87c576584d
- when profiling is compiled in kernel includes a 64M buffer for sample - 64M is the default used by profile tool as its buffer - when using nmi profiling it is not possible to always copy sample stright to userland as the nmi may (and does) happen in bad moments - reduces sampling overhead as samples are copied out only when profiling stops
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* The kernel call that is implemented in this file:
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* m_type: SYS_SPROFILE
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*
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* The parameters for this kernel call are:
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* m7_i1: PROF_ACTION (start/stop profiling)
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* m7_i2: PROF_MEM_SIZE (available memory for data)
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* m7_i3: PROF_FREQ (requested sample frequency)
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* m7_i4: PROF_ENDPT (endpoint of caller)
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* m7_p1: PROF_CTL_PTR (location of info struct)
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* m7_p2: PROF_MEM_PTR (location of memory for data)
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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 "kernel/system.h"
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#if SPROFILE
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/* user address to write info struct */
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PRIVATE vir_bytes sprof_info_addr_vir;
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PRIVATE clean_seen_flag(void)
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{
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int i;
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for (i = 0; i < NR_TASKS + NR_PROCS; i++)
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proc[i].p_misc_flags &= ~MF_SPROF_SEEN;
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}
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/*===========================================================================*
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* do_sprofile *
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*===========================================================================*/
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PUBLIC int do_sprofile(struct proc * caller, message * m_ptr)
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{
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int proc_nr;
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int err;
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switch(m_ptr->PROF_ACTION) {
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case PROF_START:
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/* Starting profiling.
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*
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* Check if profiling is not already running. Calculate physical
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* addresses of user pointers. Reset counters. Start CMOS timer.
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* Turn on profiling.
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*/
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if (sprofiling) {
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printf("SYSTEM: start s-profiling: already started\n");
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return EBUSY;
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}
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/* Test endpoint number. */
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if(!isokendpt(m_ptr->PROF_ENDPT, &proc_nr))
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return EINVAL;
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/* Set parameters for statistical profiler. */
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sprof_ep = m_ptr->PROF_ENDPT;
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sprof_info_addr_vir = (vir_bytes) m_ptr->PROF_CTL_PTR;
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sprof_data_addr_vir = (vir_bytes) m_ptr->PROF_MEM_PTR;
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sprof_info.mem_used = 0;
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sprof_info.total_samples = 0;
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sprof_info.idle_samples = 0;
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sprof_info.system_samples = 0;
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sprof_info.user_samples = 0;
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sprof_mem_size = m_ptr->PROF_MEM_SIZE < SAMPLE_BUFFER_SIZE ?
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m_ptr->PROF_MEM_SIZE : SAMPLE_BUFFER_SIZE;
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switch (sprofiling_type = m_ptr->PROF_INTR_TYPE) {
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case PROF_RTC:
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init_profile_clock(m_ptr->PROF_FREQ);
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break;
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case PROF_NMI:
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err = nmi_watchdog_start_profiling(m_ptr->PROF_FREQ);
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if (err)
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return err;
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break;
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default:
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printf("ERROR : unknown profiling interrupt type\n");
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return EINVAL;
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}
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sprofiling = 1;
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clean_seen_flag();
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return OK;
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case PROF_STOP:
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/* Stopping profiling.
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*
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* Check if profiling is indeed running. Turn off profiling.
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* Stop CMOS timer. Copy info struct to user process.
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*/
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if (!sprofiling) {
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printf("SYSTEM: stop s-profiling: not started\n");
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return EBUSY;
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}
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sprofiling = 0;
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switch (sprofiling_type) {
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case PROF_RTC:
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stop_profile_clock();
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break;
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case PROF_NMI:
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nmi_watchdog_stop_profiling();
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break;
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}
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data_copy(KERNEL, (vir_bytes) &sprof_info,
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sprof_ep, sprof_info_addr_vir, sizeof(sprof_info));
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data_copy(KERNEL, (vir_bytes) sprof_sample_buffer,
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sprof_ep, sprof_data_addr_vir, sprof_info.mem_used);
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clean_seen_flag();
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return OK;
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default:
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return EINVAL;
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}
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}
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#endif /* SPROFILE */
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