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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 03/10] rcu: Switch ->tick_nohz_enabled_snap to rcu_data structure Date: Wed, 29 Aug 2018 16:07:28 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180829230715.GA9431@linux.vnet.ibm.com> References: <20180829230715.GA9431@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082923-0060-0000-0000-000002A66613 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009636; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01080754; UDB=6.00557503; IPR=6.00860739; MB=3.00023002; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-29 23:07:42 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082923-0061-0000-0000-00004655C51B Message-Id: <20180829230735.10256-3-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-1808290225 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit removes ->tick_nohz_enabled_snap from the rcu_dynticks structure and updates the code to access it from the rcu_data structure. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.h | 1 - kernel/rcu/tree_plugin.h | 10 +++++----- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index d35cd9677b08..5d447ceba769 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -53,7 +53,6 @@ struct rcu_dynticks { /* Last jiffy CBs were accelerated. */ unsigned long last_advance_all; /* Last jiffy CBs were all advanced. */ - int tick_nohz_enabled_snap; /* Previously seen value from sysfs. */ #endif /* #ifdef CONFIG_RCU_FAST_NO_HZ */ }; diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 978ce3539809..6511032371c1 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1681,7 +1681,7 @@ int rcu_needs_cpu(u64 basemono, u64 *nextevt) static void rcu_prepare_for_idle(void) { bool needwake; - struct rcu_data *rdp; + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); struct rcu_node *rnp; int tne; @@ -1692,10 +1692,10 @@ static void rcu_prepare_for_idle(void) /* Handle nohz enablement switches conservatively. */ tne = READ_ONCE(tick_nohz_active); - if (tne != rdtp->tick_nohz_enabled_snap) { + if (tne != rdp->tick_nohz_enabled_snap) { if (rcu_cpu_has_callbacks(NULL)) invoke_rcu_core(); /* force nohz to see update. */ - rdtp->tick_nohz_enabled_snap = tne; + rdp->tick_nohz_enabled_snap = tne; return; } if (!tne) @@ -1721,7 +1721,6 @@ static void rcu_prepare_for_idle(void) if (rdtp->last_accelerate == jiffies) return; rdtp->last_accelerate = jiffies; - rdp = this_cpu_ptr(&rcu_data); if (rcu_segcblist_pend_cbs(&rdp->cblist)) { rnp = rdp->mynode; raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */ @@ -1765,6 +1764,7 @@ static void rcu_idle_count_callbacks_posted(void) static void print_cpu_stall_fast_no_hz(char *cp, int cpu) { + struct rcu_data *rdp = &per_cpu(rcu_data, cpu); struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu); unsigned long nlpd = rdtp->nonlazy_posted - rdtp->nonlazy_posted_snap; @@ -1772,7 +1772,7 @@ static void print_cpu_stall_fast_no_hz(char *cp, int cpu) rdtp->last_accelerate & 0xffff, jiffies & 0xffff, ulong2long(nlpd), rdtp->all_lazy ? 'L' : '.', - rdtp->tick_nohz_enabled_snap ? '.' : 'D'); + rdp->tick_nohz_enabled_snap ? '.' : 'D'); } #else /* #ifdef CONFIG_RCU_FAST_NO_HZ */ -- 2.17.1