Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751244AbWHUWZl (ORCPT ); Mon, 21 Aug 2006 18:25:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751249AbWHUWZl (ORCPT ); Mon, 21 Aug 2006 18:25:41 -0400 Received: from e35.co.us.ibm.com ([32.97.110.153]:24969 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S1751244AbWHUWZk (ORCPT ); Mon, 21 Aug 2006 18:25:40 -0400 Subject: [PATCH v2] RCU: add fake writers to rcutorture From: Josh Triplett To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Paul McKenney , Dipkanar Sarma , Adrian Bunk Content-Type: text/plain Date: Mon, 21 Aug 2006 15:25:42 -0700 Message-Id: <1156199142.4267.10.camel@josh-work.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.6.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9302 Lines: 274 rcutorture currently has one writer and an arbitrary number of readers. To better exercise some of the code paths in RCU, add fake writer threads which call the synchronize function for the RCU variant in a loop, with a delay between calls to arrange for different numbers of writers running in parallel. Signed-off-by: Josh Triplett --- This revised patch incorporates Adrian Bunk's suggestion to make rcu_bh_torture_synchronize() static, and adds the previously missing Signed-Off-By noticed by Andrew Morton. Please replace the -mm patch "rcu-add-fake-writers-to-rcutorture.patch" with this one. I've tested rcutorture with this patch against classic RCU, the _bh variant, and SRCU. In the SRCU case, I used a systemtap script to confirm that the fakewriters do trigger the early return case in synchronize_srcu(). Documentation/RCU/torture.txt | 9 +++ kernel/rcutorture.c | 109 +++++++++++++++++++++++++++++++++++++++-- 2 files changed, 113 insertions(+), 5 deletions(-) diff --git a/Documentation/RCU/torture.txt b/Documentation/RCU/torture.txt index 2174bad..2180ef9 100644 --- a/Documentation/RCU/torture.txt +++ b/Documentation/RCU/torture.txt @@ -28,6 +28,15 @@ nreaders This is the number of RCU readi To properly exercise RCU implementations with preemptible read-side critical sections. +nfakewriters This is the number of RCU fake writer threads to run. Fake + writer threads repeatedly use the synchronous "wait for + current readers" function of the interface selected by + torture_type, with a delay between calls to allow for various + different numbers of writers running in parallel. + nfakewriters defaults to 4, which provides enough parallelism + to trigger special cases caused by multiple writers, such as + the synchronize_srcu() early return optimization. + stat_interval The number of seconds between output of torture statistics (via printk()). Regardless of the interval, statistics are printed when the module is unloaded. diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c index 43d6d4f..e045021 100644 --- a/kernel/rcutorture.c +++ b/kernel/rcutorture.c @@ -15,9 +15,10 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * - * Copyright (C) IBM Corporation, 2005 + * Copyright (C) IBM Corporation, 2005, 2006 * * Authors: Paul E. McKenney + * Josh Triplett * * See also: Documentation/RCU/torture.txt */ @@ -47,9 +48,11 @@ #include #include MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Paul E. McKenney "); +MODULE_AUTHOR("Paul E. McKenney and " + "Josh Triplett "); static int nreaders = -1; /* # reader threads, defaults to 2*ncpus */ +static int nfakewriters = 4; /* # fake writer threads */ static int stat_interval; /* Interval between stats, in seconds. */ /* Defaults to "only at end of test". */ static int verbose; /* Print more debug info. */ @@ -59,6 +62,8 @@ static char *torture_type = "rcu"; /* Wh module_param(nreaders, int, 0); MODULE_PARM_DESC(nreaders, "Number of RCU reader threads"); +module_param(nfakewriters, int, 0); +MODULE_PARM_DESC(nfakewriters, "Number of RCU fake writer threads"); module_param(stat_interval, int, 0); MODULE_PARM_DESC(stat_interval, "Number of seconds between stats printk()s"); module_param(verbose, bool, 0); @@ -82,6 +87,7 @@ static char printk_buf[4096]; static int nrealreaders; static struct task_struct *writer_task; +static struct task_struct **fakewriter_tasks; static struct task_struct **reader_tasks; static struct task_struct *stats_task; static struct task_struct *shuffler_task; @@ -186,6 +192,7 @@ struct rcu_torture_ops { void (*readunlock)(int idx); int (*completed)(void); void (*deferredfree)(struct rcu_torture *p); + void (*sync)(void); int (*stats)(char *page); char *name; }; @@ -258,6 +265,7 @@ static struct rcu_torture_ops rcu_ops = .readunlock = rcu_torture_read_unlock, .completed = rcu_torture_completed, .deferredfree = rcu_torture_deferred_free, + .sync = synchronize_rcu, .stats = NULL, .name = "rcu" }; @@ -287,6 +295,28 @@ static void rcu_bh_torture_deferred_free call_rcu_bh(&p->rtort_rcu, rcu_torture_cb); } +struct rcu_bh_torture_synchronize { + struct rcu_head head; + struct completion completion; +}; + +static void rcu_bh_torture_wakeme_after_cb(struct rcu_head *head) +{ + struct rcu_bh_torture_synchronize *rcu; + + rcu = container_of(head, struct rcu_bh_torture_synchronize, head); + complete(&rcu->completion); +} + +static void rcu_bh_torture_synchronize(void) +{ + struct rcu_bh_torture_synchronize rcu; + + init_completion(&rcu.completion); + call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb); + wait_for_completion(&rcu.completion); +} + static struct rcu_torture_ops rcu_bh_ops = { .init = NULL, .cleanup = NULL, @@ -295,6 +325,7 @@ static struct rcu_torture_ops rcu_bh_ops .readunlock = rcu_bh_torture_read_unlock, .completed = rcu_bh_torture_completed, .deferredfree = rcu_bh_torture_deferred_free, + .sync = rcu_bh_torture_synchronize, .stats = NULL, .name = "rcu_bh" }; @@ -367,6 +398,11 @@ static void srcu_torture_deferred_free(s } } +static void srcu_torture_synchronize(void) +{ + synchronize_srcu(&srcu_ctl); +} + static int srcu_torture_stats(char *page) { int cnt = 0; @@ -392,6 +428,7 @@ static struct rcu_torture_ops srcu_ops = .readunlock = srcu_torture_read_unlock, .completed = srcu_torture_completed, .deferredfree = srcu_torture_deferred_free, + .sync = srcu_torture_synchronize, .stats = srcu_torture_stats, .name = "srcu" }; @@ -444,6 +481,30 @@ rcu_torture_writer(void *arg) } /* + * RCU torture fake writer kthread. Repeatedly calls sync, with a random + * delay between calls. + */ +static int +rcu_torture_fakewriter(void *arg) +{ + DEFINE_RCU_RANDOM(rand); + + VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started"); + set_user_nice(current, 19); + + do { + schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10); + udelay(rcu_random(&rand) & 0x3ff); + cur_ops->sync(); + } while (!kthread_should_stop() && !fullstop); + + VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task stopping"); + while (!kthread_should_stop()) + schedule_timeout_uninterruptible(1); + return 0; +} + +/* * RCU torture reader kthread. Repeatedly dereferences rcu_torture_current, * incrementing the corresponding element of the pipeline array. The * counter in the element should never be greater than 1, otherwise, the @@ -621,6 +682,12 @@ static void rcu_torture_shuffle_tasks(vo set_cpus_allowed(reader_tasks[i], tmp_mask); } + if (fakewriter_tasks != NULL) { + for (i = 0; i < nfakewriters; i++) + if (fakewriter_tasks[i]) + set_cpus_allowed(fakewriter_tasks[i], tmp_mask); + } + if (writer_task) set_cpus_allowed(writer_task, tmp_mask); @@ -654,11 +721,12 @@ rcu_torture_shuffle(void *arg) static inline void rcu_torture_print_module_parms(char *tag) { - printk(KERN_ALERT "%s" TORTURE_FLAG "--- %s: nreaders=%d " + printk(KERN_ALERT "%s" TORTURE_FLAG + "--- %s: nreaders=%d nfakewriters=%d " "stat_interval=%d verbose=%d test_no_idle_hz=%d " "shuffle_interval = %d\n", - torture_type, tag, nrealreaders, stat_interval, verbose, - test_no_idle_hz, shuffle_interval); + torture_type, tag, nrealreaders, nfakewriters, + stat_interval, verbose, test_no_idle_hz, shuffle_interval); } static void @@ -693,6 +761,19 @@ rcu_torture_cleanup(void) } rcu_torture_current = NULL; + if (fakewriter_tasks != NULL) { + for (i = 0; i < nfakewriters; i++) { + if (fakewriter_tasks[i] != NULL) { + VERBOSE_PRINTK_STRING( + "Stopping rcu_torture_fakewriter task"); + kthread_stop(fakewriter_tasks[i]); + } + fakewriter_tasks[i] = NULL; + } + kfree(fakewriter_tasks); + fakewriter_tasks = NULL; + } + if (stats_task != NULL) { VERBOSE_PRINTK_STRING("Stopping rcu_torture_stats task"); kthread_stop(stats_task); @@ -780,6 +861,24 @@ rcu_torture_init(void) writer_task = NULL; goto unwind; } + fakewriter_tasks = kzalloc(nfakewriters * sizeof(fakewriter_tasks[0]), + GFP_KERNEL); + if (fakewriter_tasks == NULL) { + VERBOSE_PRINTK_ERRSTRING("out of memory"); + firsterr = -ENOMEM; + goto unwind; + } + for (i = 0; i < nfakewriters; i++) { + VERBOSE_PRINTK_STRING("Creating rcu_torture_fakewriter task"); + fakewriter_tasks[i] = kthread_run(rcu_torture_fakewriter, NULL, + "rcu_torture_fakewriter"); + if (IS_ERR(fakewriter_tasks[i])) { + firsterr = PTR_ERR(fakewriter_tasks[i]); + VERBOSE_PRINTK_ERRSTRING("Failed to create fakewriter"); + fakewriter_tasks[i] = NULL; + goto unwind; + } + } reader_tasks = kzalloc(nrealreaders * sizeof(reader_tasks[0]), GFP_KERNEL); if (reader_tasks == NULL) { -- 1.4.1.1 - 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/