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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>
This commit is contained in:
Vaibhav Nagarnaik 2012-05-03 18:59:52 -07:00 committed by Steven Rostedt
parent 0a3d7ce7e6
commit 71babb2705
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/trace.c
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@ -2669,10 +2669,12 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
if (cpumask_test_cpu(cpu, tracing_cpumask) && if (cpumask_test_cpu(cpu, tracing_cpumask) &&
!cpumask_test_cpu(cpu, tracing_cpumask_new)) { !cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_inc(&global_trace.data[cpu]->disabled); atomic_inc(&global_trace.data[cpu]->disabled);
ring_buffer_record_disable_cpu(global_trace.buffer, cpu);
} }
if (!cpumask_test_cpu(cpu, tracing_cpumask) && if (!cpumask_test_cpu(cpu, tracing_cpumask) &&
cpumask_test_cpu(cpu, tracing_cpumask_new)) { cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_dec(&global_trace.data[cpu]->disabled); atomic_dec(&global_trace.data[cpu]->disabled);
ring_buffer_record_enable_cpu(global_trace.buffer, cpu);
} }
} }
arch_spin_unlock(&ftrace_max_lock); arch_spin_unlock(&ftrace_max_lock);