Commit 71babb27 authored May 03, 2012 by Vaibhav Nagarnaik Committed by Steven Rostedt May 16, 2012

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@google.com



Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Laurent Chavey <chavey@google.com>
Cc: Justin Teravest <teravest@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

parent 0a3d7ce7

kernel/trace/trace.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);