Experiment: different task quantums

we can work around not having tasks-running. This way there are virtually no
conflicting memory accesses between task manager threads.

bin/delv/delv.c

@@ -1623,7 +1623,7 @@ main(int argc, char *argv[]) {
 		fatal("failed to create mctx");
 
 	CHECK(isc_appctx_create(mctx, &actx));
-	CHECK(isc_taskmgr_createinctx(mctx, actx, 1, 0, &taskmgr));
+	CHECK(isc_taskmgr_createinctx(mctx, actx, 1, &taskmgr));
 	CHECK(isc_socketmgr_createinctx(mctx, actx, &socketmgr));
 	CHECK(isc_timermgr_createinctx(mctx, actx, &timermgr));
 

bin/dig/dighost.c

@@ -1363,7 +1363,7 @@ setup_libs(void) {
 
 	isc_log_setdebuglevel(lctx, 0);
 
-	result = isc_taskmgr_create(mctx, 1, 0, &taskmgr);
+	result = isc_taskmgr_create(mctx, 1, &taskmgr);
 	check_result(result, "isc_taskmgr_create");
 
 	result = isc_task_create(taskmgr, 0, &global_task);

bin/dnssec/dnssec-signzone.c

@@ -3853,7 +3853,7 @@ main(int argc, char *argv[]) {
 	print_time(outfp);
 	print_version(outfp);
 
-	result = isc_taskmgr_create(mctx, ntasks, 0, &taskmgr);
+	result = isc_taskmgr_create(mctx, ntasks, &taskmgr);
 	if (result != ISC_R_SUCCESS)
 		fatal("failed to create task manager: %s",
 		      isc_result_totext(result));

bin/named/main.c

@@ -803,7 +803,7 @@ create_managers(void) {
 		      "using %u UDP listener%s per interface",
 		      named_g_udpdisp, named_g_udpdisp == 1 ? "" : "s");
 
-	result = isc_taskmgr_create(named_g_mctx, named_g_cpus, 0,
+	result = isc_taskmgr_create(named_g_mctx, named_g_cpus,
 				    &named_g_taskmgr);
 	if (result != ISC_R_SUCCESS) {
 		UNEXPECTED_ERROR(__FILE__, __LINE__,

bin/nsupdate/nsupdate.c

@@ -885,7 +885,7 @@ setup_system(void) {
 	result = isc_timermgr_create(gmctx, &timermgr);
 	check_result(result, "dns_timermgr_create");
 
-	result = isc_taskmgr_create(gmctx, 1, 0, &taskmgr);
+	result = isc_taskmgr_create(gmctx, 1, &taskmgr);
 	check_result(result, "isc_taskmgr_create");
 
 	result = isc_task_create(taskmgr, 0, &global_task);

bin/rndc/rndc.c

@@ -934,7 +934,7 @@ main(int argc, char **argv) {
 
 	DO("create memory context", isc_mem_create(0, 0, &rndc_mctx));
 	DO("create socket manager", isc_socketmgr_create(rndc_mctx, &socketmgr));
-	DO("create task manager", isc_taskmgr_create(rndc_mctx, 1, 0, &taskmgr));
+	DO("create task manager", isc_taskmgr_create(rndc_mctx, 1, &taskmgr));
 	DO("create task", isc_task_create(taskmgr, 0, &task));
 
 	DO("create logging context", isc_log_create(rndc_mctx, &log, &logconfig));

bin/tests/optional/adb_test.c

@@ -146,7 +146,7 @@ create_managers(void) {
 	isc_result_t result;
 
 	taskmgr = NULL;
-	result = isc_taskmgr_create(mctx, 5, 0, &taskmgr);
+	result = isc_taskmgr_create(mctx, 5, &taskmgr);
 	check_result(result, "isc_taskmgr_create");
 
 	timermgr = NULL;

bin/tests/optional/byaddr_test.c

@@ -114,7 +114,7 @@ main(int argc, char *argv[]) {
 	}
 
 	taskmgr = NULL;
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, 0, &taskmgr)
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, &taskmgr)
 		      == ISC_R_SUCCESS);
 	task = NULL;
 	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &task)

bin/tests/optional/byname_test.c

@@ -228,7 +228,7 @@ main(int argc, char *argv[]) {
 	}
 
 	taskmgr = NULL;
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, 0, &taskmgr) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, &taskmgr) ==
 		      ISC_R_SUCCESS);
 	task = NULL;
 	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &task) ==

bin/tests/optional/gsstest.c

@@ -472,7 +472,7 @@ main(int argc, char *argv[]) {
 	RUNCHECK(dst_lib_init(mctx, NULL));
 
 	taskmgr = NULL;
-	RUNCHECK(isc_taskmgr_create(mctx, 1, 0, &taskmgr));
+	RUNCHECK(isc_taskmgr_create(mctx, 1, &taskmgr));
 	task = NULL;
 	RUNCHECK(isc_task_create(taskmgr, 0, &task));
 	timermgr = NULL;

bin/tests/optional/ratelimiter_test.c

@@ -104,8 +104,7 @@ main(int argc, char *argv[]) {
 	isc_interval_set(&linterval, 1, 0);
 
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, 3, 0, &taskmgr) ==
-		      ISC_R_SUCCESS);
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, 3, &taskmgr) == ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_timermgr_create(mctx, &timermgr) ==
 		      ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &g_task) ==

bin/tests/optional/shutdown_test.c

@@ -183,7 +183,7 @@ main(int argc, char *argv[]) {
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
 	mctx2 = NULL;
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx2) == ISC_R_SUCCESS);
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, 0, &task_manager) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, &task_manager) ==
 		      ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_timermgr_create(mctx, &timer_manager) ==
 		      ISC_R_SUCCESS);

bin/tests/optional/sig0_test.c

@@ -228,8 +228,7 @@ main(int argc, char *argv[]) {
 	dst_result_register();
 
 	taskmgr = NULL;
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, 2, 0, &taskmgr) ==
-		      ISC_R_SUCCESS);
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, 2, &taskmgr) == ISC_R_SUCCESS);
 	task1 = NULL;
 	RUNTIME_CHECK(isc_task_create(taskmgr, 0, &task1) == ISC_R_SUCCESS);
 

bin/tests/optional/sock_test.c

@@ -297,7 +297,7 @@ main(int argc, char *argv[]) {
 	 * The task manager is independent (other than memory context)
 	 */
 	manager = NULL;
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, 0, &manager) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, &manager) ==
 		      ISC_R_SUCCESS);
 
 	/*

bin/tests/optional/task_test.c

@@ -81,7 +81,7 @@ main(int argc, char *argv[]) {
 
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
 
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, 0, &manager) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, workers, &manager) ==
 		      ISC_R_SUCCESS);
 
 	RUNTIME_CHECK(isc_task_create(manager, 0, &t1) == ISC_R_SUCCESS);

bin/tests/optional/timer_test.c

@@ -110,7 +110,7 @@ main(int argc, char *argv[]) {
 	printf("%u workers\n", workers);
 
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx1) == ISC_R_SUCCESS);
-	RUNTIME_CHECK(isc_taskmgr_create(mctx1, workers, 0, &manager) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx1, workers, &manager) ==
 		      ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_timermgr_create(mctx1, &timgr) == ISC_R_SUCCESS);
 

bin/tests/optional/zone_test.c

@@ -284,7 +284,7 @@ main(int argc, char **argv) {
 
 	RUNTIME_CHECK(isc_app_start() == ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_mem_create(0, 0, &mctx) == ISC_R_SUCCESS);
-	RUNTIME_CHECK(isc_taskmgr_create(mctx, 2, 0, &taskmgr) ==
+	RUNTIME_CHECK(isc_taskmgr_create(mctx, 2, &taskmgr) ==
 		      ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_timermgr_create(mctx, &timermgr) == ISC_R_SUCCESS);
 	RUNTIME_CHECK(isc_socketmgr_create(mctx, &socketmgr) == ISC_R_SUCCESS);

bin/tests/system/pipelined/pipequeries.c

@@ -279,7 +279,7 @@ main(int argc, char *argv[]) {
 	RUNCHECK(dst_lib_init(mctx, NULL));
 
 	taskmgr = NULL;
-	RUNCHECK(isc_taskmgr_create(mctx, 1, 0, &taskmgr));
+	RUNCHECK(isc_taskmgr_create(mctx, 1, &taskmgr));
 	task = NULL;
 	RUNCHECK(isc_task_create(taskmgr, 0, &task));
 	timermgr = NULL;

bin/tests/system/tkey/keycreate.c

@@ -239,7 +239,7 @@ main(int argc, char *argv[]) {
 	RUNCHECK(dst_lib_init(mctx, NULL));
 
 	taskmgr = NULL;
-	RUNCHECK(isc_taskmgr_create(mctx, 1, 0, &taskmgr));
+	RUNCHECK(isc_taskmgr_create(mctx, 1, &taskmgr));
 	task = NULL;
 	RUNCHECK(isc_task_create(taskmgr, 0, &task));
 	timermgr = NULL;

bin/tests/system/tkey/keydelete.c

@@ -178,7 +178,7 @@ main(int argc, char **argv) {
 	RUNCHECK(dst_lib_init(mctx, NULL));
 
 	taskmgr = NULL;
-	RUNCHECK(isc_taskmgr_create(mctx, 1, 0, &taskmgr));
+	RUNCHECK(isc_taskmgr_create(mctx, 1, &taskmgr));
 	task = NULL;
 	RUNCHECK(isc_task_create(taskmgr, 0, &task));
 	timermgr = NULL;

bin/tools/mdig.c

@@ -1981,7 +1981,7 @@ main(int argc, char *argv[]) {
 		fatal("can't choose between IPv4 and IPv6");
 
 	taskmgr = NULL;
-	RUNCHECK(isc_taskmgr_create(mctx, 1, 0, &taskmgr));
+	RUNCHECK(isc_taskmgr_create(mctx, 1, &taskmgr));
 	task = NULL;
 	RUNCHECK(isc_task_create(taskmgr, 0, &task));
 	timermgr = NULL;

lib/dns/client.c

@@ -64,9 +64,9 @@
 #define MAX_RESTARTS 16
 
 #ifdef TUNE_LARGE
-#define RESOLVER_NTASKS 523
+#define RESOLVER_NTASKS 24
 #else
-#define RESOLVER_NTASKS 31
+#define RESOLVER_NTASKS 48
 #endif /* TUNE_LARGE */
 
 /*%
@@ -379,7 +379,7 @@ dns_client_create(dns_client_t **clientp, unsigned int options) {
 	result = isc_app_ctxstart(actx);
 	if (result != ISC_R_SUCCESS)
 		goto cleanup;
-	result = isc_taskmgr_createinctx(mctx, actx, 1, 0, &taskmgr);
+	result = isc_taskmgr_createinctx(mctx, actx, 1, &taskmgr);
 	if (result != ISC_R_SUCCESS)
 		goto cleanup;
 	result = isc_socketmgr_createinctx(mctx, actx, &socketmgr);

lib/dns/dispatch.c

@@ -2468,7 +2468,7 @@ dns_dispatch_createtcp(dns_dispatchmgr_t *mgr, isc_socket_t *sock,
 
 	disp->ntasks = 1;
 	disp->task[0] = NULL;
-	result = isc_task_create(taskmgr, 50, &disp->task[0]);
+	result = isc_task_create(taskmgr, 0, &disp->task[0]);
 	if (result != ISC_R_SUCCESS)
 		goto kill_socket;
 

lib/dns/tests/dnstest.c

@@ -109,7 +109,7 @@ create_managers(void) {
 	isc_result_t result;
 	ncpus = isc_os_ncpus();
 
-	CHECK(isc_taskmgr_create(mctx, ncpus, 0, &taskmgr));
+	CHECK(isc_taskmgr_create(mctx, ncpus, &taskmgr));
 	CHECK(isc_timermgr_create(mctx, &timermgr));
 	CHECK(isc_socketmgr_create(mctx, &socketmgr));
 	CHECK(isc_task_create(taskmgr, 0, &maintask));

lib/irs/context.c

@@ -104,7 +104,7 @@ ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp,
 	if (result != ISC_R_SUCCESS)
 		goto fail;
 
-	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp);
+	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, taskmgrp);
 	if (result != ISC_R_SUCCESS)
 		goto fail;
 

lib/isc/include/isc/task.h

@@ -631,11 +631,10 @@ isc_task_privilege(isc_task_t *task);
 
 isc_result_t
 isc_taskmgr_createinctx(isc_mem_t *mctx, isc_appctx_t *actx,
-			unsigned int workers, unsigned int default_quantum,
-			isc_taskmgr_t **managerp);
+			unsigned int workers, isc_taskmgr_t **managerp);
 isc_result_t
 isc_taskmgr_create(isc_mem_t *mctx, unsigned int workers,
-		   unsigned int default_quantum, isc_taskmgr_t **managerp);
+		   isc_taskmgr_t **managerp);
 /*%<
  * Create a new task manager.  isc_taskmgr_createinctx() also associates
  * the new manager with the specified application context.
@@ -648,10 +647,6 @@ isc_taskmgr_create(isc_mem_t *mctx, unsigned int workers,
  *	create 'workers' threads, but if at least one thread creation
  *	succeeds, isc_taskmgr_create() may return ISC_R_SUCCESS.
  *
- *\li	If 'default_quantum' is non-zero, then it will be used as the default
- *	quantum value when tasks are created.  If zero, then an implementation
- *	defined default quantum will be used.
- *
  * Requires:
  *
  *\li      'mctx' is a valid memory context.

lib/isc/task.c

@@ -134,6 +134,8 @@ struct isc__taskqueue {
 	isc_condition_t			work_available;
 	isc_thread_t			thread;
 	unsigned int			threadid;
+	unsigned int			tasks_waiting;
+	bool				running;
 	isc__taskmgr_t			*manager;
 };
 
@@ -145,13 +147,10 @@ struct isc__taskmgr {
 	isc_mutex_t			halt_lock;
 	isc_condition_t			halt_cond;
 	unsigned int			workers;
-	atomic_uint_fast32_t		tasks_running;
-	atomic_uint_fast32_t		tasks_ready;
 	atomic_uint_fast32_t		curq;
 	isc__taskqueue_t		*queues;
 
 	/* Locked by task manager lock. */
-	unsigned int			default_quantum;
 	LIST(isc__task_t)		tasks;
 	isc_taskmgrmode_t		mode;
 	bool				pause_requested;
@@ -176,7 +175,17 @@ void
 isc__taskmgr_resume(isc_taskmgr_t *manager0);
 
 
-#define DEFAULT_DEFAULT_QUANTUM		25
+/*
+ * Unless specified otherwise when creating task we  normally run
+ * DEFAULT_QUANTUM events from a task in a single worker loop.
+ * If there are more than CONGESTED_TASK_LIMIT tasks waiting in the same queue
+ * we switch to CONGESTED_QUANTUM tasks per loop.
+ */
+
+#define DEFAULT_QUANTUM			50
+#define CONGESTED_QUANTUM		5
+#define CONGESTED_TASK_LIMIT		2
+
 #define FINISHED(m)			((m)->exiting && EMPTY((m)->tasks))
 
 /*%
@@ -292,7 +301,7 @@ isc_task_create_bound(isc_taskmgr_t *manager0, unsigned int quantum,
 	INIT_LIST(task->events);
 	INIT_LIST(task->on_shutdown);
 	task->nevents = 0;
-	task->quantum = (quantum > 0) ? quantum : manager->default_quantum;
+	task->quantum = quantum;
 	task->flags = 0;
 	task->now = 0;
 	isc_time_settoepoch(&task->tnow);
@@ -932,6 +941,8 @@ pop_readyq(isc__taskmgr_t *manager, int c) {
 
 	if (task != NULL) {
 		DEQUEUE(manager->queues[c].ready_tasks, task, ready_link);
+		INSIST(manager->queues[c].tasks_waiting > 0);
+		manager->queues[c].tasks_waiting--;
 		if (ISC_LINK_LINKED(task, ready_priority_link)) {
 			DEQUEUE(manager->queues[c].ready_priority_tasks, task,
 				ready_priority_link);
@@ -950,12 +961,11 @@ pop_readyq(isc__taskmgr_t *manager, int c) {
 static inline void
 push_readyq(isc__taskmgr_t *manager, isc__task_t *task, int c) {
 	ENQUEUE(manager->queues[c].ready_tasks, task, ready_link);
+	manager->queues[c].tasks_waiting++;
 	if ((task->flags & TASK_F_PRIVILEGED) != 0) {
 		ENQUEUE(manager->queues[c].ready_priority_tasks, task,
 			ready_priority_link);
 	}
-	atomic_fetch_add_explicit(&manager->tasks_ready, 1,
-				  memory_order_acquire);
 }
 
 static void
@@ -1095,6 +1105,16 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 		task = pop_readyq(manager, threadid);
 		if (task != NULL) {
 			unsigned int dispatch_count = 0;
+			unsigned int quantum = task->quantum;
+			if (quantum == 0) {
+				if (manager->queues[threadid].tasks_waiting
+				    < CONGESTED_TASK_LIMIT)
+				{
+					quantum = DEFAULT_QUANTUM;
+				} else {
+					quantum = CONGESTED_QUANTUM;
+				}
+			}
 			bool done = false;
 			bool requeue = false;
 			bool finished = false;
@@ -1107,12 +1127,8 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 			 * have a task to do.  We must reacquire the queue
 			 * lock before exiting the 'if (task != NULL)' block.
 			 */
+			manager->queues[threadid].running = true;
 			UNLOCK(&manager->queues[threadid].lock);
-			RUNTIME_CHECK(
-			      atomic_fetch_sub_explicit(&manager->tasks_ready,
-						1, memory_order_release) > 0);
-			atomic_fetch_add_explicit(&manager->tasks_running, 1,
-						  memory_order_acquire);
 
 			LOCK(&task->lock);
 			INSIST(task->state == task_state_ready);
@@ -1201,7 +1217,7 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 					} else
 						task->state = task_state_idle;
 					done = true;
-				} else if (dispatch_count >= task->quantum) {
+				} else if (dispatch_count >= quantum) {
 					/*
 					 * Our quantum has expired, but
 					 * there is more work to be done.
@@ -1226,10 +1242,8 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 			if (finished)
 				task_finished(task);
 
-			RUNTIME_CHECK(
-			      atomic_fetch_sub_explicit(&manager->tasks_running,
-						1, memory_order_release) > 0);
 			LOCK(&manager->queues[threadid].lock);
+			manager->queues[threadid].running = false;
 			if (requeue) {
 				/*
 				 * We know we're awake, so we don't have
@@ -1256,13 +1270,14 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 
 		/*
 		 * If we are in privileged execution mode and there are no
-		 * tasks remaining on the current ready queue, then
-		 * we're stuck.  Automatically drop privileges at that
-		 * point and continue with the regular ready queue.
+		 * tasks remaining on the current ready queue, we need to check
+		 * if maybe we need to drop from privileged to normal mode.
+		 * This might seem too heavy with all the locking but
+		 * privileged mode is used only during startup and dropped
+		 * once - after that this code is never executed.
 		 */
 		if (manager->mode != isc_taskmgrmode_normal &&
-		    atomic_load_explicit(&manager->tasks_running,
-					 memory_order_acquire) == 0)
+		    empty_readyq(manager, threadid))
 		{
 			UNLOCK(&manager->queues[threadid].lock);
 			LOCK(&manager->lock);
@@ -1273,16 +1288,14 @@ dispatch(isc__taskmgr_t *manager, unsigned int threadid) {
 			 * we'll end up in a deadlock over queue locks.
 			 *
 			 */
-			if (manager->mode != isc_taskmgrmode_normal &&
-			    atomic_load_explicit(&manager->tasks_running,
-						 memory_order_acquire) == 0)
-			{
+			if (manager->mode != isc_taskmgrmode_normal) {
 				bool empty = true;
 				unsigned int i;
 				for (i = 0; i < manager->workers && empty; i++)
 				{
 					LOCK(&manager->queues[i].lock);
-					empty &= empty_readyq(manager, i);
+					empty &= empty_readyq(manager, i) &&
+						 !manager->queues[i].running;
 					UNLOCK(&manager->queues[i].lock);
 				}
 				if (empty) {
@@ -1343,7 +1356,7 @@ manager_free(isc__taskmgr_t *manager) {
 
 isc_result_t
 isc_taskmgr_create(isc_mem_t *mctx, unsigned int workers,
-		    unsigned int default_quantum, isc_taskmgr_t **managerp)
+		   isc_taskmgr_t **managerp)
 {
 	unsigned int i;
 	isc__taskmgr_t *manager;
@@ -1369,16 +1382,10 @@ isc_taskmgr_create(isc_mem_t *mctx, unsigned int workers,
 
 	manager->workers = workers;
 
-	if (default_quantum == 0) {
-		default_quantum = DEFAULT_DEFAULT_QUANTUM;
-	}
-	manager->default_quantum = default_quantum;
 	INIT_LIST(manager->tasks);
 	manager->queues = isc_mem_get(mctx, workers * sizeof(isc__taskqueue_t));
 	RUNTIME_CHECK(manager->queues != NULL);
 
-	manager->tasks_running = 0;
-	manager->tasks_ready = 0;
 	manager->curq = 0;
 	manager->exiting = false;
 	manager->excl = NULL;
@@ -1400,6 +1407,8 @@ isc_taskmgr_create(isc_mem_t *mctx, unsigned int workers,
 
 		manager->queues[i].manager = manager;
 		manager->queues[i].threadid = i;
+		manager->queues[i].tasks_waiting = 0;
+		manager->queues[i].running = false;
 		RUNTIME_CHECK(isc_thread_create(run, &manager->queues[i],
 						&manager->queues[i].thread)
 			      == ISC_R_SUCCESS);
@@ -1708,21 +1717,6 @@ isc_taskmgr_renderxml(isc_taskmgr_t *mgr0, xmlTextWriterPtr writer) {
 	TRY0(xmlTextWriterWriteFormatString(writer, "%d", mgr->workers));
 	TRY0(xmlTextWriterEndElement(writer)); /* worker-threads */
 
-	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "default-quantum"));
-	TRY0(xmlTextWriterWriteFormatString(writer, "%d",
-					    mgr->default_quantum));
-	TRY0(xmlTextWriterEndElement(writer)); /* default-quantum */
-
-	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "tasks-running"));
-	TRY0(xmlTextWriterWriteFormatString(writer, "%d",
-					    (int) mgr->tasks_running));
-	TRY0(xmlTextWriterEndElement(writer)); /* tasks-running */
-
-	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "tasks-ready"));
-	TRY0(xmlTextWriterWriteFormatString(writer, "%d",
-					    (int) mgr->tasks_ready));
-	TRY0(xmlTextWriterEndElement(writer)); /* tasks-ready */
-
 	TRY0(xmlTextWriterEndElement(writer)); /* thread-model */
 
 	TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "tasks"));
@@ -1809,18 +1803,6 @@ isc_taskmgr_renderjson(isc_taskmgr_t *mgr0, json_object *tasks) {
 	CHECKMEM(obj);
 	json_object_object_add(tasks, "worker-threads", obj);
 
-	obj = json_object_new_int(mgr->default_quantum);
-	CHECKMEM(obj);
-	json_object_object_add(tasks, "default-quantum", obj);
-
-	obj = json_object_new_int(mgr->tasks_running);
-	CHECKMEM(obj);
-	json_object_object_add(tasks, "tasks-running", obj);
-
-	obj = json_object_new_int(mgr->tasks_ready);
-	CHECKMEM(obj);
-	json_object_object_add(tasks, "tasks-ready", obj);
-
 	array = json_object_new_array();
 	CHECKMEM(array);
 
@@ -1885,13 +1867,11 @@ isc_taskmgr_renderjson(isc_taskmgr_t *mgr0, json_object *tasks) {
 
 isc_result_t
 isc_taskmgr_createinctx(isc_mem_t *mctx, isc_appctx_t *actx,
-			unsigned int workers, unsigned int default_quantum,
-			isc_taskmgr_t **managerp)
+			unsigned int workers, isc_taskmgr_t **managerp)
 {
 	isc_result_t result;
 
-	result = isc_taskmgr_create(mctx, workers, default_quantum,
-				       managerp);
+	result = isc_taskmgr_create(mctx, workers, managerp);
 
 	if (result == ISC_R_SUCCESS)
 		isc_appctx_settaskmgr(actx, *managerp);

lib/isc/tests/isctest.c

@@ -86,7 +86,7 @@ create_managers(unsigned int workers) {
 		workers = atoi(p);
 	}
 
-	CHECK(isc_taskmgr_create(mctx, workers, 0, &taskmgr));
+	CHECK(isc_taskmgr_create(mctx, workers, &taskmgr));
 	CHECK(isc_task_create(taskmgr, 0, &maintask));
 	isc_taskmgr_setexcltask(taskmgr, maintask);
 

lib/isc/tests/task_test.c

@@ -712,7 +712,7 @@ manytasks(void **state) {
 	result = isc_mem_create(0, 0, &mctx);
 	assert_int_equal(result, ISC_R_SUCCESS);
 
-	result = isc_taskmgr_create(mctx, 4, 0, &taskmgr);
+	result = isc_taskmgr_create(mctx, 4, &taskmgr);
 	assert_int_equal(result, ISC_R_SUCCESS);
 
 	done = false;

lib/ns/tests/nstest.c

@@ -182,7 +182,7 @@ create_managers(void) {
 	isc_event_t *event = NULL;
 	ncpus = isc_os_ncpus();
 
-	CHECK(isc_taskmgr_create(mctx, ncpus, 0, &taskmgr));
+	CHECK(isc_taskmgr_create(mctx, ncpus, &taskmgr));
 	CHECK(isc_task_create(taskmgr, 0, &maintask));
 	isc_taskmgr_setexcltask(taskmgr, maintask);
 	CHECK(isc_task_onshutdown(maintask, shutdown_managers, NULL));

lib/samples/nsprobe.c

@@ -226,7 +226,7 @@ ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp,
 	if (result != ISC_R_SUCCESS)
 		goto fail;
 
-	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp);
+	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, taskmgrp);
 	if (result != ISC_R_SUCCESS)
 		goto fail;
 

lib/samples/resolve.c

@@ -381,7 +381,7 @@ main(int argc, char *argv[]) {
 	result = isc_app_ctxstart(actx);
 	if (result != ISC_R_SUCCESS)
 		goto cleanup;
-	result = isc_taskmgr_createinctx(mctx, actx, 1, 0, &taskmgr);
+	result = isc_taskmgr_createinctx(mctx, actx, 1, &taskmgr);
 	if (result != ISC_R_SUCCESS)
 		goto cleanup;
 	result = isc_socketmgr_createinctx(mctx, actx, &socketmgr);

lib/samples/sample-async.c

@@ -108,7 +108,7 @@ ctxs_init(isc_mem_t **mctxp, isc_appctx_t **actxp,
 	if (result != ISC_R_SUCCESS)
 		goto fail;
 
-	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, 0, taskmgrp);
+	result = isc_taskmgr_createinctx(*mctxp, *actxp, 1, taskmgrp);
 	if (result != ISC_R_SUCCESS)
 		goto fail;