OS-5738 increase timers allowed per-process

Reviewed by: Ryan Zezeski <rpz@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Approved by: Jerry Jelinek <jerry.jelinek@joyent.com>

usr/src/test/os-tests/runfiles/default.run

@@ -48,6 +48,10 @@ tests = ['sigqueue_queue_size']
 user = root
 tests = ['sdevfs_eisdir']
 
+[/opt/os-tests/tests/timer]
+user = root
+tests = ['timer_limit']
+
 [/opt/os-tests/tests/tmpfs]
 user = root
 tests = ['tmpfs_badmount', 'tmpfs_enospc']

usr/src/test/os-tests/tests/Makefile

@@ -14,6 +14,6 @@
 # Copyright 2016 Joyent, Inc.
 #
 
-SUBDIRS = poll secflags sigqueue spoof-ras sdevfs tmpfs file-locking
+SUBDIRS = poll secflags sigqueue spoof-ras sdevfs timer tmpfs file-locking
 
 include $(SRC)/test/Makefile.com

usr/src/test/os-tests/tests/timer/Makefile

@@ -0,0 +1,50 @@
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+
+#
+# Copyright 2016 Joyent, Inc.
+#
+
+include $(SRC)/Makefile.master
+
+ROOTOPTPKG = $(ROOT)/opt/os-tests
+TESTDIR = $(ROOTOPTPKG)/tests/timer
+
+PROGS = timer_limit
+
+include $(SRC)/cmd/Makefile.cmd
+include $(SRC)/test/Makefile.com
+
+C99MODE = -xc99=%all
+
+
+CMDS = $(PROGS:%=$(TESTDIR)/%)
+$(CMDS) := FILEMODE = 0555
+
+all: $(PROGS)
+
+install: all $(CMDS)
+
+lint:
+
+clobber: clean
+	-$(RM) $(PROGS)
+
+clean:
+	-$(RM) *.o
+
+$(CMDS): $(TESTDIR) $(PROGS)
+
+$(TESTDIR):
+	$(INS.dir)
+
+$(TESTDIR)/%: %
+	$(INS.file)

usr/src/test/os-tests/tests/timer/timer_limit.c

@@ -0,0 +1,83 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright 2016 Joyent, Inc.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <time.h>
+#include <limits.h>
+#include <assert.h>
+#include <sys/sysconfig.h>
+#include <sys/sysmacros.h>
+
+/* Need direct access to _sysconfig to query NCPU */
+extern long _sysconfig(int);
+
+
+static int
+mktimer(timer_t *timer)
+{
+	struct sigevent sev;
+	sev.sigev_notify = SIGEV_SIGNAL;
+	sev.sigev_signo = SIGRTMIN;
+	sev.sigev_value.sival_ptr = timer;
+
+	return (timer_create(CLOCK_MONOTONIC, &sev, timer));
+}
+
+int
+main()
+{
+	long ncpu;
+	size_t limit;
+	timer_t *timers, timer_overage;
+
+	/* Query NCPU with private sysconfig param */
+	ncpu = _sysconfig(_CONFIG_NPROC_NCPU);
+	assert(ncpu > 0 && ncpu < INT32_MAX);
+
+	/* Current specified limit is 4 * NCPU */
+	limit = 4 * ncpu;
+	timers = calloc(limit + 1, sizeof (timer_t));
+	assert(timers != NULL);
+
+	/* Slowly walk up to the limit doing creations/deletions */
+	for (int i = 1; i <= limit; i = MIN(limit, i*2)) {
+		for (int j = 0; j < i; j++) {
+			assert(mktimer(&timers[j]) == 0);
+		}
+
+		/*
+		 * Attempt to allocate one additional timer if we've reached
+		 * the assumed limit.
+		 */
+		if (i == limit) {
+			assert(mktimer(&timer_overage) == -1);
+		}
+
+		for (int j = 0; j < i; j++) {
+			assert(timer_delete(timers[j]) == 0);
+		}
+
+		/* Bail out if we've finished at the limit */
+		if (i == limit)
+			break;
+	}
+
+
+	return (0);
+}