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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, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 09/17] rcutorture: Vary forward-progress test interval Date: Wed, 29 Aug 2018 14:47:42 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180829214722.GA23411@linux.vnet.ibm.com> References: <20180829214722.GA23411@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082921-2213-0000-0000-000002E504A7 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009636; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01080727; UDB=6.00557487; IPR=6.00860712; MB=3.00023001; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-29 21:47:56 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082921-2214-0000-0000-00005B60154F Message-Id: <20180829214750.26972-9-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-29_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808290211 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some of the Linux kernel's RCU implementations provide several mechanisms to promote forward progress that operate over different timeframes. This commit therefore causes rcu_torture_fwd_prog() to vary the duration of its forward-progress testing in order to test each such mechanism. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 8ab23143c244..89cc4d9c9a0c 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -1676,16 +1676,21 @@ static int rcu_torture_fwd_prog(void *args) unsigned long cver; unsigned long gps; int idx; + int sd; + int sd4; unsigned long stopat; bool tested = false; int tested_tries = 0; + static DEFINE_TORTURE_RANDOM(trs); VERBOSE_TOROUT_STRING("rcu_torture_fwd_progress task started"); do { schedule_timeout_interruptible(fwd_progress_holdoff * HZ); cver = READ_ONCE(rcu_torture_current_version); gps = cur_ops->get_gp_seq(); - stopat = jiffies + cur_ops->stall_dur() / fwd_progress_div; + sd = cur_ops->stall_dur() + 1; + sd4 = (sd + fwd_progress_div - 1) / fwd_progress_div; + stopat = jiffies + sd4 + torture_random(&trs) % (sd - sd4); while (time_before(jiffies, stopat) && !torture_must_stop()) { idx = cur_ops->readlock(); udelay(10); -- 2.17.1