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authorOleg Nesterov <oleg@redhat.com>2013-07-23 17:26:13 +0200
committerSteven Rostedt <rostedt@rostedt.homelinux.com>2013-07-24 11:22:53 -0400
commit9c01fe4593db123c5a72dc36f0400f776e92c954 (patch)
tree717207fb5fbd5b12c2aa7bba5457f79af18219a5
parent6484c71cbc170634fa131b6d022d86d61686b88b (diff)
downloadop-kernel-dev-9c01fe4593db123c5a72dc36f0400f776e92c954.zip
op-kernel-dev-9c01fe4593db123c5a72dc36f0400f776e92c954.tar.gz
tracing: Kill trace_cpu struct/members
After the previous changes trace_array_cpu->trace_cpu and trace_array->trace_cpu becomes write-only. Remove these members and kill "struct trace_cpu" as well. As a side effect this also removes memset(per_cpu_memory, 0). It was not needed, alloc_percpu() returns zero-filled memory. Link: http://lkml.kernel.org/r/20130723152613.GA23741@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--kernel/trace/trace.c21
-rw-r--r--kernel/trace/trace.h8
2 files changed, 0 insertions, 29 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index dd7780d..69cba47 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -5865,17 +5865,6 @@ struct dentry *trace_instance_dir;
static void
init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer);
-static void init_trace_buffers(struct trace_array *tr, struct trace_buffer *buf)
-{
- int cpu;
-
- for_each_tracing_cpu(cpu) {
- memset(per_cpu_ptr(buf->data, cpu), 0, sizeof(struct trace_array_cpu));
- per_cpu_ptr(buf->data, cpu)->trace_cpu.cpu = cpu;
- per_cpu_ptr(buf->data, cpu)->trace_cpu.tr = tr;
- }
-}
-
static int
allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size)
{
@@ -5893,8 +5882,6 @@ allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size
return -ENOMEM;
}
- init_trace_buffers(tr, buf);
-
/* Allocate the first page for all buffers */
set_buffer_entries(&tr->trace_buffer,
ring_buffer_size(tr->trace_buffer.buffer, 0));
@@ -5961,10 +5948,6 @@ static int new_instance_create(const char *name)
if (allocate_trace_buffers(tr, trace_buf_size) < 0)
goto out_free_tr;
- /* Holder for file callbacks */
- tr->trace_cpu.cpu = RING_BUFFER_ALL_CPUS;
- tr->trace_cpu.tr = tr;
-
tr->dir = debugfs_create_dir(name, trace_instance_dir);
if (!tr->dir)
goto out_free_tr;
@@ -6438,10 +6421,6 @@ __init static int tracer_alloc_buffers(void)
global_trace.flags = TRACE_ARRAY_FL_GLOBAL;
- /* Holder for file callbacks */
- global_trace.trace_cpu.cpu = RING_BUFFER_ALL_CPUS;
- global_trace.trace_cpu.tr = &global_trace;
-
INIT_LIST_HEAD(&global_trace.systems);
INIT_LIST_HEAD(&global_trace.events);
list_add(&global_trace.list, &ftrace_trace_arrays);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index e7d643b..afaae41 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -130,19 +130,12 @@ enum trace_flag_type {
struct trace_array;
-struct trace_cpu {
- struct trace_array *tr;
- struct dentry *dir;
- int cpu;
-};
-
/*
* The CPU trace array - it consists of thousands of trace entries
* plus some other descriptor data: (for example which task started
* the trace, etc.)
*/
struct trace_array_cpu {
- struct trace_cpu trace_cpu;
atomic_t disabled;
void *buffer_page; /* ring buffer spare */
@@ -196,7 +189,6 @@ struct trace_array {
bool allocated_snapshot;
#endif
int buffer_disabled;
- struct trace_cpu trace_cpu; /* place holder */
#ifdef CONFIG_FTRACE_SYSCALLS
int sys_refcount_enter;
int sys_refcount_exit;
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