The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/profile.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 
   27 /*
   28  * Copyright 1991 by Open Software Foundation,
   29  * Grenoble, FRANCE
   30  *
   31  *              All Rights Reserved
   32  * 
   33  *   Permission to use, copy, modify, and distribute this software and
   34  * its documentation for any purpose and without fee is hereby granted,
   35  * provided that the above copyright notice appears in all copies and
   36  * that both the copyright notice and this permission notice appear in
   37  * supporting documentation, and that the name of OSF or Open Software
   38  * Foundation not be used in advertising or publicity pertaining to
   39  * distribution of the software without specific, written prior
   40  * permission.
   41  * 
   42  *   OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
   43  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
   44  * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
   45  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
   46  * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
   47  * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
   48  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   49  */
   50 
   51 /*
   52  * HISTORY
   53  * $Log:        profile.c,v $
   54  * Revision 2.2  93/01/14  17:36:06  danner
   55  *      Updated argument casts for calls to assert_wait, thread_sleep and thread_wakeup.
   56  *      [93/01/12            danner]
   57  *      Proper spl typing. 64bit cleanup.
   58  *      [92/12/01            af]
   59  * 
   60  * Revision 2.1  91/09/26  04:48:09  bernadat
   61  * Created.
   62  * 
   63  * Profiling support
   64  * (Bernard Tabib & Andrei Danes @ gr.osf.org)
   65  */
   66 
   67 
   68 #include        <kern/thread.h>
   69 #include        <kern/queue.h>
   70 #include        <mach/profil.h>
   71 #include        <kern/sched_prim.h>
   72 #include        <ipc/ipc_space.h>
   73 
   74 extern vm_map_t kernel_map; /* can be discarded, defined in <vm/vm_kern.h> */
   75 
   76 thread_t profile_thread_id = THREAD_NULL;
   77 
   78 
   79 void profile_thread() 
   80 {
   81         struct message {
   82                 mach_msg_header_t       head;
   83                 mach_msg_type_t         type;
   84                 int                     arg[SIZE_PROF_BUFFER+1];
   85         } msg;
   86 
   87         register spl_t  s;
   88         buf_to_send_t   buf_entry;
   89         queue_entry_t   prof_queue_entry;
   90         prof_data_t     pbuf;
   91         simple_lock_t   lock;
   92         msg_return_t    mr;
   93         int             j;
   94 
   95         /* Initialise the queue header for the prof_queue */
   96         mpqueue_init(&prof_queue);
   97 
   98         /* Template initialisation of header and type structures */
   99         msg.head.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, MACH_MSG_TYPE_MAKE_SEND_ONCE);
  100         msg.head.msgh_size = sizeof(msg); 
  101         msg.head.msgh_local_port = MACH_PORT_NULL;
  102         msg.head.msgh_kind = MACH_MSGH_KIND_NORMAL;
  103         msg.head.msgh_id = 666666;
  104         
  105         msg.type.msgt_name = MACH_MSG_TYPE_INTEGER_32;
  106         msg.type.msgt_size = 32;
  107         msg.type.msgt_number = SIZE_PROF_BUFFER+1;
  108         msg.type.msgt_inline = TRUE;
  109         msg.type.msgt_longform = FALSE;
  110         msg.type.msgt_deallocate = FALSE;
  111         msg.type.msgt_unused = 0;
  112 
  113         while (TRUE) {
  114 
  115            /* Dequeue the first buffer. */
  116            s = splsched();
  117            mpdequeue_head(&prof_queue, &prof_queue_entry);
  118            splx(s);
  119 
  120            if ((buf_entry = (buf_to_send_t) prof_queue_entry) == NULLBTS)
  121                 { 
  122                 thread_sleep((event_t) profile_thread, lock, TRUE);
  123                 if (current_thread()->wait_result != THREAD_AWAKENED)
  124                         break;
  125                 }
  126            else {
  127                 task_t          curr_task;
  128                 thread_t        curr_th;
  129                 register int    *sample;
  130                 int             curr_buf;
  131                 int             imax;
  132 
  133                 curr_th = (thread_t) buf_entry->thread;
  134                 curr_buf = (int) buf_entry->number; 
  135                 pbuf = curr_th->profil_buffer;
  136 
  137                 /* Set the remote port */
  138                 msg.head.msgh_remote_port = (mach_port_t) pbuf->prof_port;
  139 
  140                  
  141                 sample = pbuf->prof_area[curr_buf].p_zone;
  142                 imax = pbuf->prof_area[curr_buf].p_index;
  143                 for(j=0 ;j<imax; j++,sample++)
  144                 msg.arg[j] = *sample;   
  145 
  146                 /* Let hardclock() know you've finished the dirty job */
  147                 pbuf->prof_area[curr_buf].p_full = FALSE;
  148 
  149                 /*
  150                  * Store the number of samples actually sent 
  151                  * as the last element of the array.
  152                  */
  153                 msg.arg[SIZE_PROF_BUFFER] = imax;
  154 
  155                 mr = mach_msg(&(msg.head), MACH_SEND_MSG, 
  156                                     sizeof(struct message), 0, 
  157                                     MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, 
  158                                     MACH_PORT_NULL);
  159 
  160                 if (mr != MACH_MSG_SUCCESS) {
  161 printf("profile_thread: mach_msg failed returned %x\n",(int)mr);
  162                 }
  163 
  164                 if (buf_entry->wakeme)
  165                         thread_wakeup((event_t) &buf_entry->wakeme);
  166                 kmem_free(kernel_map, (buf_to_send_t) buf_entry,
  167                                         sizeof(struct buf_to_send));
  168 
  169             }
  170 
  171         }
  172         /* The profile thread has been signalled to exit.  There may still
  173            be sample data queued for us, which we must now throw away.
  174            Once we set profile_thread_id to null, hardclock() will stop
  175            queueing any additional samples, so we do not need to alter
  176            the interrupt level.  */
  177         profile_thread_id = THREAD_NULL;
  178         while (1) {
  179                 mpdequeue_head(&prof_queue, &prof_queue_entry);
  180                 if ((buf_entry = (buf_to_send_t) prof_queue_entry) == NULLBTS)
  181                         break;
  182                 if (buf_entry->wakeme)
  183                         thread_wakeup((event_t) &buf_entry->wakeme);
  184                 kmem_free(kernel_map, (buf_to_send_t) buf_entry,
  185                                         sizeof(struct buf_to_send));
  186         }
  187 
  188         thread_halt_self();
  189 }
  190 
  191 
  192 
  193 #include <mach/message.h>
  194 
  195 void
  196 send_last_sample_buf(th)
  197 thread_t th;
  198 {
  199         register        spl_t s;
  200         buf_to_send_t buf_entry;
  201         vm_offset_t vm_buf_entry;
  202 
  203         if (th->profil_buffer == NULLPBUF)
  204                 return;
  205 
  206         /* Ask for the sending of the last PC buffer.
  207          * Make a request to the profile_thread by inserting
  208          * the buffer in the send queue, and wake it up. 
  209          * The last buffer must be inserted at the head of the
  210          * send queue, so the profile_thread handles it immediatly. 
  211          */ 
  212         if (kmem_alloc( kernel_map, &vm_buf_entry,
  213                    sizeof(struct buf_to_send)) != KERN_SUCCESS)
  214                 return;
  215         buf_entry = (buf_to_send_t) vm_buf_entry;
  216         buf_entry->thread = (int *) th;
  217         buf_entry->number = th->profil_buffer->prof_index;
  218 
  219         /* Watch out in case profile thread exits while we are about to
  220            queue data for it.  */
  221         s = splsched();
  222         if (profile_thread_id != THREAD_NULL) {
  223                 simple_lock_t lock;
  224                 buf_entry->wakeme = 1;
  225                 mpenqueue_tail( &prof_queue, &(buf_entry->list));
  226                 thread_wakeup((event_t) profile_thread);
  227                 assert_wait((event_t) &buf_entry->wakeme, TRUE);
  228                 splx(s); 
  229                 thread_block((void (*)()) 0);
  230         } else {
  231                 splx(s);
  232                 kmem_free(kernel_map, vm_buf_entry, sizeof(struct buf_to_send));
  233         }
  234 }
  235 
  236 /*
  237  * Profile current thread
  238  */
  239 
  240 profile(pc) {
  241 
  242         /* Find out which thread has been interrupted. */
  243         thread_t it_thread = current_thread();
  244         int inout_val = pc; 
  245         buf_to_send_t   buf_entry;
  246         vm_offset_t     vm_buf_entry;
  247         int             *val;
  248         /*
  249          * Test if the current thread is to be sampled 
  250          */
  251         if (it_thread->thread_profiled) {
  252                 /* Inserts the PC value in the buffer of the thread */
  253                 set_pbuf_value(it_thread->profil_buffer, &inout_val); 
  254                 switch(inout_val) {
  255                 case 0: 
  256                         if (profile_thread_id == THREAD_NULL) {
  257                                 reset_pbuf_area(it_thread->profil_buffer);
  258                         } else printf("ERROR : hardclock : full buffer unsent\n");
  259                         break;
  260                 case 1: 
  261                         /* Normal case, value successfully inserted */
  262                         break;
  263                 case 2 : 
  264                         /*
  265                          * The value we have just inserted caused the
  266                          * buffer to be full, and ready to be sent.
  267                          * If profile_thread_id is null, the profile
  268                          * thread has been killed.  Since this generally
  269                          * happens only when the O/S server task of which
  270                          * it is a part is killed, it is not a great loss
  271                          * to throw away the data.
  272                          */
  273                         if (profile_thread_id == THREAD_NULL ||
  274                                 kmem_alloc(kernel_map,
  275                                            &vm_buf_entry ,
  276                                            sizeof(struct buf_to_send)) !=
  277                                 KERN_SUCCESS) {
  278                                 reset_pbuf_area(it_thread->profil_buffer);
  279                                 break;
  280                         }
  281                         buf_entry = (buf_to_send_t) vm_buf_entry;
  282                         buf_entry->thread = (int *)it_thread;
  283                         buf_entry->number =
  284                                 (it_thread->profil_buffer)->prof_index;
  285                         mpenqueue_tail(&prof_queue, &(buf_entry->list));
  286 
  287                         /* Switch to another buffer */
  288                         reset_pbuf_area(it_thread->profil_buffer);
  289 
  290                         /* Wake up the profile thread */
  291                         if (profile_thread_id != THREAD_NULL)
  292                                 thread_wakeup((event_t) profile_thread);
  293                         break;
  294 
  295                 default: 
  296                         printf("ERROR: profile : unexpected case\n"); 
  297                 }
  298         }
  299 }
  300 
  301 
  302 /* The task parameter in this and the subsequent routine is needed for
  303    MiG, even though it is not used in the function itself. */
  304 
  305 kern_return_t
  306 mach_sample_thread (task, reply, cur_thread)
  307 ipc_space_t     task;
  308 ipc_object_t    reply;
  309 thread_t        cur_thread;
  310 {
  311 /* 
  312  * This routine is called every time that a new thread has made
  313  * a request for the sampling service. We must keep track of the 
  314  * correspondance between it's identity (cur_thread) and the port
  315  * we are going to use as a reply port to send out the samples resulting 
  316  * from its execution. 
  317  */
  318         prof_data_t     pbuf;
  319         vm_offset_t     vmpbuf;
  320 
  321         if (reply != MACH_PORT_NULL) {
  322                 if (cur_thread->thread_profiled && cur_thread->thread_profiled_own) {
  323                         if (reply == cur_thread->profil_buffer->prof_port)
  324                                 return KERN_SUCCESS;
  325                         mach_sample_thread(MACH_PORT_NULL, cur_thread);
  326                 }
  327                 /* Start profiling this thread , do the initialization. */
  328                 alloc_pbuf_area(pbuf, vmpbuf);
  329                 if ((cur_thread->profil_buffer = pbuf) == NULLPBUF) {
  330 printf("ERROR:mach_sample_thread:cannot allocate pbuf\n");
  331                         return KERN_RESOURCE_SHORTAGE;
  332                 } else {
  333                         if (!set_pbuf_nb(pbuf, NB_PROF_BUFFER-1)) {
  334 printf("ERROR:mach_sample_thread:cannot set pbuf_nb\n");
  335                                 return KERN_FAILURE;
  336                         }
  337                         reset_pbuf_area(pbuf);
  338                 }
  339 
  340                 pbuf->prof_port = reply;
  341                 cur_thread->thread_profiled = TRUE;
  342                 cur_thread->thread_profiled_own     = TRUE;
  343                 if (profile_thread_id == THREAD_NULL)
  344                         profile_thread_id = kernel_thread(current_task(), profile_thread);
  345         } else {
  346                 if (!cur_thread->thread_profiled_own)
  347                         cur_thread->thread_profiled = FALSE;
  348                 if (!cur_thread->thread_profiled)
  349                         return KERN_SUCCESS;
  350 
  351                 send_last_sample_buf(cur_thread);
  352 
  353                 /* Stop profiling this thread, do the cleanup. */
  354 
  355                 cur_thread->thread_profiled_own     = FALSE;
  356                 cur_thread->thread_profiled = FALSE;
  357                 dealloc_pbuf_area(cur_thread->profil_buffer); 
  358                 cur_thread->profil_buffer = NULLPBUF;
  359         }
  360 
  361         return KERN_SUCCESS;
  362 }
  363 
  364 kern_return_t
  365 mach_sample_task (task, reply, cur_task)
  366 ipc_space_t     task;
  367 ipc_object_t    reply;
  368 task_t          cur_task;
  369 {
  370         prof_data_t     pbuf=cur_task->profil_buffer;
  371         vm_offset_t     vmpbuf;
  372         int             turnon = (reply != MACH_PORT_NULL);
  373 
  374         if (turnon) {
  375                 if (cur_task->task_profiled) {
  376                         if (cur_task->profil_buffer->prof_port == reply)
  377                                 return KERN_SUCCESS;
  378                         (void) mach_sample_task(task, MACH_PORT_NULL, cur_task);
  379                 }
  380                 if (pbuf == NULLPBUF) {
  381                         alloc_pbuf_area(pbuf, vmpbuf);
  382                         if (pbuf == NULLPBUF) {
  383                                 return KERN_RESOURCE_SHORTAGE;
  384                         }
  385                         cur_task->profil_buffer = pbuf;
  386                 }
  387                 if (!set_pbuf_nb(pbuf, NB_PROF_BUFFER-1)) {
  388                         return KERN_FAILURE;
  389                 }
  390                 reset_pbuf_area(pbuf);
  391                 pbuf->prof_port = reply;
  392         }
  393 
  394         if (turnon != cur_task->task_profiled) {
  395                 int actual,i,sentone;
  396                 thread_t thread;
  397 
  398                 if (turnon && profile_thread_id == THREAD_NULL)
  399                         profile_thread_id =
  400                                 kernel_thread(current_task(), profile_thread);
  401                 cur_task->task_profiled = turnon;  
  402                 actual = cur_task->thread_count; 
  403                 sentone = 0;
  404                 for (i=0, thread=(thread_t) queue_first(&cur_task->thread_list);
  405                      i < actual;
  406                      i++, thread=(thread_t) queue_next(&thread->thread_list)) {
  407                         if (!thread->thread_profiled_own) {
  408                                 thread->thread_profiled = turnon;
  409                                 if (turnon)
  410                                         thread->profil_buffer = cur_task->profil_buffer;
  411                                 else if (!sentone) {
  412                                         send_last_sample_buf(thread);
  413                                         sentone = 1;
  414                                 }
  415                         }
  416                 }
  417                 if (!turnon) {
  418                         dealloc_pbuf_area(pbuf); 
  419                         cur_task->profil_buffer = NULLPBUF;
  420                 }
  421         }
  422 
  423         return KERN_SUCCESS;
  424 }
  425 

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