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reactor: add cpuset to indicate intr mode

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Each bit of the cpuset indicates whether a reactor
is going to be in interrupt mode.
Each spdk_cpuset is allocated to each reactor. So it
can only be touched by its reactor.

Change-Id: Ic186de341588b701d7471bf09336309d28b1bf4e
Signed-off-by: Liu Xiaodong <xiaodong.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/5850
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
This commit is contained in:
Liu Xiaodong 2021-01-12 07:30:42 -05:00 committed by Tomasz Zawadzki
parent 8689f6a396
commit eff5b149ce
3 changed files with 75 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/spdk_internal/event.h
View File

@ -97,7 +97,10 @@ struct spdk_reactor {
uint64_t busy_tsc;
uint64_t idle_tsc;
bool interrupt_mode;
/* Each bit of cpuset indicates whether a reactor probably requires event notification */
struct spdk_cpuset notify_cpuset;
/* Indicate whether this reactor currently runs in interrupt */
bool in_interrupt;
struct spdk_fd_group *fgrp;
int resched_fd;
} __attribute__((aligned(SPDK_CACHE_LINE_SIZE)));

76
lib/event/reactor.c
View File

@ -172,6 +172,7 @@ reactor_construct(struct spdk_reactor *reactor, uint32_t lcore)
TAILQ_INIT(&reactor->threads);
reactor->thread_count = 0;
spdk_cpuset_zero(&reactor->notify_cpuset);
reactor->events = spdk_ring_create(SPDK_RING_TYPE_MP_SC, 65536, SPDK_ENV_SOCKET_ID_ANY);
if (reactor->events == NULL) {
@ -179,8 +180,26 @@ reactor_construct(struct spdk_reactor *reactor, uint32_t lcore)
assert(false);
}
/* Always initialize interrupt facilities for reactor */
if (reactor_interrupt_init(reactor) != 0) {
/* Reactor interrupt facilities are necessary if seting app to interrupt mode. */
if (spdk_interrupt_mode_is_enabled()) {
SPDK_ERRLOG("Failed to prepare intr facilities\n");
assert(false);
}
return;
}
/* If application runs with full interrupt ability,
* all reactors are going to run in interrupt mode.
*/
if (spdk_interrupt_mode_is_enabled()) {
reactor_interrupt_init(reactor);
uint32_t i;
SPDK_ENV_FOREACH_CORE(i) {
spdk_cpuset_set_cpu(&reactor->notify_cpuset, i, true);
}
reactor->in_interrupt = true;
}
}
@ -298,9 +317,7 @@ spdk_reactors_fini(void)
spdk_ring_free(reactor->events);
}
if (reactor->interrupt_mode) {
reactor_interrupt_fini(reactor);
}
reactor_interrupt_fini(reactor);
if (g_core_infos != NULL) {
free(g_core_infos[i].threads);
@ -345,6 +362,8 @@ spdk_event_call(struct spdk_event *event)
{
int rc;
struct spdk_reactor *reactor;
struct spdk_reactor *local_reactor = NULL;
uint32_t current_core = spdk_env_get_current_core();
reactor = spdk_reactor_get(event->lcore);
@ -356,7 +375,16 @@ spdk_event_call(struct spdk_event *event)
assert(false);
}
if (reactor->interrupt_mode) {
if (current_core != SPDK_ENV_LCORE_ID_ANY) {
local_reactor = spdk_reactor_get(current_core);
}
/* If spdk_event_call isn't called on a reactor, always send a notification.
* If it is called on a reactor, send a notification if the destination reactor
* is indicated in interrupt mode state.
*/
if (spdk_unlikely(local_reactor == NULL) ||
spdk_unlikely(spdk_cpuset_get_cpu(&local_reactor->notify_cpuset, event->lcore))) {
uint64_t notify = 1;
rc = write(reactor->events_fd, &notify, sizeof(notify));
@ -383,7 +411,8 @@ event_queue_run_batch(struct spdk_reactor *reactor)
memset(events, 0, sizeof(events));
#endif
if (reactor->interrupt_mode) {
/* Operate event notification if this reactor currently runs in interrupt state */
if (spdk_unlikely(reactor->in_interrupt)) {
uint64_t notify = 1;
int rc;
@ -638,7 +667,8 @@ reactor_post_process_lw_thread(struct spdk_reactor *reactor, struct spdk_lw_thre
assert(reactor->thread_count > 0);
reactor->thread_count--;
if (reactor->interrupt_mode) {
/* Operate thread intr if running with full interrupt ability */
if (spdk_interrupt_mode_is_enabled()) {
efd = spdk_thread_get_interrupt_fd(thread);
spdk_fd_group_remove(reactor->fgrp, efd);
}
@ -653,7 +683,8 @@ reactor_post_process_lw_thread(struct spdk_reactor *reactor, struct spdk_lw_thre
assert(reactor->thread_count > 0);
reactor->thread_count--;
if (reactor->interrupt_mode) {
/* Operate thread intr if running with full interrupt ability */
if (spdk_interrupt_mode_is_enabled()) {
efd = spdk_thread_get_interrupt_fd(thread);
spdk_fd_group_remove(reactor->fgrp, efd);
}
@ -728,7 +759,8 @@ reactor_run(void *arg)
reactor->tsc_last = spdk_get_ticks();
while (1) {
if (spdk_unlikely(reactor->interrupt_mode)) {
/* Execute interrupt process fn if this reactor currently runs in interrupt state */
if (spdk_unlikely(reactor->in_interrupt)) {
reactor_interrupt_run(reactor);
} else {
_reactor_run(reactor);
@ -769,7 +801,9 @@ reactor_run(void *arg)
TAILQ_REMOVE(&reactor->threads, lw_thread, link);
assert(reactor->thread_count > 0);
reactor->thread_count--;
if (reactor->interrupt_mode) {
/* Operate thread intr if running with full interrupt ability */
if (spdk_interrupt_mode_is_enabled()) {
int efd = spdk_thread_get_interrupt_fd(thread);
spdk_fd_group_remove(reactor->fgrp, efd);
@ -851,12 +885,18 @@ spdk_reactors_stop(void *arg1)
uint32_t i;
int rc;
struct spdk_reactor *reactor;
struct spdk_reactor *local_reactor;
uint64_t notify = 1;
g_reactor_state = SPDK_REACTOR_STATE_EXITING;
local_reactor = spdk_reactor_get(spdk_env_get_current_core());
if (spdk_interrupt_mode_is_enabled()) {
SPDK_ENV_FOREACH_CORE(i) {
SPDK_ENV_FOREACH_CORE(i) {
/* If spdk_event_call isn't called on a reactor, always send a notification.
* If it is called on a reactor, send a notification if the destination reactor
* is indicated in interrupt mode state.
*/
if (local_reactor == NULL || spdk_cpuset_get_cpu(&local_reactor->notify_cpuset, i)) {
reactor = spdk_reactor_get(i);
assert(reactor != NULL);
rc = write(reactor->events_fd, &notify, sizeof(notify));
@ -888,14 +928,14 @@ _schedule_thread(void *arg1, void *arg2)
int efd;
current_core = spdk_env_get_current_core();
reactor = spdk_reactor_get(current_core);
assert(reactor != NULL);
TAILQ_INSERT_TAIL(&reactor->threads, lw_thread, link);
reactor->thread_count++;
if (reactor->interrupt_mode) {
/* Operate thread intr if running with full interrupt ability */
if (spdk_interrupt_mode_is_enabled()) {
int rc;
struct spdk_thread *thread;
@ -975,7 +1015,9 @@ _reactor_request_thread_reschedule(struct spdk_thread *thread)
current_core = spdk_env_get_current_core();
reactor = spdk_reactor_get(current_core);
assert(reactor != NULL);
if (reactor->interrupt_mode) {
/* Send a notification if the destination reactor is indicated in intr mode state */
if (spdk_unlikely(spdk_cpuset_get_cpu(&reactor->notify_cpuset, reactor->lcore))) {
uint64_t notify = 1;
if (write(reactor->resched_fd, &notify, sizeof(notify)) < 0) {
@ -1086,7 +1128,7 @@ reactor_schedule_thread_event(void *arg)
uint32_t count = 0;
uint64_t notify = 1;
assert(reactor->interrupt_mode);
assert(reactor->in_interrupt);
if (read(reactor->resched_fd, &notify, sizeof(notify)) < 0) {
SPDK_ERRLOG("failed to acknowledge reschedule: %s.\n", spdk_strerror(errno));
@ -1141,11 +1183,11 @@ reactor_interrupt_init(struct spdk_reactor *reactor)
goto err;
}
reactor->interrupt_mode = true;
return 0;
err:
spdk_fd_group_destroy(reactor->fgrp);
reactor->fgrp = NULL;
return rc;
}
#else

15
test/unit/lib/event/reactor.c/reactor_ut.c
View File

@ -53,6 +53,7 @@ test_create_reactor(void)
CU_ASSERT(spdk_reactor_get(0) == &reactor);
spdk_ring_free(reactor.events);
reactor_interrupt_fini(&reactor);
g_reactors = NULL;
}
@ -105,6 +106,8 @@ test_event_call(void)
evt = spdk_event_allocate(0, ut_event_fn, &test1, &test2);
CU_ASSERT(evt != NULL);
MOCK_SET(spdk_env_get_current_core, 0);
spdk_event_call(evt);
reactor = spdk_reactor_get(0);
@ -114,6 +117,8 @@ test_event_call(void)
CU_ASSERT(test1 == 1);
CU_ASSERT(test2 == 0xFF);
MOCK_CLEAR(spdk_env_get_current_core);
spdk_reactors_fini();
free_cores();
@ -138,6 +143,8 @@ test_schedule_thread(void)
spdk_cpuset_set_cpu(&cpuset, 3, true);
g_next_core = 4;
MOCK_SET(spdk_env_get_current_core, 3);
/* _reactor_schedule_thread() will be called in spdk_thread_create()
* at its end because it is passed to SPDK thread library by
* spdk_thread_lib_init().
@ -148,8 +155,6 @@ test_schedule_thread(void)
reactor = spdk_reactor_get(3);
CU_ASSERT(reactor != NULL);
MOCK_SET(spdk_env_get_current_core, 3);
CU_ASSERT(event_queue_run_batch(reactor) == 1);
MOCK_CLEAR(spdk_env_get_current_core);
@ -192,6 +197,7 @@ test_reschedule_thread(void)
spdk_cpuset_set_cpu(&g_reactor_core_mask, 2, true);
g_next_core = 0;
MOCK_SET(spdk_env_get_current_core, 1);
/* Create and schedule the thread to core 1. */
spdk_cpuset_set_cpu(&cpuset, 1, true);
@ -201,7 +207,6 @@ test_reschedule_thread(void)
reactor = spdk_reactor_get(1);
CU_ASSERT(reactor != NULL);
MOCK_SET(spdk_env_get_current_core, 1);
CU_ASSERT(event_queue_run_batch(reactor) == 1);
CU_ASSERT(TAILQ_FIRST(&reactor->threads) == lw_thread);
@ -302,12 +307,15 @@ test_for_each_reactor(void)
for (i = 0; i < 5; i++) {
reactor = spdk_reactor_get(i);
CU_ASSERT(reactor != NULL);
MOCK_SET(spdk_env_get_current_core, i);
event_queue_run_batch(reactor);
CU_ASSERT(count == (i + 1));
CU_ASSERT(done == false);
MOCK_CLEAR(spdk_env_get_current_core);
}
MOCK_SET(spdk_env_get_current_core, 0);
/* After each reactor is called, the completion calls it one more time. */
reactor = spdk_reactor_get(0);
CU_ASSERT(reactor != NULL);
@ -315,6 +323,7 @@ test_for_each_reactor(void)
event_queue_run_batch(reactor);
CU_ASSERT(count == 6);
CU_ASSERT(done == true);
MOCK_CLEAR(spdk_env_get_current_core);
spdk_reactors_fini();