Add heap profiling tests.

Fix a regression in prof_dump_ctx() due to an uninitized variable.  This
was caused by revision 4f37ef693e, so no
releases are affected.

test/unit/prof_accum.c

@@ -0,0 +1,116 @@
+#include "test/jemalloc_test.h"
+
+#define	NTHREADS		4
+#define	NALLOCS_PER_THREAD	50
+#define	DUMP_INTERVAL		1
+#define	BT_COUNT_CHECK_INTERVAL	5
+
+#ifdef JEMALLOC_PROF
+const char *malloc_conf =
+    "prof:true,prof_accum:true,prof_active:false,lg_prof_sample:0";
+#endif
+
+static int
+prof_dump_open_intercept(bool propagate_err, const char *filename)
+{
+	int fd;
+
+	fd = open("/dev/null", O_WRONLY);
+	assert_d_ne(fd, -1, "Unexpected open() failure");
+
+	return (fd);
+}
+
+#define	alloc_n_proto(n)						\
+static void	*alloc_##n(unsigned bits);
+
+#define	alloc_n_gen(n)							\
+static void *								\
+alloc_##n(unsigned bits)						\
+{									\
+									\
+	if (bits == 0) {						\
+		void *p = mallocx(1, 0);				\
+		assert_ptr_not_null(p, "Unexpected mallocx() failure");	\
+		return (p);						\
+	}								\
+									\
+	switch (bits & 0x1U) {						\
+	case 0: return (alloc_0(bits >> 1));				\
+	case 1: return (alloc_1(bits >> 1));				\
+	default: not_reached();						\
+	}								\
+}
+alloc_n_proto(0)
+alloc_n_proto(1)
+alloc_n_gen(0)
+alloc_n_gen(1)
+
+static void *
+alloc_from_permuted_backtrace(unsigned thd_ind, unsigned iteration)
+{
+
+	return (alloc_0(thd_ind*NALLOCS_PER_THREAD + iteration));
+}
+
+static void *
+thd_start(void *varg)
+{
+	unsigned thd_ind = *(unsigned *)varg;
+	size_t bt_count_prev, bt_count;
+	unsigned i_prev, i;
+
+	i_prev = 0;
+	bt_count_prev = 0;
+	for (i = 0; i < NALLOCS_PER_THREAD; i++) {
+		void *p = alloc_from_permuted_backtrace(thd_ind, i);
+		dallocx(p, 0);
+		if (i % DUMP_INTERVAL == 0) {
+			assert_d_eq(mallctl("prof.dump", NULL, NULL, NULL, 0),
+			    0, "Unexpected error while dumping heap profile");
+		}
+
+		if (i % BT_COUNT_CHECK_INTERVAL == 0 ||
+		    i+1 == NALLOCS_PER_THREAD) {
+			bt_count = prof_bt_count();
+			assert_zu_le(bt_count_prev+(i-i_prev), bt_count,
+			    "Expected larger bactrace count increase");
+			i_prev = i;
+			bt_count_prev = bt_count;
+		}
+	}
+
+	return (NULL);
+}
+
+TEST_BEGIN(test_idump)
+{
+	bool active;
+	thd_t thds[NTHREADS];
+	unsigned thd_args[NTHREADS];
+	unsigned i;
+
+	test_skip_if(!config_prof);
+
+	active = true;
+	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
+	    0, "Unexpected mallctl failure while activating profiling");
+
+	prof_dump_open = prof_dump_open_intercept;
+
+	for (i = 0; i < NTHREADS; i++) {
+		thd_args[i] = i;
+		thd_create(&thds[i], thd_start, (void *)&thd_args[i]);
+	}
+	for (i = 0; i < NTHREADS; i++)
+		thd_join(thds[i], NULL);
+}
+TEST_END
+
+int
+main(void)
+{
+
+	return (test(
+	    test_idump));
+}

test/unit/prof_gdump.c

@@ -0,0 +1,56 @@
+#include "test/jemalloc_test.h"
+
+#ifdef JEMALLOC_PROF
+const char *malloc_conf = "prof:true,prof_active:false,prof_gdump:true";
+#endif
+
+static bool did_prof_dump_open;
+
+static int
+prof_dump_open_intercept(bool propagate_err, const char *filename)
+{
+	int fd;
+
+	did_prof_dump_open = true;
+
+	fd = open("/dev/null", O_WRONLY);
+	assert_d_ne(fd, -1, "Unexpected open() failure");
+
+	return (fd);
+}
+
+TEST_BEGIN(test_gdump)
+{
+	bool active;
+	void *p, *q;
+
+	test_skip_if(!config_prof);
+
+	active = true;
+	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
+	    0, "Unexpected mallctl failure while activating profiling");
+
+	prof_dump_open = prof_dump_open_intercept;
+
+	did_prof_dump_open = false;
+	p = mallocx(chunksize, 0);
+	assert_ptr_not_null(p, "Unexpected mallocx() failure");
+	assert_true(did_prof_dump_open, "Expected a profile dump");
+
+	did_prof_dump_open = false;
+	q = mallocx(chunksize, 0);
+	assert_ptr_not_null(q, "Unexpected mallocx() failure");
+	assert_true(did_prof_dump_open, "Expected a profile dump");
+
+	dallocx(p, 0);
+	dallocx(q, 0);
+}
+TEST_END
+
+int
+main(void)
+{
+
+	return (test(
+	    test_gdump));
+}

test/unit/prof_idump.c

@@ -0,0 +1,51 @@
+#include "test/jemalloc_test.h"
+
+#ifdef JEMALLOC_PROF
+const char *malloc_conf =
+    "prof:true,prof_accum:true,prof_active:false,lg_prof_sample:0,"
+    "lg_prof_interval:0";
+#endif
+
+static bool did_prof_dump_open;
+
+static int
+prof_dump_open_intercept(bool propagate_err, const char *filename)
+{
+	int fd;
+
+	did_prof_dump_open = true;
+
+	fd = open("/dev/null", O_WRONLY);
+	assert_d_ne(fd, -1, "Unexpected open() failure");
+
+	return (fd);
+}
+
+TEST_BEGIN(test_idump)
+{
+	bool active;
+	void *p;
+
+	test_skip_if(!config_prof);
+
+	active = true;
+	assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
+	    0, "Unexpected mallctl failure while activating profiling");
+
+	prof_dump_open = prof_dump_open_intercept;
+
+	did_prof_dump_open = false;
+	p = mallocx(1, 0);
+	assert_ptr_not_null(p, "Unexpected mallocx() failure");
+	dallocx(p, 0);
+	assert_true(did_prof_dump_open, "Expected a profile dump");
+}
+TEST_END
+
+int
+main(void)
+{
+
+	return (test(
+	    test_idump));
+}