174 lines
4.7 KiB
C
174 lines
4.7 KiB
C
/*
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* This file contains several functions and variables used for system
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* profiling.
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*
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* Statistical Profiling:
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* The interrupt handler for profiling clock.
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*
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* Call Profiling:
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* The table used for profiling data and a function to get its size.
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*
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* The function used by kernelspace processes to register the locations
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* of their control struct and profiling table.
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*
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* Changes:
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* 14 Aug, 2006 Created, (Rogier Meurs)
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*/
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#include <minix/config.h>
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#include <minix/profile.h>
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#include <minix/portio.h>
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#include "kernel.h"
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#include "profile.h"
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#include "proc.h"
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#if SPROFILE
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#include <string.h>
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/* Function prototype for the profiling clock handler. */
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FORWARD _PROTOTYPE( int profile_clock_handler, (irq_hook_t *hook) );
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/* A hook for the profiling clock interrupt handler. */
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PRIVATE irq_hook_t profile_clock_hook;
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/*===========================================================================*
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* init_profile_clock *
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*===========================================================================*/
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PUBLIC void init_profile_clock(u32_t freq)
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{
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int irq;
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intr_disable();
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if((irq = arch_init_profile_clock(freq)) >= 0) {
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/* Register interrupt handler for statistical system profiling. */
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profile_clock_hook.proc_nr_e = CLOCK;
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put_irq_handler(&profile_clock_hook, irq, profile_clock_handler);
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enable_irq(&profile_clock_hook);
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}
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intr_enable();
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}
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/*===========================================================================*
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* profile_clock_stop *
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*===========================================================================*/
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PUBLIC void stop_profile_clock()
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{
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intr_disable();
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arch_stop_profile_clock();
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intr_enable();
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/* Unregister interrupt handler. */
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disable_irq(&profile_clock_hook);
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rm_irq_handler(&profile_clock_hook);
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}
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/*===========================================================================*
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* profile_clock_handler *
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*===========================================================================*/
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PRIVATE int profile_clock_handler(hook)
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irq_hook_t *hook;
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{
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/* This executes on every tick of the CMOS timer. */
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/* Are we profiling, and profiling memory not full? */
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if (!sprofiling || sprof_info.mem_used == -1) return (1);
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/* Check if enough memory available before writing sample. */
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if (sprof_info.mem_used + sizeof(sprof_info) > sprof_mem_size) {
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sprof_info.mem_used = -1;
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return(1);
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}
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/* All is OK */
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/* Idle process? */
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if (priv(proc_ptr)->s_proc_nr == IDLE) {
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sprof_info.idle_samples++;
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} else
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/* Runnable system process? */
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if (priv(proc_ptr)->s_flags & SYS_PROC && proc_is_runnable(proc_ptr)) {
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/* Note: k_reenter is always 0 here. */
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/* Store sample (process name and program counter). */
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data_copy(SYSTEM, (vir_bytes) proc_ptr->p_name,
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sprof_ep, sprof_data_addr_vir + sprof_info.mem_used,
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strlen(proc_ptr->p_name));
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data_copy(SYSTEM, (vir_bytes) &proc_ptr->p_reg.pc, sprof_ep,
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(vir_bytes) (sprof_data_addr_vir + sprof_info.mem_used +
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sizeof(proc_ptr->p_name)),
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(vir_bytes) sizeof(proc_ptr->p_reg.pc));
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sprof_info.mem_used += sizeof(sprof_sample);
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sprof_info.system_samples++;
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} else {
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/* User process. */
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sprof_info.user_samples++;
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}
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sprof_info.total_samples++;
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/* Acknowledge interrupt if necessary. */
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arch_ack_profile_clock();
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return(1); /* reenable interrupts */
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}
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#endif /* SPROFILE */
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#if CPROFILE
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/*
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* The following variables and functions are used by the procentry/
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* procentry syslib functions when linked with kernelspace processes.
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* For userspace processes, the same variables and function are defined
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* elsewhere. This enables different functionality and variable sizes,
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* which is needed is a few cases.
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*/
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/* A small table is declared for the kernelspace processes. */
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struct cprof_tbl_s cprof_tbl[CPROF_TABLE_SIZE_KERNEL];
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/* Function that returns table size. */
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PUBLIC int profile_get_tbl_size(void)
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{
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return CPROF_TABLE_SIZE_KERNEL;
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}
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/* Function that returns on which execution of procentry to announce. */
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PUBLIC int profile_get_announce(void)
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{
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return CPROF_ACCOUNCE_KERNEL;
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}
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/*
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* The kernel "announces" its control struct and table locations
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* to itself through this function.
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*/
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PUBLIC void profile_register(ctl_ptr, tbl_ptr)
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void *ctl_ptr;
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void *tbl_ptr;
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{
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int proc_nr;
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vir_bytes vir_dst;
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struct proc *rp;
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if(cprof_procs_no >= NR_SYS_PROCS)
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return;
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/* Store process name, control struct, table locations. */
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rp = proc_addr(SYSTEM);
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cprof_proc_info[cprof_procs_no].endpt = rp->p_endpoint;
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cprof_proc_info[cprof_procs_no].name = rp->p_name;
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cprof_proc_info[cprof_procs_no].ctl_v = (vir_bytes) ctl_ptr;
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cprof_proc_info[cprof_procs_no].buf_v = (vir_bytes) tbl_ptr;
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cprof_procs_no++;
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}
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#endif
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