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authorVaibhav Nagarnaik <vnagarnaik@google.com>2012-05-04 01:59:52 (GMT)
committerSteven Rostedt <rostedt@goodmis.org>2012-05-16 23:50:38 (GMT)
commit71babb2705e2203a64c27ede13ae3508a0d2c16c (patch)
tree8274eb4b1b17872e38715e0f619669fcc2b06c8d /kernel/trace
parent0a3d7ce7e6caa8c39cb5184bd9047a01a40abc2a (diff)
downloadlinux-71babb2705e2203a64c27ede13ae3508a0d2c16c.tar.xz
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c2
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);