dtrace_vtime.c

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    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  * $FreeBSD$
   22  */
   23 
   24 /*
   25  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
   26  * Use is subject to license terms.
   27  */
   28 
   29 void
   30 dtrace_vtime_enable(void)
   31 {
   32         dtrace_vtime_state_t state, nstate = 0;
   33 
   34         do {
   35                 state = dtrace_vtime_active;
   36 
   37                 switch (state) {
   38                 case DTRACE_VTIME_INACTIVE:
   39                         nstate = DTRACE_VTIME_ACTIVE;
   40                         break;
   41 
   42                 case DTRACE_VTIME_INACTIVE_TNF:
   43                         nstate = DTRACE_VTIME_ACTIVE_TNF;
   44                         break;
   45 
   46                 case DTRACE_VTIME_ACTIVE:
   47                 case DTRACE_VTIME_ACTIVE_TNF:
   48                         panic("DTrace virtual time already enabled");
   49                         /*NOTREACHED*/
   50                 }
   51 
   52         } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
   53             state, nstate) != state);
   54 }
   55 
   56 void
   57 dtrace_vtime_disable(void)
   58 {
   59         dtrace_vtime_state_t state, nstate = 0;
   60 
   61         do {
   62                 state = dtrace_vtime_active;
   63 
   64                 switch (state) {
   65                 case DTRACE_VTIME_ACTIVE:
   66                         nstate = DTRACE_VTIME_INACTIVE;
   67                         break;
   68 
   69                 case DTRACE_VTIME_ACTIVE_TNF:
   70                         nstate = DTRACE_VTIME_INACTIVE_TNF;
   71                         break;
   72 
   73                 case DTRACE_VTIME_INACTIVE:
   74                 case DTRACE_VTIME_INACTIVE_TNF:
   75                         panic("DTrace virtual time already disabled");
   76                         /*NOTREACHED*/
   77                 }
   78 
   79         } while (dtrace_cas32((uint32_t *)&dtrace_vtime_active,
   80             state, nstate) != state);
   81 }
   82 
   83 void
   84 dtrace_vtime_switch(kthread_t *next)
   85 {
   86         dtrace_icookie_t cookie;
   87         hrtime_t ts;
   88 
   89         cookie = dtrace_interrupt_disable();
   90         ts = dtrace_gethrtime();
   91 
   92         if (curthread->t_dtrace_start != 0) {
   93                 curthread->t_dtrace_vtime += ts - curthread->t_dtrace_start;
   94                 curthread->t_dtrace_start = 0;
   95         }
   96 
   97         if (next != NULL)
   98                 next->t_dtrace_start = ts;
   99 
  100         dtrace_interrupt_enable(cookie);
  101 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/dev/dtrace/dtrace_vtime.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/dtrace/dtrace_vtime.c