adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-28 19:56:18 +00:00
Code Issues Projects Releases Packages Wiki Activity

rcu: Renamings to increase RCU clarity

Browse source 
Make RCU-sched, RCU-bh, and RCU-preempt be underlying
implementations, with "RCU" defined in terms of one of the
three.  Update the outdated rcu_qsctr_inc() names, as these
functions no longer increment anything.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: akpm@linux-foundation.org
Cc: mathieu.desnoyers@polymtl.ca
Cc: josht@linux.vnet.ibm.com
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
LKML-Reference: <12509746132696-git-send-email->
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul E. McKenney 2009-08-22 13:56:46 -07:00 committed by Ingo Molnar
parent 9f77da9f40
commit d6714c22b4
10 changed files with 95 additions and 63 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
Documentation/RCU/trace.txt
View file

@ -191,8 +191,7 @@ rcu/rcuhier (which displays the struct rcu_node hierarchy).
The output of "cat rcu/rcudata" looks as follows: The output of "cat rcu/rcudata" looks as follows:
rcu: rcu_sched:
rcu:
0 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=10951/1 dn=0 df=1101 of=0 ri=36 ql=0 b=10 0 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=10951/1 dn=0 df=1101 of=0 ri=36 ql=0 b=10
1 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=16117/1 dn=0 df=1015 of=0 ri=0 ql=0 b=10 1 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=16117/1 dn=0 df=1015 of=0 ri=0 ql=0 b=10
2 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=1445/1 dn=0 df=1839 of=0 ri=0 ql=0 b=10 2 c=17829 g=17829 pq=1 pqc=17829 qp=0 dt=1445/1 dn=0 df=1839 of=0 ri=0 ql=0 b=10
@ -306,7 +305,7 @@ comma-separated-variable spreadsheet format.
The output of "cat rcu/rcugp" looks as follows: The output of "cat rcu/rcugp" looks as follows:
rcu: completed=33062 gpnum=33063 rcu_sched: completed=33062 gpnum=33063
rcu_bh: completed=464 gpnum=464 rcu_bh: completed=464 gpnum=464
Again, this output is for both "rcu" and "rcu_bh". The fields are Again, this output is for both "rcu" and "rcu_bh". The fields are
@ -413,7 +412,7 @@ o Each element of the form "1/1 0:127 ^0" represents one struct
The output of "cat rcu/rcu_pending" looks as follows: The output of "cat rcu/rcu_pending" looks as follows:
rcu: rcu_sched:
0 np=255892 qsp=53936 cbr=0 cng=14417 gpc=10033 gps=24320 nf=6445 nn=146741 0 np=255892 qsp=53936 cbr=0 cng=14417 gpc=10033 gps=24320 nf=6445 nn=146741
1 np=261224 qsp=54638 cbr=0 cng=25723 gpc=16310 gps=2849 nf=5912 nn=155792 1 np=261224 qsp=54638 cbr=0 cng=25723 gpc=16310 gps=2849 nf=5912 nn=155792
2 np=237496 qsp=49664 cbr=0 cng=2762 gpc=45478 gps=1762 nf=1201 nn=136629 2 np=237496 qsp=49664 cbr=0 cng=2762 gpc=45478 gps=1762 nf=1201 nn=136629

21
include/linux/rcupdate.h
View file

@ -157,17 +157,28 @@ extern int rcu_scheduler_active;
* - call_rcu_sched() and rcu_barrier_sched() * - call_rcu_sched() and rcu_barrier_sched()
* on the write-side to insure proper synchronization. * on the write-side to insure proper synchronization.
*/ */
#define rcu_read_lock_sched() preempt_disable() static inline void rcu_read_lock_sched(void)
#define rcu_read_lock_sched_notrace() preempt_disable_notrace() {
preempt_disable();
}
static inline void rcu_read_lock_sched_notrace(void)
{
preempt_disable_notrace();
}
/* /*
* rcu_read_unlock_sched - marks the end of a RCU-classic critical section * rcu_read_unlock_sched - marks the end of a RCU-classic critical section
* *
* See rcu_read_lock_sched for more information. * See rcu_read_lock_sched for more information.
*/ */
#define rcu_read_unlock_sched() preempt_enable() static inline void rcu_read_unlock_sched(void)
#define rcu_read_unlock_sched_notrace() preempt_enable_notrace() {
preempt_enable();
}
static inline void rcu_read_unlock_sched_notrace(void)
{
preempt_enable_notrace();
}
/** /**

4
include/linux/rcupreempt.h
View file

@ -40,8 +40,8 @@
#include <linux/cpumask.h> #include <linux/cpumask.h>
#include <linux/seqlock.h> #include <linux/seqlock.h>
extern void rcu_qsctr_inc(int cpu); extern void rcu_sched_qs(int cpu);
static inline void rcu_bh_qsctr_inc(int cpu) { } static inline void rcu_bh_qs(int cpu) { }
/* /*
* Someone might want to pass call_rcu_bh as a function pointer. * Someone might want to pass call_rcu_bh as a function pointer.

8
include/linux/rcutree.h
View file

@ -30,8 +30,8 @@
#ifndef __LINUX_RCUTREE_H #ifndef __LINUX_RCUTREE_H
#define __LINUX_RCUTREE_H #define __LINUX_RCUTREE_H
extern void rcu_qsctr_inc(int cpu); extern void rcu_sched_qs(int cpu);
extern void rcu_bh_qsctr_inc(int cpu); extern void rcu_bh_qs(int cpu);
extern int rcu_pending(int cpu); extern int rcu_pending(int cpu);
extern int rcu_needs_cpu(int cpu); extern int rcu_needs_cpu(int cpu);
@ -73,7 +73,8 @@ static inline void __rcu_read_unlock_bh(void)
#define __synchronize_sched() synchronize_rcu() #define __synchronize_sched() synchronize_rcu()
#define call_rcu_sched(head, func) call_rcu(head, func) extern void call_rcu_sched(struct rcu_head *head,
void (*func)(struct rcu_head *rcu));
static inline void synchronize_rcu_expedited(void) static inline void synchronize_rcu_expedited(void)
{ {
@ -91,6 +92,7 @@ extern void rcu_restart_cpu(int cpu);
extern long rcu_batches_completed(void); extern long rcu_batches_completed(void);
extern long rcu_batches_completed_bh(void); extern long rcu_batches_completed_bh(void);
extern long rcu_batches_completed_sched(void);
static inline void rcu_init_sched(void) static inline void rcu_init_sched(void)
{ {

8
kernel/rcupreempt.c
View file

@ -159,7 +159,7 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_dyntick_sched, rcu_dyntick_sched
.dynticks = 1, .dynticks = 1,
}; };
void rcu_qsctr_inc(int cpu) void rcu_sched_qs(int cpu)
{ {
struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu); struct rcu_dyntick_sched *rdssp = &per_cpu(rcu_dyntick_sched, cpu);
@ -967,12 +967,12 @@ void rcu_check_callbacks(int cpu, int user)
* If this CPU took its interrupt from user mode or from the * If this CPU took its interrupt from user mode or from the
* idle loop, and this is not a nested interrupt, then * idle loop, and this is not a nested interrupt, then
* this CPU has to have exited all prior preept-disable * this CPU has to have exited all prior preept-disable
* sections of code. So increment the counter to note this. * sections of code. So invoke rcu_sched_qs() to note this.
* *
* The memory barrier is needed to handle the case where * The memory barrier is needed to handle the case where
* writes from a preempt-disable section of code get reordered * writes from a preempt-disable section of code get reordered
* into schedule() by this CPU's write buffer. So the memory * into schedule() by this CPU's write buffer. So the memory
* barrier makes sure that the rcu_qsctr_inc() is seen by other * barrier makes sure that the rcu_sched_qs() is seen by other
* CPUs to happen after any such write. * CPUs to happen after any such write.
*/ */
@ -980,7 +980,7 @@ void rcu_check_callbacks(int cpu, int user)
(idle_cpu(cpu) && !in_softirq() && (idle_cpu(cpu) && !in_softirq() &&
hardirq_count() <= (1 << HARDIRQ_SHIFT))) { hardirq_count() <= (1 << HARDIRQ_SHIFT))) {
smp_mb(); /* Guard against aggressive schedule(). */ smp_mb(); /* Guard against aggressive schedule(). */
rcu_qsctr_inc(cpu); rcu_sched_qs(cpu);
} }
rcu_check_mb(cpu); rcu_check_mb(cpu);

80
kernel/rcutree.c
View file

@ -74,26 +74,25 @@ EXPORT_SYMBOL_GPL(rcu_lock_map);
.n_force_qs_ngp = 0, \ .n_force_qs_ngp = 0, \
} }
struct rcu_state rcu_state = RCU_STATE_INITIALIZER(rcu_state); struct rcu_state rcu_sched_state = RCU_STATE_INITIALIZER(rcu_sched_state);
DEFINE_PER_CPU(struct rcu_data, rcu_data); DEFINE_PER_CPU(struct rcu_data, rcu_sched_data);
struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state); struct rcu_state rcu_bh_state = RCU_STATE_INITIALIZER(rcu_bh_state);
DEFINE_PER_CPU(struct rcu_data, rcu_bh_data); DEFINE_PER_CPU(struct rcu_data, rcu_bh_data);
/* /*
* Increment the quiescent state counter. * Note a quiescent state. Because we do not need to know
* The counter is a bit degenerated: We do not need to know
* how many quiescent states passed, just if there was at least * how many quiescent states passed, just if there was at least
* one since the start of the grace period. Thus just a flag. * one since the start of the grace period, this just sets a flag.
*/ */
void rcu_qsctr_inc(int cpu) void rcu_sched_qs(int cpu)
{ {
struct rcu_data *rdp = &per_cpu(rcu_data, cpu); struct rcu_data *rdp = &per_cpu(rcu_sched_data, cpu);
rdp->passed_quiesc = 1; rdp->passed_quiesc = 1;
rdp->passed_quiesc_completed = rdp->completed; rdp->passed_quiesc_completed = rdp->completed;
} }
void rcu_bh_qsctr_inc(int cpu) void rcu_bh_qs(int cpu)
{ {
struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu); struct rcu_data *rdp = &per_cpu(rcu_bh_data, cpu);
rdp->passed_quiesc = 1; rdp->passed_quiesc = 1;
@ -113,12 +112,22 @@ static int qlowmark = 100; /* Once only this many pending, use blimit. */
static void force_quiescent_state(struct rcu_state *rsp, int relaxed); static void force_quiescent_state(struct rcu_state *rsp, int relaxed);
/*
* Return the number of RCU-sched batches processed thus far for debug & stats.
*/
long rcu_batches_completed_sched(void)
{
return rcu_sched_state.completed;
}
EXPORT_SYMBOL_GPL(rcu_batches_completed_sched);
/* /*
* Return the number of RCU batches processed thus far for debug & stats. * Return the number of RCU batches processed thus far for debug & stats.
* @@@ placeholder, maps to rcu_batches_completed_sched().
*/ */
long rcu_batches_completed(void) long rcu_batches_completed(void)
{ {
return rcu_state.completed; return rcu_batches_completed_sched();
} }
EXPORT_SYMBOL_GPL(rcu_batches_completed); EXPORT_SYMBOL_GPL(rcu_batches_completed);
@ -310,7 +319,7 @@ void rcu_irq_exit(void)
WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs); WARN_ON_RATELIMIT(rdtp->dynticks & 0x1, &rcu_rs);
/* If the interrupt queued a callback, get out of dyntick mode. */ /* If the interrupt queued a callback, get out of dyntick mode. */
if (__get_cpu_var(rcu_data).nxtlist || if (__get_cpu_var(rcu_sched_data).nxtlist ||
__get_cpu_var(rcu_bh_data).nxtlist) __get_cpu_var(rcu_bh_data).nxtlist)
set_need_resched(); set_need_resched();
} }
@ -847,7 +856,7 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
/* /*
* Move callbacks from the outgoing CPU to the running CPU. * Move callbacks from the outgoing CPU to the running CPU.
* Note that the outgoing CPU is now quiscent, so it is now * Note that the outgoing CPU is now quiscent, so it is now
* (uncharacteristically) safe to access it rcu_data structure. * (uncharacteristically) safe to access its rcu_data structure.
* Note also that we must carefully retain the order of the * Note also that we must carefully retain the order of the
* outgoing CPU's callbacks in order for rcu_barrier() to work * outgoing CPU's callbacks in order for rcu_barrier() to work
* correctly. Finally, note that we start all the callbacks * correctly. Finally, note that we start all the callbacks
@ -878,7 +887,7 @@ static void __rcu_offline_cpu(int cpu, struct rcu_state *rsp)
*/ */
static void rcu_offline_cpu(int cpu) static void rcu_offline_cpu(int cpu)
{ {
__rcu_offline_cpu(cpu, &rcu_state); __rcu_offline_cpu(cpu, &rcu_sched_state);
__rcu_offline_cpu(cpu, &rcu_bh_state); __rcu_offline_cpu(cpu, &rcu_bh_state);
} }
@ -973,17 +982,16 @@ void rcu_check_callbacks(int cpu, int user)
* Get here if this CPU took its interrupt from user * Get here if this CPU took its interrupt from user
* mode or from the idle loop, and if this is not a * mode or from the idle loop, and if this is not a
* nested interrupt. In this case, the CPU is in * nested interrupt. In this case, the CPU is in
* a quiescent state, so count it. * a quiescent state, so note it.
* *
* No memory barrier is required here because both * No memory barrier is required here because both
* rcu_qsctr_inc() and rcu_bh_qsctr_inc() reference * rcu_sched_qs() and rcu_bh_qs() reference only CPU-local
* only CPU-local variables that other CPUs neither * variables that other CPUs neither access nor modify,
* access nor modify, at least not while the corresponding * at least not while the corresponding CPU is online.
* CPU is online.
*/ */
rcu_qsctr_inc(cpu); rcu_sched_qs(cpu);
rcu_bh_qsctr_inc(cpu); rcu_bh_qs(cpu);
} else if (!in_softirq()) { } else if (!in_softirq()) {
@ -991,10 +999,10 @@ void rcu_check_callbacks(int cpu, int user)
* Get here if this CPU did not take its interrupt from * Get here if this CPU did not take its interrupt from
* softirq, in other words, if it is not interrupting * softirq, in other words, if it is not interrupting
* a rcu_bh read-side critical section. This is an _bh * a rcu_bh read-side critical section. This is an _bh
* critical section, so count it. * critical section, so note it.
*/ */
rcu_bh_qsctr_inc(cpu); rcu_bh_qs(cpu);
} }
raise_softirq(RCU_SOFTIRQ); raise_softirq(RCU_SOFTIRQ);
} }
@ -1174,7 +1182,8 @@ static void rcu_process_callbacks(struct softirq_action *unused)
*/ */
smp_mb(); /* See above block comment. */ smp_mb(); /* See above block comment. */
__rcu_process_callbacks(&rcu_state, &__get_cpu_var(rcu_data)); __rcu_process_callbacks(&rcu_sched_state,
&__get_cpu_var(rcu_sched_data));
__rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data)); __rcu_process_callbacks(&rcu_bh_state, &__get_cpu_var(rcu_bh_data));
/* /*
@ -1231,14 +1240,25 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
} }
/* /*
* Queue an RCU callback for invocation after a grace period. * Queue an RCU-sched callback for invocation after a grace period.
*/
void call_rcu_sched(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
{
__call_rcu(head, func, &rcu_sched_state);
}
EXPORT_SYMBOL_GPL(call_rcu_sched);
/*
* @@@ Queue an RCU callback for invocation after a grace period.
* @@@ Placeholder pending rcutree_plugin.h.
*/ */
void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu)) void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu))
{ {
__call_rcu(head, func, &rcu_state); call_rcu_sched(head, func);
} }
EXPORT_SYMBOL_GPL(call_rcu); EXPORT_SYMBOL_GPL(call_rcu);
/* /*
* Queue an RCU for invocation after a quicker grace period. * Queue an RCU for invocation after a quicker grace period.
*/ */
@ -1311,7 +1331,7 @@ static int __rcu_pending(struct rcu_state *rsp, struct rcu_data *rdp)
*/ */
int rcu_pending(int cpu) int rcu_pending(int cpu)
{ {
return __rcu_pending(&rcu_state, &per_cpu(rcu_data, cpu)) || return __rcu_pending(&rcu_sched_state, &per_cpu(rcu_sched_data, cpu)) ||
__rcu_pending(&rcu_bh_state, &per_cpu(rcu_bh_data, cpu)); __rcu_pending(&rcu_bh_state, &per_cpu(rcu_bh_data, cpu));
} }
@ -1324,7 +1344,7 @@ int rcu_pending(int cpu)
int rcu_needs_cpu(int cpu) int rcu_needs_cpu(int cpu)
{ {
/* RCU callbacks either ready or pending? */ /* RCU callbacks either ready or pending? */
return per_cpu(rcu_data, cpu).nxtlist || return per_cpu(rcu_sched_data, cpu).nxtlist ||
per_cpu(rcu_bh_data, cpu).nxtlist; per_cpu(rcu_bh_data, cpu).nxtlist;
} }
@ -1418,7 +1438,7 @@ rcu_init_percpu_data(int cpu, struct rcu_state *rsp)
static void __cpuinit rcu_online_cpu(int cpu) static void __cpuinit rcu_online_cpu(int cpu)
{ {
rcu_init_percpu_data(cpu, &rcu_state); rcu_init_percpu_data(cpu, &rcu_sched_state);
rcu_init_percpu_data(cpu, &rcu_bh_state); rcu_init_percpu_data(cpu, &rcu_bh_state);
} }
@ -1545,10 +1565,10 @@ void __init __rcu_init(void)
#ifdef CONFIG_RCU_CPU_STALL_DETECTOR #ifdef CONFIG_RCU_CPU_STALL_DETECTOR
printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n"); printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n");
#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */ #endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
rcu_init_one(&rcu_state); rcu_init_one(&rcu_sched_state);
RCU_DATA_PTR_INIT(&rcu_state, rcu_data); RCU_DATA_PTR_INIT(&rcu_sched_state, rcu_sched_data);
for_each_possible_cpu(i) for_each_possible_cpu(i)
rcu_boot_init_percpu_data(i, &rcu_state); rcu_boot_init_percpu_data(i, &rcu_sched_state);
rcu_init_one(&rcu_bh_state); rcu_init_one(&rcu_bh_state);
RCU_DATA_PTR_INIT(&rcu_bh_state, rcu_bh_data); RCU_DATA_PTR_INIT(&rcu_bh_state, rcu_bh_data);
for_each_possible_cpu(i) for_each_possible_cpu(i)

4
kernel/rcutree.h
View file

@ -238,8 +238,8 @@ struct rcu_state {
/* /*
* RCU implementation internal declarations: * RCU implementation internal declarations:
*/ */
extern struct rcu_state rcu_state; extern struct rcu_state rcu_sched_state;
DECLARE_PER_CPU(struct rcu_data, rcu_data); DECLARE_PER_CPU(struct rcu_data, rcu_sched_data);
extern struct rcu_state rcu_bh_state; extern struct rcu_state rcu_bh_state;
DECLARE_PER_CPU(struct rcu_data, rcu_bh_data); DECLARE_PER_CPU(struct rcu_data, rcu_bh_data);

20
kernel/rcutree_trace.c
View file

@ -77,8 +77,8 @@ static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
static int show_rcudata(struct seq_file *m, void *unused) static int show_rcudata(struct seq_file *m, void *unused)
{ {
seq_puts(m, "rcu:\n"); seq_puts(m, "rcu_sched:\n");
PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m); PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
seq_puts(m, "rcu_bh:\n"); seq_puts(m, "rcu_bh:\n");
PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m); PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
return 0; return 0;
@ -125,8 +125,8 @@ static int show_rcudata_csv(struct seq_file *m, void *unused)
seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\","); seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
#endif /* #ifdef CONFIG_NO_HZ */ #endif /* #ifdef CONFIG_NO_HZ */
seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n"); seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
seq_puts(m, "\"rcu:\"\n"); seq_puts(m, "\"rcu_sched:\"\n");
PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m); PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
seq_puts(m, "\"rcu_bh:\"\n"); seq_puts(m, "\"rcu_bh:\"\n");
PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m); PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
return 0; return 0;
@ -172,8 +172,8 @@ static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
static int show_rcuhier(struct seq_file *m, void *unused) static int show_rcuhier(struct seq_file *m, void *unused)
{ {
seq_puts(m, "rcu:\n"); seq_puts(m, "rcu_sched:\n");
print_one_rcu_state(m, &rcu_state); print_one_rcu_state(m, &rcu_sched_state);
seq_puts(m, "rcu_bh:\n"); seq_puts(m, "rcu_bh:\n");
print_one_rcu_state(m, &rcu_bh_state); print_one_rcu_state(m, &rcu_bh_state);
return 0; return 0;
@ -194,8 +194,8 @@ static struct file_operations rcuhier_fops = {
static int show_rcugp(struct seq_file *m, void *unused) static int show_rcugp(struct seq_file *m, void *unused)
{ {
seq_printf(m, "rcu: completed=%ld gpnum=%ld\n", seq_printf(m, "rcu_sched: completed=%ld gpnum=%ld\n",
rcu_state.completed, rcu_state.gpnum); rcu_sched_state.completed, rcu_sched_state.gpnum);
seq_printf(m, "rcu_bh: completed=%ld gpnum=%ld\n", seq_printf(m, "rcu_bh: completed=%ld gpnum=%ld\n",
rcu_bh_state.completed, rcu_bh_state.gpnum); rcu_bh_state.completed, rcu_bh_state.gpnum);
return 0; return 0;
@ -244,8 +244,8 @@ static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
static int show_rcu_pending(struct seq_file *m, void *unused) static int show_rcu_pending(struct seq_file *m, void *unused)
{ {
seq_puts(m, "rcu:\n"); seq_puts(m, "rcu_sched:\n");
print_rcu_pendings(m, &rcu_state); print_rcu_pendings(m, &rcu_sched_state);
seq_puts(m, "rcu_bh:\n"); seq_puts(m, "rcu_bh:\n");
print_rcu_pendings(m, &rcu_bh_state); print_rcu_pendings(m, &rcu_bh_state);
return 0; return 0;

2
kernel/sched.c
View file

@ -5325,7 +5325,7 @@ need_resched:
preempt_disable(); preempt_disable();
cpu = smp_processor_id(); cpu = smp_processor_id();
rq = cpu_rq(cpu); rq = cpu_rq(cpu);
rcu_qsctr_inc(cpu); rcu_sched_qs(cpu);
prev = rq->curr; prev = rq->curr;
switch_count = &prev->nivcsw; switch_count = &prev->nivcsw;

4
kernel/softirq.c
View file

@ -227,7 +227,7 @@ restart:
preempt_count() = prev_count; preempt_count() = prev_count;
} }
rcu_bh_qsctr_inc(cpu); rcu_bh_qs(cpu);
} }
h++; h++;
pending >>= 1; pending >>= 1;
@ -721,7 +721,7 @@ static int ksoftirqd(void * __bind_cpu)
preempt_enable_no_resched(); preempt_enable_no_resched();
cond_resched(); cond_resched();
preempt_disable(); preempt_disable();
rcu_qsctr_inc((long)__bind_cpu); rcu_sched_qs((long)__bind_cpu);
} }
preempt_enable(); preempt_enable();
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);