Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755441AbdDLRmK (ORCPT ); Wed, 12 Apr 2017 13:42:10 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:50008 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755093AbdDLRkj (ORCPT ); Wed, 12 Apr 2017 13:40:39 -0400 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 38/40] srcutorture: Print Tiny SRCU reader statistics Date: Wed, 12 Apr 2017 10:40:23 -0700 X-Mailer: git-send-email 2.5.2 In-Reply-To: <20170412174003.GA23207@linux.vnet.ibm.com> References: <20170412174003.GA23207@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17041217-0048-0000-0000-000001584475 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006924; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00846603; UDB=6.00417608; IPR=6.00625041; BA=6.00005286; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015023; XFM=3.00000013; UTC=2017-04-12 17:40:34 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17041217-0049-0000-0000-000040721FDB Message-Id: <1492018825-25634-38-git-send-email-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-04-12_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704120145 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1358 Lines: 45 The srcu_torture_stats() function is adapted to the specific srcu_struct layout traditionally used by SRCU. This commit therefore adds support for Tiny SRCU. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 98591e16db1a..9cbb8a7b909d 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -559,11 +559,12 @@ static void srcu_torture_barrier(void) static void srcu_torture_stats(void) { -#ifdef CONFIG_TREE_SRCU - int cpu; - int idx = srcu_ctlp->completed & 0x1; + int __maybe_unused cpu; + int idx; - pr_alert("%s%s per-CPU(idx=%d):", +#ifdef CONFIG_TREE_SRCU + idx = srcu_ctlp->completed & 0x1; + pr_alert("%s%s Tree SRCU per-CPU(idx=%d):", torture_type, TORTURE_FLAG, idx); for_each_possible_cpu(cpu) { unsigned long l0, l1; @@ -588,6 +589,12 @@ static void srcu_torture_stats(void) pr_cont(" %d(%ld,%ld)", cpu, c0, c1); } pr_cont("\n"); +#elif defined(CONFIG_TINY_SRCU) + idx = READ_ONCE(srcu_ctlp->srcu_idx) & 0x1; + pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%d,%d)\n", + torture_type, TORTURE_FLAG, idx, + READ_ONCE(srcu_ctlp->srcu_lock_nesting[!idx]), + READ_ONCE(srcu_ctlp->srcu_lock_nesting[idx])); #endif } -- 2.5.2