Messages in this thread Patch in this message | | | From | Vaibhav Nagarnaik <> | Subject | [PATCH v5 4/4] trace: change CPU ring buffer state from tracing_cpumask | Date | Thu, 2 Feb 2012 12:00:44 -0800 |
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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 <vnagarnaik@google.com> --- 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 abf1108..e25672e 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2592,10 +2592,12 @@ 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); -- 1.7.7.3
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