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authorMilind Changire <mchangir@redhat.com>2018-02-26 15:14:18 +0530
committerMilind Changire <mchangir@redhat.com>2018-02-26 15:14:38 +0530
commit7d641313f46789ec0a7ba0cc04f504724c780855 (patch)
tree6111a02fd1e338de69bae6acdea833c946b1fb94 /rpc/rpc-lib/src
parenta1e59bc8fd220b4cba038e2db2630665ba871b50 (diff)
rpcsvc: scale rpcsvc_request_handler threads
Scale rpcsvc_request_handler threads to match the scaling of event handler threads. Please refer to https://bugzilla.redhat.com/show_bug.cgi?id=1467614#c51 for a discussion about why we need multi-threaded rpcsvc request handlers. Change-Id: Ib6838fb8b928e15602a3d36fd66b7ba08999430b Signed-off-by: Milind Changire <mchangir@redhat.com>
Diffstat (limited to 'rpc/rpc-lib/src')
-rw-r--r--rpc/rpc-lib/src/libgfrpc.sym1
-rw-r--r--rpc/rpc-lib/src/rpcsvc.c131
-rw-r--r--rpc/rpc-lib/src/rpcsvc.h8
3 files changed, 123 insertions, 17 deletions
diff --git a/rpc/rpc-lib/src/libgfrpc.sym b/rpc/rpc-lib/src/libgfrpc.sym
index 89923b2..7d878ab 100644
--- a/rpc/rpc-lib/src/libgfrpc.sym
+++ b/rpc/rpc-lib/src/libgfrpc.sym
@@ -53,6 +53,7 @@ rpcsvc_transport_connect
rpcsvc_transport_getpeeraddr
rpcsvc_unregister_notify
rpcsvc_volume_allowed
+rpcsvc_ownthread_reconf
rpc_transport_count
rpc_transport_connect
rpc_transport_disconnect
diff --git a/rpc/rpc-lib/src/rpcsvc.c b/rpc/rpc-lib/src/rpcsvc.c
index 8766da4..34e7563 100644
--- a/rpc/rpc-lib/src/rpcsvc.c
+++ b/rpc/rpc-lib/src/rpcsvc.c
@@ -1970,33 +1970,98 @@ rpcsvc_request_handler (void *arg)
goto unlock;
}
- while (list_empty (&program->request_queue))
+ while (list_empty (&program->request_queue) &&
+ (program->threadcount <=
+ program->eventthreadcount)) {
pthread_cond_wait (&program->queue_cond,
&program->queue_lock);
+ }
- req = list_entry (program->request_queue.next,
- typeof (*req), request_list);
-
- list_del_init (&req->request_list);
+ if (program->threadcount > program->eventthreadcount) {
+ done = 1;
+ program->threadcount--;
+
+ gf_log (GF_RPCSVC, GF_LOG_INFO,
+ "program '%s' thread terminated; "
+ "total count:%d",
+ program->progname,
+ program->threadcount);
+ } else if (!list_empty (&program->request_queue)) {
+ req = list_entry (program->request_queue.next,
+ typeof (*req), request_list);
+
+ list_del_init (&req->request_list);
+ }
}
unlock:
pthread_mutex_unlock (&program->queue_lock);
+ if (req) {
+ THIS = req->svc->xl;
+ actor = rpcsvc_program_actor (req);
+ ret = actor->actor (req);
+
+ if (ret != 0) {
+ rpcsvc_check_and_reply_error (ret, NULL, req);
+ }
+ req = NULL;
+ }
+
if (done)
break;
+ }
- THIS = req->svc->xl;
+ return NULL;
+}
- actor = rpcsvc_program_actor (req);
+int
+rpcsvc_spawn_threads (rpcsvc_t *svc, rpcsvc_program_t *program)
+{
+ int ret = 0, delta = 0, creates = 0;
- ret = actor->actor (req);
+ if (!program || !svc)
+ goto out;
- if (ret != 0) {
- rpcsvc_check_and_reply_error (ret, NULL, req);
+ pthread_mutex_lock (&program->queue_lock);
+ {
+ delta = program->eventthreadcount - program->threadcount;
+
+ if (delta >= 0) {
+ while (delta--) {
+ ret = gf_thread_create (&program->thread, NULL,
+ rpcsvc_request_handler,
+ program, "rpcrqhnd");
+ if (!ret) {
+ program->threadcount++;
+ creates++;
+ }
+ }
+
+ if (creates) {
+ gf_log (GF_RPCSVC, GF_LOG_INFO,
+ "spawned %d threads for program '%s'; "
+ "total count:%d",
+ creates,
+ program->progname,
+ program->threadcount);
+ }
+ } else {
+ gf_log (GF_RPCSVC, GF_LOG_INFO,
+ "terminating %d threads for program '%s'",
+ -delta, program->progname);
+
+ /* this signal is to just wake up the threads so they
+ * test for the change in eventthreadcount and kill
+ * themselves until the program thread count becomes
+ * equal to the event thread count
+ */
+ pthread_cond_broadcast (&program->queue_cond);
}
}
+ pthread_mutex_unlock (&program->queue_lock);
- return NULL;
+out:
+ return creates;
}
int
@@ -2004,6 +2069,7 @@ rpcsvc_program_register (rpcsvc_t *svc, rpcsvc_program_t *program,
gf_boolean_t add_to_head)
{
int ret = -1;
+ int creates = -1;
rpcsvc_program_t *newprog = NULL;
char already_registered = 0;
@@ -2051,12 +2117,11 @@ rpcsvc_program_register (rpcsvc_t *svc, rpcsvc_program_t *program,
newprog->ownthread = _gf_false;
if (newprog->ownthread) {
- ret = gf_thread_create (&newprog->thread, NULL,
- rpcsvc_request_handler,
- newprog, "rpcsvcrh");
- if (ret != 0) {
- gf_log (GF_RPCSVC, GF_LOG_ERROR,
- "error creating request handler thread");
+ newprog->eventthreadcount = 1;
+ creates = rpcsvc_spawn_threads (svc, newprog);
+
+ if (creates < 1) {
+ goto out;
}
}
@@ -2924,6 +2989,38 @@ out:
return ret;
}
+/* During reconfigure, Make sure to call this function after event-threads are
+ * reconfigured as programs' threadcount will be made equal to event threads.
+ */
+
+int
+rpcsvc_ownthread_reconf (rpcsvc_t *svc, int new_eventthreadcount)
+{
+ int ret = -1;
+ rpcsvc_program_t *program = NULL;
+
+ if (!svc) {
+ ret = 0;
+ goto out;
+ }
+
+ pthread_rwlock_wrlock (&svc->rpclock);
+ {
+ list_for_each_entry (program, &svc->programs, program) {
+ if (program->ownthread) {
+ program->eventthreadcount =
+ new_eventthreadcount;
+ rpcsvc_spawn_threads (svc, program);
+ }
+ }
+ }
+ pthread_rwlock_unlock (&svc->rpclock);
+
+ ret = 0;
+out:
+ return ret;
+}
+
rpcsvc_actor_t gluster_dump_actors[GF_DUMP_MAXVALUE] = {
[GF_DUMP_NULL] = {"NULL", GF_DUMP_NULL, NULL, NULL, 0, DRC_NA},
diff --git a/rpc/rpc-lib/src/rpcsvc.h b/rpc/rpc-lib/src/rpcsvc.h
index 878eea2..ec76b65 100644
--- a/rpc/rpc-lib/src/rpcsvc.h
+++ b/rpc/rpc-lib/src/rpcsvc.h
@@ -422,6 +422,12 @@ struct rpcsvc_program {
pthread_mutex_t queue_lock;
pthread_cond_t queue_cond;
pthread_t thread;
+ int threadcount;
+ /* eventthreadcount is just a readonly copy of the actual value
+ * owned by the event sub-system
+ * It is used to control the scaling of rpcsvc_request_handler threads
+ */
+ int eventthreadcount;
};
typedef struct rpcsvc_cbk_program {
@@ -639,4 +645,6 @@ rpcsvc_auth_array (rpcsvc_t *svc, char *volname, int *autharr, int arrlen);
rpcsvc_vector_sizer
rpcsvc_get_program_vector_sizer (rpcsvc_t *svc, uint32_t prognum,
uint32_t progver, int procnum);
+extern int
+rpcsvc_ownthread_reconf (rpcsvc_t *svc, int new_eventthreadcount);
#endif