kernel/profile.c

   1 /*
   2  * This file contains several functions and variables used for system
   3  * profiling.
   4  *
   5  * Statistical Profiling:
   6  *   The interrupt handler for profiling clock.
   7  *
   8  * Call Profiling:
   9  *   The table used for profiling data and a function to get its size.
  10  *
  11  *   The function used by kernelspace processes to register the locations
  12  *   of their control struct and profiling table.
  13  *
  14  * Changes:
  15  *   14 Aug, 2006   Created, (Rogier Meurs)
  16  */
  17
  18 #include <minix/config.h>
  19
  20 #if SPROFILE || CPROFILE
  21
  22 #include <minix/profile.h>
  23 #include <minix/portio.h>
  24 #include "kernel.h"
  25 #include "profile.h"
  26 #include "proc.h"
  27
  28 #endif
  29
  30 #if SPROFILE
  31
  32 #include <string.h>
  33
  34 /* Function prototype for the profiling clock handler. */
  35 FORWARD _PROTOTYPE( int profile_clock_handler, (irq_hook_t *hook) );
  36
  37 /* A hook for the profiling clock interrupt handler. */
  38 PRIVATE irq_hook_t profile_clock_hook;
  39
  40 /*===========================================================================*
  41  *                      init_profile_clock                                   *
  42  *===========================================================================*/
  43 PUBLIC void init_profile_clock(u32_t freq)
  44 {
  45   int r, irq;
  46
  47   intr_disable();
  48
  49   if((irq = arch_init_profile_clock(freq)) >= 0) {
  50         /* Register interrupt handler for statistical system profiling.  */
  51         profile_clock_hook.proc_nr_e = CLOCK;
  52         put_irq_handler(&profile_clock_hook, irq, profile_clock_handler);
  53         enable_irq(&profile_clock_hook);
  54   }
  55
  56   intr_enable();
  57 }
  58
  59 /*===========================================================================*
  60  *                      profile_clock_stop                                   *
  61  *===========================================================================*/
  62 PUBLIC void stop_profile_clock()
  63 {
  64   intr_disable();
  65   arch_stop_profile_clock();
  66   intr_enable();
  67
  68   /* Unregister interrupt handler. */
  69   disable_irq(&profile_clock_hook);
  70   rm_irq_handler(&profile_clock_hook);
  71 }
  72
  73 /*===========================================================================*
  74  *                      profile_clock_handler                           *
  75  *===========================================================================*/
  76 PRIVATE int profile_clock_handler(hook)
  77 irq_hook_t *hook;
  78 {
  79 /* This executes on every tick of the CMOS timer. */
  80
  81   /* Are we profiling, and profiling memory not full? */
  82   if (!sprofiling || sprof_info.mem_used == -1) return (1);
  83
  84   /* Check if enough memory available before writing sample. */
  85   if (sprof_info.mem_used + sizeof(sprof_info) > sprof_mem_size) {
  86         sprof_info.mem_used = -1;
  87         return(1);
  88   }
  89
  90   /* All is OK */
  91
  92   /* Idle process? */
  93   if (priv(proc_ptr)->s_proc_nr == IDLE) {
  94         sprof_info.idle_samples++;
  95   } else
  96   /* Runnable system process? */
  97   if (priv(proc_ptr)->s_flags & SYS_PROC && !proc_ptr->p_rts_flags) {
  98         /* Note: k_reenter is always 0 here. */
  99
 100         /* Store sample (process name and program counter). */
 101         phys_copy(vir2phys(proc_ptr->p_name),
 102                 (phys_bytes) (sprof_data_addr + sprof_info.mem_used),
 103                 (phys_bytes) strlen(proc_ptr->p_name));
 104
 105         phys_copy(vir2phys(&proc_ptr->p_reg.pc),
 106                 (phys_bytes) (sprof_data_addr+sprof_info.mem_used +
 107                                         sizeof(proc_ptr->p_name)),
 108                 (phys_bytes) sizeof(proc_ptr->p_reg.pc));
 109
 110         sprof_info.mem_used += sizeof(sprof_sample);
 111
 112         sprof_info.system_samples++;
 113   } else {
 114         /* User process. */
 115         sprof_info.user_samples++;
 116   }
 117
 118   sprof_info.total_samples++;
 119
 120   /* Acknowledge interrupt if necessary. */
 121   arch_ack_profile_clock();
 122
 123   return(1);                                    /* reenable interrupts */
 124 }
 125
 126 #endif /* SPROFILE */
 127
 128
 129 #if CPROFILE
 130
 131 /*
 132  * The following variables and functions are used by the procentry/
 133  * procentry syslib functions when linked with kernelspace processes.
 134  * For userspace processes, the same variables and function are defined
 135  * elsewhere. This enables different functionality and variable sizes,
 136  * which is needed is a few cases.
 137  */
 138
 139 /* A small table is declared for the kernelspace processes. */
 140 struct cprof_tbl_s cprof_tbl[CPROF_TABLE_SIZE_KERNEL];
 141
 142 /* Function that returns table size. */
 143 PUBLIC int profile_get_tbl_size(void)
 144 {
 145   return CPROF_TABLE_SIZE_KERNEL;
 146 }
 147
 148 /* Function that returns on which execution of procentry to announce. */
 149 PUBLIC int profile_get_announce(void)
 150 {
 151   return CPROF_ACCOUNCE_KERNEL;
 152 }
 153
 154 /*
 155  * The kernel "announces" its control struct and table locations
 156  * to itself through this function.
 157  */
 158 PUBLIC void profile_register(ctl_ptr, tbl_ptr)
 159 void *ctl_ptr;
 160 void *tbl_ptr;
 161 {
 162   int len, proc_nr;
 163   vir_bytes vir_dst;
 164   struct proc *rp;
 165
 166   /* Store process name, control struct, table locations. */
 167   proc_nr = KERNEL;
 168   rp = proc_addr(proc_nr);
 169
 170   cprof_proc_info[cprof_procs_no].endpt = rp->p_endpoint;
 171   cprof_proc_info[cprof_procs_no].name = rp->p_name;
 172
 173   len = (phys_bytes) sizeof (void *);
 174
 175   vir_dst = (vir_bytes) ctl_ptr;
 176   cprof_proc_info[cprof_procs_no].ctl =
 177           numap_local(proc_nr, vir_dst, len);
 178
 179   vir_dst = (vir_bytes) tbl_ptr;
 180   cprof_proc_info[cprof_procs_no].buf =
 181           numap_local(proc_nr, vir_dst, len);
 182
 183   cprof_procs_no++;
 184 }
 185
 186 #endif /* CPROFILE */
 187