1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 /* 27 * Copyright (c) 2012 by Delphix. All rights reserved. 28 */ 29 30 /* 31 * ASSERTION: 32 * Positive test for ring buffer policy. 33 * 34 * SECTION: Buffers and Buffering/ring Policy; 35 * Buffers and Buffering/Buffer Sizes; 36 * Options and Tunables/bufsize; 37 * Options and Tunables/bufpolicy 38 */ 39 40 /* 41 * We make some regrettable assumptions about the implementation in this 42 * test. First, we assume that each entry for the printf() of an int 43 * takes _exactly_ 16 bytes (4 bytes for the EPID, 8 bytes for the 44 * timestamp, 4 bytes for the payload). Second, we assume that by 45 * allocating storage for n + 1 records, we will get exactly n. Here is 46 * why: the final predicate that evaluates to false will reserve space 47 * that it won't use. This act of reservation will advance the wrapped 48 * offset. That record won't be subsequently used, but the wrapped 49 * offset has advanced. (And in this case, that old record is clobbered 50 * by the exit() anyway.) Thirdly: we rely on t_cpu/cpu_id. Finally: 51 * we rely on being able to run on the CPU that we first ran on. 52 */ 53 #pragma D option bufpolicy=ring 54 #pragma D option bufsize=80 55 #pragma D option quiet 56 57 int n; 58 59 BEGIN 60 { 61 cpuid = -1; 62 } 63 64 tick-10msec 65 /cpuid == -1/ 66 { 67 cpuid = curthread->t_cpu->cpu_id; 68 } 69 70 tick-10msec 71 /curthread->t_cpu->cpu_id == cpuid && n < 100/ 72 { 73 printf("%d\n", n++); 74 } 75 76 tick-10msec 77 /n == 100/ 78 { 79 exit(0); 80 } 81