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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 00:28:39 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-19 00:28:39 +0400
commit758338e960ebe8ac3bef7ae11ff830bc2f9c655c (patch)
treedbaea6140ada681baa462a2818095bcea0160108 /kernel
parent224394ad75711042c6d362c9dbc9874b476edbc0 (diff)
parentbf3071f5a054db9e5bab873355d27a7330ce5187 (diff)
downloadlinux-758338e960ebe8ac3bef7ae11ff830bc2f9c655c.tar.xz
Merge branch 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull minor tracing updates and fixes from Steven Rostedt: "It seems that one of my old pull requests have slipped through. The changes are contained to just the files that I maintain, and are changes from others that I told I would get into this merge window. They have already been in linux-next for several weeks, and should be well tested." * 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Remove unnecessary WARN_ONCE's from tracing_buffers_splice_read tracing: Remove unneeded checks from the stack tracer tracing: Add a resize function to make one buffer equivalent to another buffer
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace.c60
-rw-r--r--kernel/trace/trace_stack.c4
2 files changed, 31 insertions, 33 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 61e081b4ba11..e5125677efa0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3034,6 +3034,31 @@ static void set_buffer_entries(struct trace_array *tr, unsigned long val)
tr->data[cpu]->entries = val;
}
+/* resize @tr's buffer to the size of @size_tr's entries */
+static int resize_buffer_duplicate_size(struct trace_array *tr,
+ struct trace_array *size_tr, int cpu_id)
+{
+ int cpu, ret = 0;
+
+ if (cpu_id == RING_BUFFER_ALL_CPUS) {
+ for_each_tracing_cpu(cpu) {
+ ret = ring_buffer_resize(tr->buffer,
+ size_tr->data[cpu]->entries, cpu);
+ if (ret < 0)
+ break;
+ tr->data[cpu]->entries = size_tr->data[cpu]->entries;
+ }
+ } else {
+ ret = ring_buffer_resize(tr->buffer,
+ size_tr->data[cpu_id]->entries, cpu_id);
+ if (ret == 0)
+ tr->data[cpu_id]->entries =
+ size_tr->data[cpu_id]->entries;
+ }
+
+ return ret;
+}
+
static int __tracing_resize_ring_buffer(unsigned long size, int cpu)
{
int ret;
@@ -3058,23 +3083,8 @@ static int __tracing_resize_ring_buffer(unsigned long size, int cpu)
ret = ring_buffer_resize(max_tr.buffer, size, cpu);
if (ret < 0) {
- int r = 0;
-
- if (cpu == RING_BUFFER_ALL_CPUS) {
- int i;
- for_each_tracing_cpu(i) {
- r = ring_buffer_resize(global_trace.buffer,
- global_trace.data[i]->entries,
- i);
- if (r < 0)
- break;
- }
- } else {
- r = ring_buffer_resize(global_trace.buffer,
- global_trace.data[cpu]->entries,
- cpu);
- }
-
+ int r = resize_buffer_duplicate_size(&global_trace,
+ &global_trace, cpu);
if (r < 0) {
/*
* AARGH! We are left with different
@@ -3212,17 +3222,11 @@ static int tracing_set_tracer(const char *buf)
topts = create_trace_option_files(t);
if (t->use_max_tr) {
- int cpu;
/* we need to make per cpu buffer sizes equivalent */
- for_each_tracing_cpu(cpu) {
- ret = ring_buffer_resize(max_tr.buffer,
- global_trace.data[cpu]->entries,
- cpu);
- if (ret < 0)
- goto out;
- max_tr.data[cpu]->entries =
- global_trace.data[cpu]->entries;
- }
+ ret = resize_buffer_duplicate_size(&max_tr, &global_trace,
+ RING_BUFFER_ALL_CPUS);
+ if (ret < 0)
+ goto out;
}
if (t->init) {
@@ -4271,13 +4275,11 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
return -ENOMEM;
if (*ppos & (PAGE_SIZE - 1)) {
- WARN_ONCE(1, "Ftrace: previous read must page-align\n");
ret = -EINVAL;
goto out;
}
if (len & (PAGE_SIZE - 1)) {
- WARN_ONCE(1, "Ftrace: splice_read should page-align\n");
if (len < PAGE_SIZE) {
ret = -EINVAL;
goto out;
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 0c1b165778e5..42ca822fc701 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -33,7 +33,6 @@ static unsigned long max_stack_size;
static arch_spinlock_t max_stack_lock =
(arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
-static int stack_trace_disabled __read_mostly;
static DEFINE_PER_CPU(int, trace_active);
static DEFINE_MUTEX(stack_sysctl_mutex);
@@ -116,9 +115,6 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip,
{
int cpu;
- if (unlikely(!ftrace_enabled || stack_trace_disabled))
- return;
-
preempt_disable_notrace();
cpu = raw_smp_processor_id();