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ring-buffer: Make addition of pages in ring buffer atomic

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This patch adds the capability to add new pages to a ring buffer
atomically while write operations are going on. This makes it possible
to expand the ring buffer size without reinitializing the ring buffer.

The new pages are attached between the head page and its previous page.

Link: http://lkml.kernel.org/r/1336096792-25373-2-git-send-email-vnagarnaik@google.com

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.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 2012-05-03 18:59:51 -07:00 committed by Steven Rostedt
parent 83f40318da
commit 5040b4b7bc
1 changed files with 79 additions and 27 deletions
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106
kernel/trace/ring_buffer.c
View File

@ -1252,7 +1252,7 @@ static inline unsigned long rb_page_write(struct buffer_page *bpage)
return local_read(&bpage->write) & RB_WRITE_MASK;
}
static void
static int
rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned int nr_pages)
{
struct list_head *tail_page, *to_remove, *next_page;
@ -1359,46 +1359,97 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned int nr_pages)
} while (to_remove_page != last_page);
RB_WARN_ON(cpu_buffer, nr_removed);
return nr_removed == 0;
}
static void
rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
struct list_head *pages, unsigned nr_pages)
static int
rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer)
{
struct buffer_page *bpage;
struct list_head *p;
unsigned i;
struct list_head *pages = &cpu_buffer->new_pages;
int retries, success;
raw_spin_lock_irq(&cpu_buffer->reader_lock);
/* stop the writers while inserting pages */
atomic_inc(&cpu_buffer->record_disabled);
rb_head_page_deactivate(cpu_buffer);
/*
* We are holding the reader lock, so the reader page won't be swapped
* in the ring buffer. Now we are racing with the writer trying to
* move head page and the tail page.
* We are going to adapt the reader page update process where:
* 1. We first splice the start and end of list of new pages between
* the head page and its previous page.
* 2. We cmpxchg the prev_page->next to point from head page to the
* start of new pages list.
* 3. Finally, we update the head->prev to the end of new list.
*
* We will try this process 10 times, to make sure that we don't keep
* spinning.
*/
retries = 10;
success = 0;
while (retries--) {
struct list_head *head_page, *prev_page, *r;
struct list_head *last_page, *first_page;
struct list_head *head_page_with_bit;
for (i = 0; i < nr_pages; i++) {
if (RB_WARN_ON(cpu_buffer, list_empty(pages)))
goto out;
p = pages->next;
bpage = list_entry(p, struct buffer_page, list);
list_del_init(&bpage->list);
list_add_tail(&bpage->list, cpu_buffer->pages);
head_page = &rb_set_head_page(cpu_buffer)->list;
prev_page = head_page->prev;
first_page = pages->next;
last_page = pages->prev;
head_page_with_bit = (struct list_head *)
((unsigned long)head_page | RB_PAGE_HEAD);
last_page->next = head_page_with_bit;
first_page->prev = prev_page;
r = cmpxchg(&prev_page->next, head_page_with_bit, first_page);
if (r == head_page_with_bit) {
/*
* yay, we replaced the page pointer to our new list,
* now, we just have to update to head page's prev
* pointer to point to end of list
*/
head_page->prev = last_page;
success = 1;
break;
}
}
rb_reset_cpu(cpu_buffer);
rb_check_pages(cpu_buffer);
out:
atomic_dec(&cpu_buffer->record_disabled);
if (success)
INIT_LIST_HEAD(pages);
/*
* If we weren't successful in adding in new pages, warn and stop
* tracing
*/
RB_WARN_ON(cpu_buffer, !success);
raw_spin_unlock_irq(&cpu_buffer->reader_lock);
/* free pages if they weren't inserted */
if (!success) {
struct buffer_page *bpage, *tmp;
list_for_each_entry_safe(bpage, tmp, &cpu_buffer->new_pages,
list) {
list_del_init(&bpage->list);
free_buffer_page(bpage);
}
}
return success;
}
static void rb_update_pages(struct ring_buffer_per_cpu *cpu_buffer)
{
if (cpu_buffer->nr_pages_to_update > 0)
rb_insert_pages(cpu_buffer, &cpu_buffer->new_pages,
cpu_buffer->nr_pages_to_update);
else
rb_remove_pages(cpu_buffer, -cpu_buffer->nr_pages_to_update);
int success;
cpu_buffer->nr_pages += cpu_buffer->nr_pages_to_update;
if (cpu_buffer->nr_pages_to_update > 0)
success = rb_insert_pages(cpu_buffer);
else
success = rb_remove_pages(cpu_buffer,
-cpu_buffer->nr_pages_to_update);
if (success)
cpu_buffer->nr_pages += cpu_buffer->nr_pages_to_update;
}
static void update_pages_handler(struct work_struct *work)
@ -3772,6 +3823,7 @@ rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->commit_page = cpu_buffer->head_page;
INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
INIT_LIST_HEAD(&cpu_buffer->new_pages);
local_set(&cpu_buffer->reader_page->write, 0);
local_set(&cpu_buffer->reader_page->entries, 0);
local_set(&cpu_buffer->reader_page->page->commit, 0);