xxxxxxxxxx> Cc: David Sharp <dhsharp@xxxxxxxxxx> Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@xxxxxxxxxx> Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx> --- 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 0ed4df0..08a08ba 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2669,10 +2669,12 @@ 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); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html