usr/src/cmd/dtrace/test/tst/common/pragma/tst.temporal3.d

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * This file and its contents are supplied under the terms of the
   5  * Common Development and Distribution License ("CDDL"), version 1.0.
   6  * You may only use this file in accordance with the terms of version
   7  * 1.0 of the CDDL.
   8  *
   9  * A full copy of the text of the CDDL should have accompanied this
  10  * source.  A copy of the CDDL is also available via the Internet at
  11  * http://www.illumos.org/license/CDDL.
  12  *
  13  * CDDL HEADER END
  14  */
  15
  16 /*
  17  * Copyright (c) 2012 by Delphix. All rights reserved.
  18  */
  19
  20 /*
  21  * This test excercises the "remnant" handling of the temporal option.
  22  * At the end of one pass of retrieving and printing data from all CPUs,
  23  * some unprocessed data will remain, because its timestamp is after the
  24  * time covered by all CPUs' buffers.  This unprocessed data is
  25  * rearranged in a more space-efficient manner.  If this is done
  26  * incorrectly, an alignment error may occur.  To test this, we use a
  27  * high-frequency probe so that data will be recorded in subsequent
  28  * CPU's buffers after the first CPU's buffer is obtained.  The
  29  * combination of data traced here (a 8-byte value and a 4-byte value)
  30  * is effective to cause alignment problems with an incorrect
  31  * implementation.
  32  *
  33  * This test needs to be run on a multi-CPU system to be effective.
  34  */
  35
  36 #pragma D option quiet
  37 #pragma D option temporal
  38
  39 profile-4997
  40 {
  41         printf("%u %u", 1ULL, 2);
  42 }
  43
  44 tick-1
  45 /i++ == 10/
  46 {
  47         exit(0);
  48 }