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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 02/40] rcu: Move rcu_gp_slow() to ->gp_seq Date: Mon, 25 Jun 2018 17:08:21 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180626000841.GA15696@linux.vnet.ibm.com> References: <20180626000841.GA15696@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18062600-2213-0000-0000-000002BFDEBF X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009255; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01052327; UDB=6.00539464; IPR=6.00830253; MB=3.00021855; MTD=3.00000008; XFM=3.00000015; UTC=2018-06-26 00:07:00 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18062600-2214-0000-0000-00005A9B9531 Message-Id: <20180626000859.23572-2-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-25_11:,, 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=8.0.1-1806210000 definitions=main-1806260000 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit moves rcu_gp_slow() to ->gp_seq. This function only uses the grace-period number to modulate delay, so rcu_seq_ctr(rsp->gp_seq) gets the same effect, at least in cases where the delay is to happen more than four times per wrap of an unsigned long. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c50bb88dcab0..90346ffd721f 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1879,7 +1879,8 @@ static void note_gp_changes(struct rcu_state *rsp, struct rcu_data *rdp) static void rcu_gp_slow(struct rcu_state *rsp, int delay) { if (delay > 0 && - !(rsp->gpnum % (rcu_num_nodes * PER_RCU_NODE_PERIOD * delay))) + !(rcu_seq_ctr(rsp->gp_seq) % + (rcu_num_nodes * PER_RCU_NODE_PERIOD * delay))) schedule_timeout_uninterruptible(delay); } -- 2.17.1