Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757551Ab2EUJpH (ORCPT ); Mon, 21 May 2012 05:45:07 -0400 Received: from terminus.zytor.com ([198.137.202.10]:39041 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756966Ab2EUJpF (ORCPT ); Mon, 21 May 2012 05:45:05 -0400 Date: Mon, 21 May 2012 02:44:52 -0700 From: tip-bot for Vaibhav Nagarnaik Message-ID: Cc: linux-kernel@vger.kernel.org, vnagarnaik@google.com, hpa@zytor.com, mingo@kernel.org, dhsharp@google.com, rostedt@goodmis.org, chavey@google.com, tglx@linutronix.de, teravest@google.com Reply-To: mingo@kernel.org, hpa@zytor.com, vnagarnaik@google.com, linux-kernel@vger.kernel.org, rostedt@goodmis.org, chavey@google.com, dhsharp@google.com, tglx@linutronix.de, teravest@google.com In-Reply-To: <1337372991-14783-1-git-send-email-vnagarnaik@google.com> References: <1337372991-14783-1-git-send-email-vnagarnaik@google.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] ring-buffer: Merge separate resize loops Git-Commit-ID: 05fdd70d2fe1e34d8b80ec56d6e3272d9293653e X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.6 (terminus.zytor.com [127.0.0.1]); Mon, 21 May 2012 02:44:58 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4521 Lines: 128 Commit-ID: 05fdd70d2fe1e34d8b80ec56d6e3272d9293653e Gitweb: http://git.kernel.org/tip/05fdd70d2fe1e34d8b80ec56d6e3272d9293653e Author: Vaibhav Nagarnaik AuthorDate: Fri, 18 May 2012 13:29:51 -0700 Committer: Steven Rostedt CommitDate: Sat, 19 May 2012 08:28:50 -0400 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 Cc: Justin Teravest Cc: David Sharp Signed-off-by: Vaibhav Nagarnaik Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer.c | 41 +++++++++++++++-------------------------- 1 files changed, 15 insertions(+), 26 deletions(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 68388f8..6420cda 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -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: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/