From owner-svn-src-head@FreeBSD.ORG Tue Dec 10 20:06:42 2013 Return-Path: Delivered-To: svn-src-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 203C9813; Tue, 10 Dec 2013 20:06:42 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id E76E61B44; Tue, 10 Dec 2013 20:06:41 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.7/8.14.7) with ESMTP id rBAK6foI097747; Tue, 10 Dec 2013 20:06:41 GMT (envelope-from trociny@svn.freebsd.org) Received: (from trociny@localhost) by svn.freebsd.org (8.14.7/8.14.7/Submit) id rBAK6fZM097744; Tue, 10 Dec 2013 20:06:41 GMT (envelope-from trociny@svn.freebsd.org) Message-Id: <201312102006.rBAK6fZM097744@svn.freebsd.org> From: Mikolaj Golub Date: Tue, 10 Dec 2013 20:06:41 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r259195 - head/sbin/hastd X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Dec 2013 20:06:42 -0000 Author: trociny Date: Tue Dec 10 20:06:41 2013 New Revision: 259195 URL: http://svnweb.freebsd.org/changeset/base/259195 Log: Send wakeup to threads waiting on empty queue before releasing the lock to decrease spurious wakeups. Submitted by: davidxu MFC after: 2 weeks Modified: head/sbin/hastd/primary.c head/sbin/hastd/secondary.c Modified: head/sbin/hastd/primary.c ============================================================================== --- head/sbin/hastd/primary.c Tue Dec 10 20:05:07 2013 (r259194) +++ head/sbin/hastd/primary.c Tue Dec 10 20:06:41 2013 (r259195) @@ -180,27 +180,21 @@ static pthread_mutex_t metadata_lock; ((res)->hr_remotein != NULL && (res)->hr_remoteout != NULL) #define QUEUE_INSERT1(hio, name, ncomp) do { \ - bool _wakeup; \ - \ mtx_lock(&hio_##name##_list_lock[(ncomp)]); \ - _wakeup = TAILQ_EMPTY(&hio_##name##_list[(ncomp)]); \ + if (TAILQ_EMPTY(&hio_##name##_list[(ncomp)])) \ + cv_broadcast(&hio_##name##_list_cond[(ncomp)]); \ TAILQ_INSERT_TAIL(&hio_##name##_list[(ncomp)], (hio), \ hio_next[(ncomp)]); \ hio_##name##_list_size[(ncomp)]++; \ - mtx_unlock(&hio_##name##_list_lock[ncomp]); \ - if (_wakeup) \ - cv_broadcast(&hio_##name##_list_cond[(ncomp)]); \ + mtx_unlock(&hio_##name##_list_lock[(ncomp)]); \ } while (0) #define QUEUE_INSERT2(hio, name) do { \ - bool _wakeup; \ - \ mtx_lock(&hio_##name##_list_lock); \ - _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ + if (TAILQ_EMPTY(&hio_##name##_list)) \ + cv_broadcast(&hio_##name##_list_cond); \ TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_##name##_next);\ hio_##name##_list_size++; \ mtx_unlock(&hio_##name##_list_lock); \ - if (_wakeup) \ - cv_broadcast(&hio_##name##_list_cond); \ } while (0) #define QUEUE_TAKE1(hio, name, ncomp, timeout) do { \ bool _last; \ Modified: head/sbin/hastd/secondary.c ============================================================================== --- head/sbin/hastd/secondary.c Tue Dec 10 20:05:07 2013 (r259194) +++ head/sbin/hastd/secondary.c Tue Dec 10 20:06:41 2013 (r259195) @@ -110,15 +110,12 @@ static void *disk_thread(void *arg); static void *send_thread(void *arg); #define QUEUE_INSERT(name, hio) do { \ - bool _wakeup; \ - \ mtx_lock(&hio_##name##_list_lock); \ - _wakeup = TAILQ_EMPTY(&hio_##name##_list); \ + if (TAILQ_EMPTY(&hio_##name##_list)) \ + cv_broadcast(&hio_##name##_list_cond); \ TAILQ_INSERT_TAIL(&hio_##name##_list, (hio), hio_next); \ hio_##name##_list_size++; \ mtx_unlock(&hio_##name##_list_lock); \ - if (_wakeup) \ - cv_broadcast(&hio_##name##_list_cond); \ } while (0) #define QUEUE_TAKE(name, hio) do { \ mtx_lock(&hio_##name##_list_lock); \