palacios/src/palacios/vmm_instrument.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2008, Jack Lange <jarusl@cs.northwestern.edu>
  11  * Copyright (c) 2008, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Chang Bae <c.s.bae@u.northwestern.edu>
  15  *
  16  * This is free software.  You are permitted to use,
  17  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  18  */
  19
  20 #ifdef INSTRUMENT_VMM
  21
  22 #include <palacios/svm_handler.h>
  23 #include <palacios/vmm_instrument.h>
  24
  25 #define NO_INSTRUMENTATION
  26 #include <palacios/vmm_ringbuffer.h>
  27 #undef NO_INSTRUMENTATION
  28
  29 #define RING_SIZE 2000
  30
  31 static ullong_t last = 0;
  32 static struct v3_ringbuf * func_ring = NULL;
  33
  34 struct instrumented_func {
  35     ullong_t time;
  36     uint_t exiting;
  37     void * called_fn;
  38     void * calling_fn;
  39 } __attribute__((packed));
  40
  41
  42
  43 static void print_instrumentation()  __attribute__((__no_instrument_function__));
  44
  45 void __cyg_profile_func_enter(void * this, void * callsite)   __attribute__((__no_instrument_function__));
  46 void __cyg_profile_func_exit(void * this, void * callsite)   __attribute__((__no_instrument_function__));
  47
  48 void v3_init_instrumentation() {
  49     PrintDebug("Creating Ring Buffer (unit size = %d)\n", (uint_t)sizeof(struct instrumented_func));
  50     // initialize
  51     func_ring = v3_create_ringbuf(sizeof(struct instrumented_func) * RING_SIZE); //dequeue at every 4095
  52 }
  53
  54
  55
  56 __attribute__((__no_instrument_function__))
  57     void __cyg_profile_func_enter(void * this, void * callsite) {
  58
  59     if (func_ring != NULL) {
  60
  61         struct instrumented_func tmp_fn;
  62         ullong_t now = 0;
  63
  64         rdtscll(now);
  65
  66         //PrintDebug("Entering Function\n");
  67
  68         if (v3_ringbuf_avail_space(func_ring) < sizeof(struct instrumented_func)) {
  69             print_instrumentation();
  70         }
  71
  72         tmp_fn.time = now - last; // current tsc
  73         tmp_fn.exiting = 0; //enter to be 0
  74         tmp_fn.called_fn = this; //this
  75         tmp_fn.calling_fn = callsite; //callsite
  76
  77         //    PrintDebug("Writing Function: fn_data=%p, size=%d\n",
  78         //       (void *)&tmp_fn, (uint_t)sizeof(struct instrumented_func));
  79         v3_ringbuf_write(func_ring, (uchar_t *)&tmp_fn, sizeof(struct instrumented_func));
  80
  81         rdtscll(last);
  82     }
  83 }
  84
  85
  86 __attribute__((__no_instrument_function__))
  87     void __cyg_profile_func_exit(void * this, void * callsite){
  88
  89     if (func_ring != NULL) {
  90
  91         struct instrumented_func tmp_fn;
  92         ullong_t now = 0;
  93
  94         rdtscll(now);
  95
  96         //    PrintDebug("Exiting Function\n");
  97
  98         if (v3_ringbuf_avail_space(func_ring) < sizeof(struct instrumented_func)) {
  99             print_instrumentation();
 100         }
 101
 102         tmp_fn.time = now - last; // current tsc
 103         tmp_fn.exiting = 1; //exit to be 0
 104         tmp_fn.called_fn = this; //this
 105         tmp_fn.calling_fn = callsite; //callsite
 106
 107         //    PrintDebug("Writing Function: fn_data=%p, size=%d\n",
 108         //       (void *)&tmp_fn, (uint_t)sizeof(struct instrumented_func));
 109         v3_ringbuf_write(func_ring, (uchar_t *)&tmp_fn, sizeof(struct instrumented_func));
 110
 111         rdtscll(last);
 112     }
 113 }
 114
 115
 116
 117 static void print_instrumentation() {
 118
 119     struct instrumented_func tmp_fn;
 120
 121     //  PrintDebug("Printing Instrumentation\n");
 122     while (v3_ringbuf_data_len(func_ring) >= sizeof(struct instrumented_func)) {
 123
 124         v3_ringbuf_read(func_ring, (uchar_t *)&tmp_fn, sizeof(struct instrumented_func));
 125
 126         PrintDebug("CYG_PROF: %d %p %p %p\n",
 127                    tmp_fn.exiting,
 128                    (void *)(addr_t)(tmp_fn.time),
 129                    tmp_fn.called_fn,
 130                    tmp_fn.calling_fn);
 131     }
 132 }
 133
 134
 135
 136 #endif