Author: mmacy
Date: Fri Jul 6 06:20:03 2018
New Revision: 336021
URL: https://svnweb.freebsd.org/changeset/base/336021
Log:
epoch(9): simplify initialization
replace manual NUMA aware allocation with a pcpu zone
Modified:
head/sys/kern/subr_epoch.c
head/sys/sys/epoch_private.h
Modified: head/sys/kern/subr_epoch.c
==============================================================================
--- head/sys/kern/subr_epoch.c Fri Jul 6 02:06:03 2018 (r336020)
+++ head/sys/kern/subr_epoch.c Fri Jul 6 06:20:03 2018 (r336021)
@@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
+#include <vm/uma.h>
#include <ck_epoch.h>
@@ -93,29 +94,23 @@ TAILQ_HEAD (threadlist, thread);
CK_STACK_CONTAINER(struct ck_epoch_entry, stack_entry,
ck_epoch_entry_container)
- epoch_t allepochs[MAX_EPOCHS];
+epoch_t allepochs[MAX_EPOCHS];
DPCPU_DEFINE(struct grouptask, epoch_cb_task);
DPCPU_DEFINE(int, epoch_cb_count);
-static __read_mostly int domcount[MAXMEMDOM];
-static __read_mostly int domoffsets[MAXMEMDOM];
static __read_mostly int inited;
static __read_mostly int epoch_count;
__read_mostly epoch_t global_epoch;
__read_mostly epoch_t global_epoch_preempt;
static void epoch_call_task(void *context __unused);
+static uma_zone_t pcpu_zone_record;
-#if defined(__powerpc64__) || defined(__powerpc__) || !defined(NUMA)
-static bool usedomains = false;
-#else
-static bool usedomains = true;
-#endif
static void
epoch_init(void *arg __unused)
{
- int domain, cpu;
+ int cpu;
block_count = counter_u64_alloc(M_WAITOK);
migrate_count = counter_u64_alloc(M_WAITOK);
@@ -123,25 +118,9 @@ epoch_init(void *arg __unused)
switch_count = counter_u64_alloc(M_WAITOK);
epoch_call_count = counter_u64_alloc(M_WAITOK);
epoch_call_task_count = counter_u64_alloc(M_WAITOK);
- if (usedomains == false)
- goto done;
- domain = 0;
- domoffsets[0] = 0;
- for (domain = 0; domain < vm_ndomains; domain++) {
- domcount[domain] = CPU_COUNT(&cpuset_domain[domain]);
- if (bootverbose)
- printf("domcount[%d] %d\n", domain, domcount[domain]);
- }
- for (domain = 1; domain < vm_ndomains; domain++)
- domoffsets[domain] = domoffsets[domain - 1] + domcount[domain -
1];
- for (domain = 0; domain < vm_ndomains; domain++) {
- if (domcount[domain] == 0) {
- usedomains = false;
- break;
- }
- }
-done:
+ pcpu_zone_record = uma_zcreate("epoch_record pcpu", sizeof(struct
epoch_record),
+ NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_PCPU);
CPU_FOREACH(cpu) {
GROUPTASK_INIT(DPCPU_ID_PTR(cpu, epoch_cb_task), 0,
epoch_call_task, NULL);
taskqgroup_attach_cpu(qgroup_softirq, DPCPU_ID_PTR(cpu,
epoch_cb_task), NULL, cpu, -1, "epoch call task");
@@ -161,39 +140,19 @@ epoch_init_smp(void *dummy __unused)
SYSINIT(epoch_smp, SI_SUB_SMP + 1, SI_ORDER_FIRST, epoch_init_smp, NULL);
#endif
-
static void
-epoch_init_numa(epoch_t epoch)
+epoch_ctor(epoch_t epoch)
{
- int domain, cpu_offset;
epoch_record_t er;
+ int cpu;
- for (domain = 0; domain < vm_ndomains; domain++) {
- er = malloc_domain(sizeof(*er) * domcount[domain], M_EPOCH,
- domain, M_ZERO | M_WAITOK);
- epoch->e_pcpu_dom[domain] = er;
- cpu_offset = domoffsets[domain];
- for (int i = 0; i < domcount[domain]; i++, er++) {
- epoch->e_pcpu[cpu_offset + i] = er;
- ck_epoch_register(&epoch->e_epoch, &er->er_record,
NULL);
- TAILQ_INIT((struct threadlist
*)(uintptr_t)&er->er_tdlist);
- er->er_cpuid = cpu_offset + i;
- }
- }
-}
-
-static void
-epoch_init_legacy(epoch_t epoch)
-{
- epoch_record_t er;
-
- er = malloc(sizeof(*er) * mp_ncpus, M_EPOCH, M_ZERO | M_WAITOK);
- epoch->e_pcpu_dom[0] = er;
- for (int i = 0; i < mp_ncpus; i++, er++) {
- epoch->e_pcpu[i] = er;
+ epoch->e_pcpu_record = uma_zalloc_pcpu(pcpu_zone_record, M_WAITOK);
+ CPU_FOREACH(cpu) {
+ er = zpcpu_get_cpu(epoch->e_pcpu_record, cpu);
+ bzero(er, sizeof(*er));
ck_epoch_register(&epoch->e_epoch, &er->er_record, NULL);
TAILQ_INIT((struct threadlist *)(uintptr_t)&er->er_tdlist);
- er->er_cpuid = i;
+ er->er_cpuid = cpu;
}
}
@@ -204,13 +163,9 @@ epoch_alloc(int flags)
if (__predict_false(!inited))
panic("%s called too early in boot", __func__);
- epoch = malloc(sizeof(struct epoch) + mp_ncpus * sizeof(void *),
- M_EPOCH, M_ZERO | M_WAITOK);
+ epoch = malloc(sizeof(struct epoch), M_EPOCH, M_ZERO | M_WAITOK);
ck_epoch_init(&epoch->e_epoch);
- if (usedomains)
- epoch_init_numa(epoch);
- else
- epoch_init_legacy(epoch);
+ epoch_ctor(epoch);
MPASS(epoch_count < MAX_EPOCHS - 2);
epoch->e_flags = flags;
epoch->e_idx = epoch_count;
@@ -221,23 +176,18 @@ epoch_alloc(int flags)
void
epoch_free(epoch_t epoch)
{
- int domain;
#ifdef INVARIANTS
struct epoch_record *er;
int cpu;
CPU_FOREACH(cpu) {
- er = epoch->e_pcpu[cpu];
+ er = zpcpu_get_cpu(epoch->e_pcpu_record, cpu);
MPASS(TAILQ_EMPTY(&er->er_tdlist));
}
#endif
allepochs[epoch->e_idx] = NULL;
epoch_wait(global_epoch);
- if (usedomains)
- for (domain = 0; domain < vm_ndomains; domain++)
- free_domain(epoch->e_pcpu_dom[domain], M_EPOCH);
- else
- free(epoch->e_pcpu_dom[0], M_EPOCH);
+ uma_zfree_pcpu(pcpu_zone_record, epoch->e_pcpu_record);
free(epoch, M_EPOCH);
}
@@ -496,7 +446,7 @@ epoch_call(epoch_t epoch, epoch_context_t ctx, void (*
critical_enter();
*DPCPU_PTR(epoch_cb_count) += 1;
- er = epoch->e_pcpu[curcpu];
+ er = epoch_currecord(epoch);
ck_epoch_call(&er->er_record, cb, (ck_epoch_cb_t *)callback);
critical_exit();
return;
@@ -509,6 +459,7 @@ epoch_call_task(void *arg __unused)
{
ck_stack_entry_t *cursor, *head, *next;
ck_epoch_record_t *record;
+ epoch_record_t er;
epoch_t epoch;
ck_stack_t cb_stack;
int i, npending, total;
@@ -519,7 +470,8 @@ epoch_call_task(void *arg __unused)
for (total = i = 0; i < epoch_count; i++) {
if (__predict_false((epoch = allepochs[i]) == NULL))
continue;
- record = &epoch->e_pcpu[curcpu]->er_record;
+ er = epoch_currecord(epoch);
+ record = &er->er_record;
if ((npending = record->n_pending) == 0)
continue;
ck_epoch_poll_deferred(record, &cb_stack);
@@ -555,7 +507,7 @@ in_epoch_verbose(epoch_t epoch, int dump_onfail)
if (__predict_false((epoch) == NULL))
return (0);
critical_enter();
- er = epoch->e_pcpu[curcpu];
+ er = epoch_currecord(epoch);
TAILQ_FOREACH(tdwait, &er->er_tdlist, et_link)
if (tdwait->et_td == td) {
critical_exit();
Modified: head/sys/sys/epoch_private.h
==============================================================================
--- head/sys/sys/epoch_private.h Fri Jul 6 02:06:03 2018
(r336020)
+++ head/sys/sys/epoch_private.h Fri Jul 6 06:20:03 2018
(r336021)
@@ -97,12 +97,17 @@ typedef struct epoch_record {
struct epoch {
struct ck_epoch e_epoch __aligned(EPOCH_ALIGN);
- struct epoch_record *e_pcpu_dom[MAXMEMDOM] __aligned(EPOCH_ALIGN);
+ epoch_record_t e_pcpu_record;
int e_idx;
int e_flags;
- struct epoch_record *e_pcpu[0];
};
+static epoch_record_t
+epoch_currecord(epoch_t epoch)
+{
+ return zpcpu_get_cpu(epoch->e_pcpu_record, curcpu);
+}
+
#define INIT_CHECK(epoch)
\
do {
\
if (__predict_false((epoch) == NULL)) \
@@ -115,6 +120,7 @@ epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et)
struct epoch_record *er;
struct epoch_thread *etd;
struct thread_lite *td;
+
MPASS(cold || epoch != NULL);
INIT_CHECK(epoch);
etd = (void *)et;
@@ -130,7 +136,7 @@ epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et)
sched_pin_lite(td);
td->td_pre_epoch_prio = td->td_priority;
- er = epoch->e_pcpu[curcpu];
+ er = epoch_currecord(epoch);
TAILQ_INSERT_TAIL(&er->er_tdlist, etd, et_link);
ck_epoch_begin(&er->er_record, (ck_epoch_section_t *)&etd->et_section);
critical_exit_sa(td);
@@ -139,16 +145,17 @@ epoch_enter_preempt(epoch_t epoch, epoch_tracker_t et)
static __inline void
epoch_enter(epoch_t epoch)
{
- ck_epoch_record_t *record;
struct thread_lite *td;
+ epoch_record_t er;
+
MPASS(cold || epoch != NULL);
INIT_CHECK(epoch);
td = (struct thread_lite *)curthread;
td->td_epochnest++;
critical_enter_sa(td);
- record = &epoch->e_pcpu[curcpu]->er_record;
- ck_epoch_begin(record, NULL);
+ er = epoch_currecord(epoch);
+ ck_epoch_begin(&er->er_record, NULL);
}
static __inline void
@@ -164,7 +171,7 @@ epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et)
sched_unpin_lite(td);
MPASS(td->td_epochnest);
td->td_epochnest--;
- er = epoch->e_pcpu[curcpu];
+ er = epoch_currecord(epoch);
MPASS(epoch->e_flags & EPOCH_PREEMPT);
etd = (void *)et;
#ifdef INVARIANTS
@@ -188,15 +195,15 @@ epoch_exit_preempt(epoch_t epoch, epoch_tracker_t et)
static __inline void
epoch_exit(epoch_t epoch)
{
- ck_epoch_record_t *record;
struct thread_lite *td;
+ epoch_record_t er;
INIT_CHECK(epoch);
td = (struct thread_lite *)curthread;
MPASS(td->td_epochnest);
td->td_epochnest--;
- record = &epoch->e_pcpu[curcpu]->er_record;
- ck_epoch_end(record, NULL);
+ er = epoch_currecord(epoch);
+ ck_epoch_end(&er->er_record, NULL);
critical_exit_sa(td);
}
#endif /* _KERNEL */
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