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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 08/10] rcu: Switch ->dynticks to rcu_data structure, remove rcu_dynticks Date: Wed, 29 Aug 2018 16:07:33 -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: 18082923-2213-0000-0000-000002E50ACD 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: 18082923-2214-0000-0000-00005B603BD4 Message-Id: <20180829230735.10256-8-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 move ->dynticks from the rcu_dynticks structure to the rcu_data structure, replacing the field of the same name. It also updates the code to access ->dynticks from the rcu_data structure and to use the rcu_data structure rather than following to now-gone ->dynticks field to the now-gone rcu_dynticks structure. While in the area, this commit also fixes up comments. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 92 ++++++++++++++++++---------------------- kernel/rcu/tree.h | 35 ++++++--------- kernel/rcu/tree_exp.h | 6 +-- kernel/rcu/tree_plugin.h | 3 +- 4 files changed, 56 insertions(+), 80 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 35326d1005eb..ad09707d99ee 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -73,9 +73,20 @@ /* Data structures. */ +/* + * Steal a bit from the bottom of ->dynticks for idle entry/exit + * control. Initially this is for TLB flushing. + */ +#define RCU_DYNTICK_CTRL_MASK 0x1 +#define RCU_DYNTICK_CTRL_CTR (RCU_DYNTICK_CTRL_MASK + 1) +#ifndef rcu_eqs_special_exit +#define rcu_eqs_special_exit() do { } while (0) +#endif + static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data) = { .dynticks_nesting = 1, .dynticks_nmi_nesting = DYNTICK_IRQ_NONIDLE, + .dynticks = ATOMIC_INIT(RCU_DYNTICK_CTRL_CTR), }; struct rcu_state rcu_state = { .level = { &rcu_state.node[0] }, @@ -202,27 +213,13 @@ void rcu_softirq_qs(void) rcu_preempt_deferred_qs(current); } -/* - * Steal a bit from the bottom of ->dynticks for idle entry/exit - * control. Initially this is for TLB flushing. - */ -#define RCU_DYNTICK_CTRL_MASK 0x1 -#define RCU_DYNTICK_CTRL_CTR (RCU_DYNTICK_CTRL_MASK + 1) -#ifndef rcu_eqs_special_exit -#define rcu_eqs_special_exit() do { } while (0) -#endif - -static DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = { - .dynticks = ATOMIC_INIT(RCU_DYNTICK_CTRL_CTR), -}; - /* * Record entry into an extended quiescent state. This is only to be * called when not already in an extended quiescent state. */ static void rcu_dynticks_eqs_enter(void) { - struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); int seq; /* @@ -230,7 +227,7 @@ static void rcu_dynticks_eqs_enter(void) * critical sections, and we also must force ordering with the * next idle sojourn. */ - seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks); + seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks); /* Better be in an extended quiescent state! */ WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && (seq & RCU_DYNTICK_CTRL_CTR)); @@ -245,7 +242,7 @@ static void rcu_dynticks_eqs_enter(void) */ static void rcu_dynticks_eqs_exit(void) { - struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); int seq; /* @@ -253,11 +250,11 @@ static void rcu_dynticks_eqs_exit(void) * and we also must force ordering with the next RCU read-side * critical section. */ - seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks); + seq = atomic_add_return(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !(seq & RCU_DYNTICK_CTRL_CTR)); if (seq & RCU_DYNTICK_CTRL_MASK) { - atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdtp->dynticks); + atomic_andnot(RCU_DYNTICK_CTRL_MASK, &rdp->dynticks); smp_mb__after_atomic(); /* _exit after clearing mask. */ /* Prefer duplicate flushes to losing a flush. */ rcu_eqs_special_exit(); @@ -276,11 +273,11 @@ static void rcu_dynticks_eqs_exit(void) */ static void rcu_dynticks_eqs_online(void) { - struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); - if (atomic_read(&rdtp->dynticks) & RCU_DYNTICK_CTRL_CTR) + if (atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR) return; - atomic_add(RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks); + atomic_add(RCU_DYNTICK_CTRL_CTR, &rdp->dynticks); } /* @@ -290,18 +287,18 @@ static void rcu_dynticks_eqs_online(void) */ bool rcu_dynticks_curr_cpu_in_eqs(void) { - struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); + struct rcu_data *rdp = this_cpu_ptr(&rcu_data); - return !(atomic_read(&rdtp->dynticks) & RCU_DYNTICK_CTRL_CTR); + return !(atomic_read(&rdp->dynticks) & RCU_DYNTICK_CTRL_CTR); } /* * Snapshot the ->dynticks counter with full ordering so as to allow * stable comparison of this counter with past and future snapshots. */ -int rcu_dynticks_snap(struct rcu_dynticks *rdtp) +int rcu_dynticks_snap(struct rcu_data *rdp) { - int snap = atomic_add_return(0, &rdtp->dynticks); + int snap = atomic_add_return(0, &rdp->dynticks); return snap & ~RCU_DYNTICK_CTRL_MASK; } @@ -316,13 +313,13 @@ static bool rcu_dynticks_in_eqs(int snap) } /* - * Return true if the CPU corresponding to the specified rcu_dynticks + * Return true if the CPU corresponding to the specified rcu_data * structure has spent some time in an extended quiescent state since * rcu_dynticks_snap() returned the specified snapshot. */ -static bool rcu_dynticks_in_eqs_since(struct rcu_dynticks *rdtp, int snap) +static bool rcu_dynticks_in_eqs_since(struct rcu_data *rdp, int snap) { - return snap != rcu_dynticks_snap(rdtp); + return snap != rcu_dynticks_snap(rdp); } /* @@ -336,14 +333,14 @@ bool rcu_eqs_special_set(int cpu) { int old; int new; - struct rcu_dynticks *rdtp = &per_cpu(rcu_dynticks, cpu); + struct rcu_data *rdp = &per_cpu(rcu_data, cpu); do { - old = atomic_read(&rdtp->dynticks); + old = atomic_read(&rdp->dynticks); if (old & RCU_DYNTICK_CTRL_CTR) return false; new = old | RCU_DYNTICK_CTRL_MASK; - } while (atomic_cmpxchg(&rdtp->dynticks, old, new) != old); + } while (atomic_cmpxchg(&rdp->dynticks, old, new) != old); return true; } @@ -360,11 +357,11 @@ bool rcu_eqs_special_set(int cpu) */ static void __maybe_unused rcu_momentary_dyntick_idle(void) { - struct rcu_dynticks *rdtp = this_cpu_ptr(&rcu_dynticks); int special; raw_cpu_write(rcu_data.rcu_need_heavy_qs, false); - special = atomic_add_return(2 * RCU_DYNTICK_CTRL_CTR, &rdtp->dynticks); + special = atomic_add_return(2 * RCU_DYNTICK_CTRL_CTR, + &this_cpu_ptr(&rcu_data)->dynticks); /* It is illegal to call this from idle state. */ WARN_ON_ONCE(!(special & RCU_DYNTICK_CTRL_CTR)); rcu_preempt_deferred_qs(current); @@ -573,9 +570,7 @@ static struct rcu_node *rcu_get_root(void) static void rcu_eqs_enter(bool user) { struct rcu_data *rdp = this_cpu_ptr(&rcu_data); - struct rcu_dynticks *rdtp; - rdtp = this_cpu_ptr(&rcu_dynticks); WARN_ON_ONCE(rdp->dynticks_nmi_nesting != DYNTICK_IRQ_NONIDLE); WRITE_ONCE(rdp->dynticks_nmi_nesting, 0); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && @@ -586,7 +581,7 @@ static void rcu_eqs_enter(bool user) } lockdep_assert_irqs_disabled(); - trace_rcu_dyntick(TPS("Start"), rdp->dynticks_nesting, 0, rdtp->dynticks); + trace_rcu_dyntick(TPS("Start"), rdp->dynticks_nesting, 0, rdp->dynticks); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current)); rdp = this_cpu_ptr(&rcu_data); do_nocb_deferred_wakeup(rdp); @@ -638,7 +633,7 @@ void rcu_user_enter(void) * @irq: Is this call from rcu_irq_exit? * * If we are returning from the outermost NMI handler that interrupted an - * RCU-idle period, update rdtp->dynticks and rdp->dynticks_nmi_nesting + * RCU-idle period, update rdp->dynticks and rdp->dynticks_nmi_nesting * to let the RCU grace-period handling know that the CPU is back to * being RCU-idle. * @@ -648,7 +643,6 @@ void rcu_user_enter(void) static __always_inline void rcu_nmi_exit_common(bool irq) { struct rcu_data *rdp = this_cpu_ptr(&rcu_data); - struct rcu_dynticks __maybe_unused *rdtp = this_cpu_ptr(&rcu_dynticks); /* * Check for ->dynticks_nmi_nesting underflow and bad ->dynticks. @@ -663,14 +657,14 @@ static __always_inline void rcu_nmi_exit_common(bool irq) * leave it in non-RCU-idle state. */ if (rdp->dynticks_nmi_nesting != 1) { - trace_rcu_dyntick(TPS("--="), rdp->dynticks_nmi_nesting, rdp->dynticks_nmi_nesting - 2, rdtp->dynticks); + trace_rcu_dyntick(TPS("--="), rdp->dynticks_nmi_nesting, rdp->dynticks_nmi_nesting - 2, rdp->dynticks); WRITE_ONCE(rdp->dynticks_nmi_nesting, /* No store tearing. */ rdp->dynticks_nmi_nesting - 2); return; } /* This NMI interrupted an RCU-idle CPU, restore RCU-idleness. */ - trace_rcu_dyntick(TPS("Startirq"), rdp->dynticks_nmi_nesting, 0, rdtp->dynticks); + trace_rcu_dyntick(TPS("Startirq"), rdp->dynticks_nmi_nesting, 0, rdp->dynticks); WRITE_ONCE(rdp->dynticks_nmi_nesting, 0); /* Avoid store tearing. */ if (irq) @@ -741,11 +735,9 @@ void rcu_irq_exit_irqson(void) static void rcu_eqs_exit(bool user) { struct rcu_data *rdp; - struct rcu_dynticks *rdtp; long oldval; lockdep_assert_irqs_disabled(); - rdtp = this_cpu_ptr(&rcu_dynticks); rdp = this_cpu_ptr(&rcu_data); oldval = rdp->dynticks_nesting; WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && oldval < 0); @@ -756,7 +748,7 @@ static void rcu_eqs_exit(bool user) rcu_dynticks_task_exit(); rcu_dynticks_eqs_exit(); rcu_cleanup_after_idle(); - trace_rcu_dyntick(TPS("End"), rdp->dynticks_nesting, 1, rdtp->dynticks); + trace_rcu_dyntick(TPS("End"), rdp->dynticks_nesting, 1, rdp->dynticks); WARN_ON_ONCE(IS_ENABLED(CONFIG_RCU_EQS_DEBUG) && !user && !is_idle_task(current)); WRITE_ONCE(rdp->dynticks_nesting, 1); WARN_ON_ONCE(rdp->dynticks_nmi_nesting); @@ -801,7 +793,7 @@ void rcu_user_exit(void) * rcu_nmi_enter_common - inform RCU of entry to NMI context * @irq: Is this call from rcu_irq_enter? * - * If the CPU was idle from RCU's viewpoint, update rdtp->dynticks and + * If the CPU was idle from RCU's viewpoint, update rdp->dynticks and * rdp->dynticks_nmi_nesting to let the RCU grace-period handling know * that the CPU is active. This implementation permits nested NMIs, as * long as the nesting level does not overflow an int. (You will probably @@ -813,7 +805,6 @@ void rcu_user_exit(void) static __always_inline void rcu_nmi_enter_common(bool irq) { struct rcu_data *rdp = this_cpu_ptr(&rcu_data); - struct rcu_dynticks __maybe_unused *rdtp = this_cpu_ptr(&rcu_dynticks); long incby = 2; /* Complain about underflow. */ @@ -841,7 +832,7 @@ static __always_inline void rcu_nmi_enter_common(bool irq) } trace_rcu_dyntick(incby == 1 ? TPS("Endirq") : TPS("++="), rdp->dynticks_nmi_nesting, - rdp->dynticks_nmi_nesting + incby, rdtp->dynticks); + rdp->dynticks_nmi_nesting + incby, rdp->dynticks); WRITE_ONCE(rdp->dynticks_nmi_nesting, /* Prevent store tearing. */ rdp->dynticks_nmi_nesting + incby); barrier(); @@ -994,7 +985,7 @@ static void rcu_gpnum_ovf(struct rcu_node *rnp, struct rcu_data *rdp) */ static int dyntick_save_progress_counter(struct rcu_data *rdp) { - rdp->dynticks_snap = rcu_dynticks_snap(rdp->dynticks); + rdp->dynticks_snap = rcu_dynticks_snap(rdp); if (rcu_dynticks_in_eqs(rdp->dynticks_snap)) { trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti")); rcu_gpnum_ovf(rdp->mynode, rdp); @@ -1045,7 +1036,7 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp) * read-side critical section that started before the beginning * of the current RCU grace period. */ - if (rcu_dynticks_in_eqs_since(rdp->dynticks, rdp->dynticks_snap)) { + if (rcu_dynticks_in_eqs_since(rdp, rdp->dynticks_snap)) { trace_rcu_fqs(rcu_state.name, rdp->gp_seq, rdp->cpu, TPS("dti")); rdp->dynticks_fqs++; rcu_gpnum_ovf(rnp, rdp); @@ -3197,9 +3188,8 @@ rcu_boot_init_percpu_data(int cpu) /* Set up local state, ensuring consistent view of global state. */ rdp->grpmask = leaf_node_cpu_bit(rdp->mynode, cpu); - rdp->dynticks = &per_cpu(rcu_dynticks, cpu); WARN_ON_ONCE(rdp->dynticks_nesting != 1); - WARN_ON_ONCE(rcu_dynticks_in_eqs(rcu_dynticks_snap(rdp->dynticks))); + WARN_ON_ONCE(rcu_dynticks_in_eqs(rcu_dynticks_snap(rdp))); rdp->rcu_ofl_gp_seq = rcu_state.gp_seq; rdp->rcu_ofl_gp_flags = RCU_GP_CLEANED; rdp->rcu_onl_gp_seq = rcu_state.gp_seq; diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 2e5eec48a94a..af8681fec23b 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -34,13 +34,6 @@ #include "rcu_segcblist.h" -/* - * Dynticks per-CPU state. - */ -struct rcu_dynticks { - atomic_t dynticks; /* Even value for idle, else odd. */ -}; - /* Communicate arguments to a workqueue handler. */ struct rcu_exp_work { smp_call_func_t rew_func; @@ -194,24 +187,20 @@ struct rcu_data { long blimit; /* Upper limit on a processed batch */ /* 3) dynticks interface. */ - struct rcu_dynticks *dynticks; /* Shared per-CPU dynticks state. */ int dynticks_snap; /* Per-GP tracking for dynticks. */ - long dynticks_nesting; /* Track process nesting level. */ - long dynticks_nmi_nesting; /* Track irq/NMI nesting level. */ - // atomic_t dynticks; /* Even value for idle, else odd. */ - bool rcu_need_heavy_qs; /* GP old, need heavy quiescent state. */ - bool rcu_urgent_qs; /* GP old need light quiescent state. */ + long dynticks_nesting; /* Track process nesting level. */ + long dynticks_nmi_nesting; /* Track irq/NMI nesting level. */ + atomic_t dynticks; /* Even value for idle, else odd. */ + bool rcu_need_heavy_qs; /* GP old, so heavy quiescent state! */ + bool rcu_urgent_qs; /* GP old need light quiescent state. */ #ifdef CONFIG_RCU_FAST_NO_HZ - bool all_lazy; /* Are all CPU's CBs lazy? */ - unsigned long nonlazy_posted; - /* # times non-lazy CBs posted to CPU. */ + bool all_lazy; /* Are all CPU's CBs lazy? */ + unsigned long nonlazy_posted; /* # times non-lazy CB posted to CPU. */ unsigned long nonlazy_posted_snap; - /* idle-period nonlazy_posted snapshot. */ - unsigned long last_accelerate; - /* 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. */ + /* Nonlazy_posted snapshot. */ + unsigned long last_accelerate; /* 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 */ /* 4) reasons this CPU needed to be kicked by force_quiescent_state */ @@ -426,7 +415,7 @@ extern struct rcu_state rcu_bh_state; extern struct rcu_state rcu_preempt_state; #endif /* #ifdef CONFIG_PREEMPT_RCU */ -int rcu_dynticks_snap(struct rcu_dynticks *rdtp); +int rcu_dynticks_snap(struct rcu_data *rdp); #ifdef CONFIG_RCU_BOOST DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status); diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 11387fcd4d85..8d18c1014e2b 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -360,14 +360,13 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp) for_each_leaf_node_cpu_mask(rnp, cpu, rnp->expmask) { unsigned long mask = leaf_node_cpu_bit(rnp, cpu); struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); - struct rcu_dynticks *rdtp = per_cpu_ptr(&rcu_dynticks, cpu); int snap; if (raw_smp_processor_id() == cpu || !(rnp->qsmaskinitnext & mask)) { mask_ofl_test |= mask; } else { - snap = rcu_dynticks_snap(rdtp); + snap = rcu_dynticks_snap(rdp); if (rcu_dynticks_in_eqs(snap)) mask_ofl_test |= mask; else @@ -393,8 +392,7 @@ static void sync_rcu_exp_select_node_cpus(struct work_struct *wp) if (!(mask_ofl_ipi & mask)) continue; retry_ipi: - if (rcu_dynticks_in_eqs_since(rdp->dynticks, - rdp->exp_dynticks_snap)) { + if (rcu_dynticks_in_eqs_since(rdp, rdp->exp_dynticks_snap)) { mask_ofl_test |= mask; continue; } diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 7087ee3e1ea5..05915e536336 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1802,7 +1802,6 @@ static void print_cpu_stall_info(int cpu) unsigned long delta; char fast_no_hz[72]; struct rcu_data *rdp = per_cpu_ptr(&rcu_data, cpu); - struct rcu_dynticks *rdtp = rdp->dynticks; char *ticks_title; unsigned long ticks_value; @@ -1830,7 +1829,7 @@ static void print_cpu_stall_info(int cpu) rdp->rcu_iw_pending ? (int)min(delta, 9UL) + '0' : "!."[!delta], ticks_value, ticks_title, - rcu_dynticks_snap(rdtp) & 0xfff, + rcu_dynticks_snap(rdp) & 0xfff, rdp->dynticks_nesting, rdp->dynticks_nmi_nesting, rdp->softirq_snap, kstat_softirqs_cpu(RCU_SOFTIRQ, cpu), READ_ONCE(rcu_state.n_force_qs) - rcu_state.n_force_qs_gpstart, -- 2.17.1