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profile: better time breakdown and exclusion of idle cycles

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This commit is contained in:
Balazs Gerofi
2017-07-20 17:36:34 +09:00
parent 64c2e437c6
commit 992a292c08
5 changed files with 160 additions and 30 deletions
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38
kernel/syscall.c
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@@ -9307,9 +9307,6 @@ set_cputime(int mode)
long syscall(int num, ihk_mc_user_context_t *ctx)
{
long l;
#ifdef PROFILE_ENABLE
uint64_t t_s;
#endif // PROFILE_ENABLE
struct thread *thread = cpu_local_var(current);
#ifdef DISABLE_SCHED_YIELD
@@ -9317,6 +9314,14 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
#endif // DISABLE_SCHED_YIELD
set_cputime(1);
#ifdef PROFILE_ENABLE
if (thread->profile && thread->profile_start_ts) {
unsigned long ts = rdtsc();
thread->profile_elapsed_ts += (ts - thread->profile_start_ts);
thread->profile_start_ts = ts;
}
#endif // PROFILE_ENABLE
if(cpu_local_var(current)->proc->status == PS_EXITED &&
(num != __NR_exit && num != __NR_exit_group)){
check_signal(-EINVAL, NULL, 0);
@@ -9356,10 +9361,6 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
#endif
dkprintf("\n");
#ifdef PROFILE_ENABLE
t_s = rdtsc();
#endif // PROFILE_ENABLE
if ((0 <= num) && (num < (sizeof(syscall_table) / sizeof(syscall_table[0])))
&& (syscall_table[num] != NULL)) {
l = syscall_table[num](num, ctx);
@@ -9381,13 +9382,22 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
}
#ifdef PROFILE_ENABLE
if (num < PROFILE_SYSCALL_MAX) {
profile_event_add(num, (rdtsc() - t_s));
}
else {
if (num != __NR_profile) {
dkprintf("%s: syscall > %d ?? : %d\n",
__FUNCTION__, PROFILE_SYSCALL_MAX, num);
if (thread->profile) {
unsigned long ts = rdtsc();
/*
* futex_wait() and schedule() will internally reset
* thread->profile_start_ts so that actual wait time
* is not accounted for.
*/
if (num < PROFILE_SYSCALL_MAX) {
profile_event_add(num, (ts - thread->profile_start_ts));
}
else {
if (num != __NR_profile) {
dkprintf("%s: syscall > %d ?? : %d\n",
__FUNCTION__, PROFILE_SYSCALL_MAX, num);
}
}
}
#endif // PROFILE_ENABLE