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Merge branch 'tip/perf/core-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace into perf/core

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This commit is contained in:
Ingo Molnar 2012-05-21 09:44:36 +02:00
commit 6f5e3577d4
2 changed files with 17 additions and 29 deletions
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41
kernel/trace/ring_buffer.c
View File

@ -473,7 +473,7 @@ struct ring_buffer_per_cpu {
int nr_pages_to_update;
struct list_head new_pages; /* new pages to add */
struct work_struct update_pages_work;
struct completion update_completion;
struct completion update_done;
};
struct ring_buffer {
@ -1058,7 +1058,7 @@ rb_allocate_cpu_buffer(struct ring_buffer *buffer, int nr_pages, int cpu)
lockdep_set_class(&cpu_buffer->reader_lock, buffer->reader_lock_key);
cpu_buffer->lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
INIT_WORK(&cpu_buffer->update_pages_work, update_pages_handler);
init_completion(&cpu_buffer->update_completion);
init_completion(&cpu_buffer->update_done);
bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
GFP_KERNEL, cpu_to_node(cpu));
@ -1461,7 +1461,7 @@ static void update_pages_handler(struct work_struct *work)
struct ring_buffer_per_cpu *cpu_buffer = container_of(work,
struct ring_buffer_per_cpu, update_pages_work);
rb_update_pages(cpu_buffer);
complete(&cpu_buffer->update_completion);
complete(&cpu_buffer->update_done);
}
/**
@ -1534,39 +1534,29 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size,
get_online_cpus();
/*
* Fire off all the required work handlers
* Look out for offline CPUs
*/
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
if (!cpu_buffer->nr_pages_to_update ||
!cpu_online(cpu))
continue;
schedule_work_on(cpu, &cpu_buffer->update_pages_work);
}
/*
* This loop is for the CPUs that are not online.
* We can't schedule anything on them, but it's not necessary
* We can't schedule on offline CPUs, but it's not necessary
* since we can change their buffer sizes without any race.
*/
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
if (!cpu_buffer->nr_pages_to_update ||
cpu_online(cpu))
if (!cpu_buffer->nr_pages_to_update)
continue;
rb_update_pages(cpu_buffer);
if (cpu_online(cpu))
schedule_work_on(cpu,
&cpu_buffer->update_pages_work);
else
rb_update_pages(cpu_buffer);
}
/* wait for all the updates to complete */
for_each_buffer_cpu(buffer, cpu) {
cpu_buffer = buffer->buffers[cpu];
if (!cpu_buffer->nr_pages_to_update ||
!cpu_online(cpu))
if (!cpu_buffer->nr_pages_to_update)
continue;
wait_for_completion(&cpu_buffer->update_completion);
/* reset this value */
if (cpu_online(cpu))
wait_for_completion(&cpu_buffer->update_done);
cpu_buffer->nr_pages_to_update = 0;
}
@ -1593,13 +1583,12 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size,
if (cpu_online(cpu_id)) {
schedule_work_on(cpu_id,
&cpu_buffer->update_pages_work);
wait_for_completion(&cpu_buffer->update_completion);
wait_for_completion(&cpu_buffer->update_done);
} else
rb_update_pages(cpu_buffer);
put_online_cpus();
/* reset this value */
cpu_buffer->nr_pages_to_update = 0;
put_online_cpus();
}
out:

5
kernel/trace/trace.c
View File

@ -763,8 +763,6 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
* Register a new plugin tracer.
*/
int register_tracer(struct tracer *type)
__releases(kernel_lock)
__acquires(kernel_lock)
{
struct tracer *t;
int ret = 0;
@ -5114,7 +5112,8 @@ __init static int tracer_alloc_buffers(void)
max_tr.data[i] = &per_cpu(max_tr_data, i);
}
set_buffer_entries(&global_trace, ring_buf_size);
set_buffer_entries(&global_trace,
ring_buffer_size(global_trace.buffer, 0));
#ifdef CONFIG_TRACER_MAX_TRACE
set_buffer_entries(&max_tr, 1);
#endif