This is a note to let you know that I've just added the patch titled
tracing: change CPU ring buffer state from tracing_cpumask
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-change-cpu-ring-buffer-state-from-tracing_cpumask.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 71babb2705e2203a64c27ede13ae3508a0d2c16c Mon Sep 17 00:00:00 2001
From: Vaibhav Nagarnaik <[email protected]>
Date: Thu, 3 May 2012 18:59:52 -0700
Subject: tracing: change CPU ring buffer state from tracing_cpumask
From: Vaibhav Nagarnaik <[email protected]>
commit 71babb2705e2203a64c27ede13ae3508a0d2c16c upstream.
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/[email protected]
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Laurent Chavey <[email protected]>
Cc: Justin Teravest <[email protected]>
Cc: David Sharp <[email protected]>
Signed-off-by: Vaibhav Nagarnaik <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/trace/trace.c | 2 ++
1 file changed, 2 insertions(+)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2648,10 +2648,12 @@ tracing_cpumask_write(struct file *filp,
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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.4/tracing-change-cpu-ring-buffer-state-from-tracing_cpumask.patch
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