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ring-buffer: Merge separate resize loops 

There are 2 separate loops to resize cpu buffers that are online and
offline. Merge them to make the code look better.

Also change the name from update_completion to update_done to allow
shorter lines.

Link: http://lkml.kernel.org/r/1337372991-14783-1-git-send-email-vnagarnaik@google.com

Cc: Laurent Chavey <chavey@google.com>
Cc: Justin Teravest <teravest@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Vaibhav Nagarnaik 2012-05-18 13:29:51 -07:00 committed by Steven Rostedt
parent b732d439cb
commit 05fdd70d2f
1 changed files with 15 additions and 26 deletions
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41
kernel/trace/ring_buffer.c
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@ -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: