From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757170Ab2EDB75 (ORCPT ); Thu, 3 May 2012 21:59:57 -0400 Received: from mail-qa0-f74.google.com ([209.85.216.74]:34868 "EHLO mail-qa0-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755634Ab2EDB7z (ORCPT ); Thu, 3 May 2012 21:59:55 -0400 From: Vaibhav Nagarnaik To: Steven Rostedt , Frederic Weisbecker , Ingo Molnar Cc: Laurent Chavey , Justin Teravest , David Sharp , linux-kernel@vger.kernel.org, Vaibhav Nagarnaik Subject: [PATCH v7 2/3] trace: Make addition of pages in ring buffer atomic Date: Thu, 3 May 2012 18:59:51 -0700 Message-Id: <1336096792-25373-2-git-send-email-vnagarnaik@google.com> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1336096792-25373-1-git-send-email-vnagarnaik@google.com> References: <1335388704-26790-1-git-send-email-vnagarnaik@google.com> <1336096792-25373-1-git-send-email-vnagarnaik@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Signed-off-by: Vaibhav Nagarnaik --- kernel/trace/ring_buffer.c | 102 +++++++++++++++++++++++++++++++++----------- 1 files changed, 77 insertions(+), 25 deletions(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 230ae9d..a084b4c 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -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) { + int success; + if (cpu_buffer->nr_pages_to_update > 0) - rb_insert_pages(cpu_buffer, &cpu_buffer->new_pages, - cpu_buffer->nr_pages_to_update); + success = rb_insert_pages(cpu_buffer); else - rb_remove_pages(cpu_buffer, -cpu_buffer->nr_pages_to_update); + success = rb_remove_pages(cpu_buffer, + -cpu_buffer->nr_pages_to_update); - cpu_buffer->nr_pages += 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); -- 1.7.7.3