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event: Add support for rusage monitor for the reactors.

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This patch Log a message in the reactor if any context switches occur.

Change-Id: I5306a5d29bce57ee9383d3ffdc9a0f7916a5b813
Signed-off-by: Cunyin Chang <cunyin.chang@intel.com>
Reviewed-on: https://review.gerrithub.io/374560
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Cunyin Chang 2017-08-17 09:59:06 +08:00 committed by Jim Harris
parent 1b67738c65
commit 8d70322aa8
1 changed files with 37 additions and 1 deletions
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38
lib/event/reactor.c
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@ -34,6 +34,7 @@
#include "spdk/stdinc.h" #include "spdk/stdinc.h"
#include "spdk_internal/event.h" #include "spdk_internal/event.h"
#include "spdk_internal/log.h"
#ifdef __linux__ #ifdef __linux__
#include <sys/prctl.h> #include <sys/prctl.h>
@ -94,7 +95,13 @@ struct spdk_reactor {
/* Socket ID for this reactor. */ /* Socket ID for this reactor. */
uint32_t socket_id; uint32_t socket_id;
#ifdef DEBUG
/* Poller for get the rusage for the reactor. */
struct spdk_poller *rusage_poller;
/* The last known rusage values */
struct rusage rusage;
#endif
/* /*
* Contains pollers actively running on this reactor. Pollers * Contains pollers actively running on this reactor. Pollers
* are run round-robin. The reactor takes one poller from the head * are run round-robin. The reactor takes one poller from the head
@ -276,6 +283,27 @@ _spdk_reactor_send_msg(spdk_thread_fn fn, void *ctx, void *thread_ctx)
spdk_event_call(event); spdk_event_call(event);
} }
#ifdef DEBUG
static void
get_rusage(void *arg)
{
struct spdk_reactor *reactor = arg;
struct rusage rusage;
if (getrusage(RUSAGE_THREAD, &rusage) != 0) {
return;
}
if (rusage.ru_nvcsw != reactor->rusage.ru_nvcsw || rusage.ru_nivcsw != reactor->rusage.ru_nivcsw) {
SPDK_TRACELOG(SPDK_TRACE_REACTOR,
"Reactor %d: %ld voluntary context switches and %ld involuntary context switches in the last second.\n",
reactor->lcore, rusage.ru_nvcsw - reactor->rusage.ru_nvcsw,
rusage.ru_nivcsw - reactor->rusage.ru_nivcsw);
}
reactor->rusage = rusage;
}
#endif
/** /**
* *
* \brief This is the main function of the reactor thread. * \brief This is the main function of the reactor thread.
@ -317,7 +345,10 @@ _spdk_reactor_run(void *arg)
sleep_cycles = reactor->max_delay_us * spdk_get_ticks_hz() / 1000000ULL; sleep_cycles = reactor->max_delay_us * spdk_get_ticks_hz() / 1000000ULL;
idle_started = 0; idle_started = 0;
timer_poll_count = 0; timer_poll_count = 0;
#ifdef DEBUG
getrusage(RUSAGE_THREAD, &reactor->rusage);
spdk_poller_register(&reactor->rusage_poller, get_rusage, reactor, reactor->lcore, 1000000);
#endif
while (1) { while (1) {
bool took_action = false; bool took_action = false;
@ -400,6 +431,9 @@ _spdk_reactor_run(void *arg)
} }
if (g_reactor_state != SPDK_REACTOR_STATE_RUNNING) { if (g_reactor_state != SPDK_REACTOR_STATE_RUNNING) {
#ifdef DEBUG
spdk_poller_unregister(&reactor->rusage_poller, NULL);
#endif
break; break;
} }
} }
@ -768,3 +802,5 @@ spdk_poller_unregister(struct spdk_poller **ppoller,
spdk_event_call(spdk_event_allocate(lcore, _spdk_event_remove_poller, poller, complete)); spdk_event_call(spdk_event_allocate(lcore, _spdk_event_remove_poller, poller, complete));
} }
} }
SPDK_LOG_REGISTER_TRACE_FLAG("reactor", SPDK_TRACE_REACTOR)