vppinfra: add perf testing to test_vector_func

Type: improvement
Change-Id: I7aacd58d113c13036c15655817400032dd8d1932
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 243 insertions, 6 deletions

diff --git a/src/vppinfra/vector/test/test.c b/src/vppinfra/vector/test/test.c
index 1a8b9d6ea10..d098766481c 100644
--- a/src/vppinfra/vector/test/test.c
+++ b/src/vppinfra/vector/test/test.c
@@ -4,8 +4,9 @@
 
 #include <vppinfra/format.h>
 #include <vppinfra/vector/test/test.h>
+#include <vppinfra/error.h>
 
-test_registration_t *test_registrations[CLIB_MARCH_TYPE_N_VARIANTS] = {};
+test_main_t test_main;
 
 int
 test_march_supported (clib_march_variant_type_t type)
@@ -18,14 +19,12 @@ test_march_supported (clib_march_variant_type_t type)
     return 0;
 }
 
-int
-main (int argc, char *argv[])
+clib_error_t *
+test_funct (test_main_t *tm)
 {
-  clib_mem_init (0, 64ULL << 20);
-
   for (int i = 0; i < CLIB_MARCH_TYPE_N_VARIANTS; i++)
     {
-      test_registration_t *r = test_registrations[i];
+      test_registration_t *r = tm->registrations[i];
 
       if (r == 0 || test_march_supported (i) < 0)
 	continue;
@@ -51,3 +50,241 @@ main (int argc, char *argv[])
   fformat (stdout, "\n");
   return 0;
 }
+
+#define TEST_PERF_MAX_EVENTS 7
+typedef struct
+{
+  u64 config[TEST_PERF_MAX_EVENTS];
+  u8 n_events;
+  format_function_t *format_fn;
+} test_perf_event_bundle_t;
+
+static u8 *
+format_test_perf_bundle_default (u8 *s, va_list *args)
+{
+  test_perf_event_bundle_t __clib_unused *b =
+    va_arg (*args, test_perf_event_bundle_t *);
+  test_perf_t *tp = va_arg (*args, test_perf_t *);
+  u64 *data = va_arg (*args, u64 *);
+
+  if (data)
+    s = format (s, "%5.2f", (f64) data[1] / data[0]);
+  else
+    s = format (s, "%5s", "IPC");
+
+  if (data)
+    s = format (s, "%8.2f", (f64) data[0] / tp->n_ops);
+  else
+    s = format (s, "%8s", "Clks/Op");
+
+  if (data)
+    s = format (s, "%8.2f", (f64) data[1] / tp->n_ops);
+  else
+    s = format (s, "%8s", "Inst/Op");
+
+  if (data)
+    s = format (s, "%9.2f", (f64) data[2] / tp->n_ops);
+  else
+    s = format (s, "%9s", "Brnch/Op");
+
+  if (data)
+    s = format (s, "%10.2f", (f64) data[3] / tp->n_ops);
+  else
+    s = format (s, "%10s", "BrMiss/Op");
+  return s;
+}
+
+test_perf_event_bundle_t perf_bundles[] = { {
+  .config[0] = PERF_COUNT_HW_CPU_CYCLES,
+  .config[1] = PERF_COUNT_HW_INSTRUCTIONS,
+  .config[2] = PERF_COUNT_HW_BRANCH_INSTRUCTIONS,
+  .config[3] = PERF_COUNT_HW_BRANCH_MISSES,
+  .n_events = 4,
+  .format_fn = format_test_perf_bundle_default,
+} };
+
+#ifdef __linux__
+clib_error_t *
+test_perf (test_main_t *tm)
+{
+  clib_error_t *err = 0;
+  test_perf_event_bundle_t *b = perf_bundles;
+  int group_fd = -1, fds[TEST_PERF_MAX_EVENTS];
+  u64 count[TEST_PERF_MAX_EVENTS + 3] = {};
+  struct perf_event_attr pe = {
+    .size = sizeof (struct perf_event_attr),
+    .type = PERF_TYPE_HARDWARE,
+    .disabled = 1,
+    .exclude_kernel = 1,
+    .exclude_hv = 1,
+    .pinned = 1,
+    .exclusive = 1,
+    .read_format = (PERF_FORMAT_GROUP | PERF_FORMAT_TOTAL_TIME_ENABLED |
+		    PERF_FORMAT_TOTAL_TIME_RUNNING),
+  };
+
+  for (int i = 0; i < TEST_PERF_MAX_EVENTS; i++)
+    fds[i] = -1;
+
+  for (int i = 0; i < b->n_events; i++)
+    {
+      pe.config = b->config[i];
+      int fd = syscall (__NR_perf_event_open, &pe, /* pid */ 0, /* cpu */ -1,
+			/* group_fd */ group_fd, /* flags */ 0);
+      if (fd < 0)
+	{
+	  err = clib_error_return_unix (0, "perf_event_open");
+	  goto done;
+	}
+
+      if (group_fd == -1)
+	{
+	  group_fd = fd;
+	  pe.pinned = 0;
+	  pe.exclusive = 0;
+	}
+      fds[i] = fd;
+    }
+
+  for (int i = 0; i < CLIB_MARCH_TYPE_N_VARIANTS; i++)
+    {
+      test_registration_t *r = tm->registrations[i];
+
+      if (r == 0 || test_march_supported (i) < 0)
+	continue;
+
+      fformat (stdout, "\nMultiarch Variant: %U\n", format_march_variant, i);
+      fformat (stdout,
+	       "-------------------------------------------------------\n");
+      while (r)
+	{
+	  if (r->perf_tests)
+	    {
+	      test_perf_t *pt = r->perf_tests;
+	      fformat (stdout, "%-22s%-12s%U\n", r->name, "OpType",
+		       b->format_fn, b, pt, 0UL);
+	      do
+		{
+		  u32 read_size = (b->n_events + 3) * sizeof (u64);
+		  for (int i = 0; i < tm->repeat; i++)
+		    {
+		      test_perf_event_reset (group_fd);
+		      pt->fn (group_fd, pt);
+		      if ((read (group_fd, &count, read_size) != read_size))
+			{
+			  err = clib_error_return_unix (0, "read");
+			  goto done;
+			}
+		      if (count[1] != count[2])
+			clib_warning (
+			  "perf counters were not running all the time."
+#ifdef __x86_64__
+			  "\nConsider turning NMI watchdog off ('sysctl -w "
+			  "kernel.nmi_watchdog=0')."
+#endif
+			);
+		      fformat (stdout, "  %-20s%-12s%U\n", pt->name,
+			       pt->op_name ? pt->op_name : "", b->format_fn, b,
+			       pt, count + 3);
+		    }
+		}
+	      while ((++pt)->fn);
+	    }
+	  r = r->next;
+	}
+    }
+
+done:
+  for (int i = 0; i < TEST_PERF_MAX_EVENTS; i++)
+    if (fds[i] != -1)
+      close (fds[i]);
+  return err;
+}
+#endif
+
+int
+main (int argc, char *argv[])
+{
+  test_main_t *tm = &test_main;
+  unformat_input_t _i = {}, *i = &_i;
+  clib_mem_init (0, 64ULL << 20);
+  clib_error_t *err;
+  int perf = 0;
+
+  /* defaults */
+  tm->repeat = 3;
+
+  unformat_init_command_line (i, argv);
+
+  while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (i, "perf"))
+	perf = 1;
+      else if (unformat (i, "repeat %d", &tm->repeat))
+	;
+      else
+	{
+	  clib_warning ("unknown input '%U'", format_unformat_error, i);
+	  exit (1);
+	}
+    }
+
+  if (perf)
+    err = test_perf (tm);
+  else
+    err = test_funct (tm);
+
+  if (err)
+    {
+      clib_error_report (err);
+      fformat (stderr, "\n");
+      return 1;
+    }
+  return 0;
+}
+
+void *
+test_mem_alloc (uword size)
+{
+  void *rv;
+  size = round_pow2 (size, CLIB_CACHE_LINE_BYTES);
+  rv = clib_mem_alloc_aligned (size, CLIB_CACHE_LINE_BYTES);
+  clib_memset_u8 (rv, 0, size);
+  return rv;
+}
+
+void *
+test_mem_alloc_and_fill_inc_u8 (uword size, u8 start, u8 mask)
+{
+  u8 *rv;
+  mask = mask ? mask : 0xff;
+  size = round_pow2 (size, CLIB_CACHE_LINE_BYTES);
+  rv = clib_mem_alloc_aligned (size, CLIB_CACHE_LINE_BYTES);
+  for (uword i = 0; i < size; i++)
+    rv[i] = ((u8) i + start) & mask;
+  return rv;
+}
+
+void *
+test_mem_alloc_and_splat (uword elt_size, uword n_elts, void *elt)
+{
+  u8 *rv, *e;
+  uword data_size = elt_size * n_elts;
+  uword alloc_size = round_pow2 (data_size, CLIB_CACHE_LINE_BYTES);
+  e = rv = clib_mem_alloc_aligned (alloc_size, CLIB_CACHE_LINE_BYTES);
+  while (e - rv < data_size)
+    {
+      clib_memcpy_fast (e, elt, elt_size);
+      e += elt_size;
+    }
+
+  if (data_size < alloc_size)
+    clib_memset_u8 (e, 0, alloc_size - data_size);
+  return rv;
+}
+
+void
+test_mem_free (void *p)
+{
+  clib_mem_free (p);
+}