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profiler: Reenable built-in profiler

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2ed1ebcf6 "timer: replace time() with QEMU_CLOCK_HOST" broke compile
when configured with --enable-profiler. Turned out the profiler has been
broken for a while.

This does s/qemu_time/tcg_time/ as the profiler only works in a TCG mode.
This also fixes the compile error.

This changes profile_getclock() to return nanoseconds rather than
CPU ticks as the "profile" HMP command prints seconds and there is no
platform-independent way to get ticks-per-second rate.
Since TCG is quite slow and get_clock() returns nanoseconds (fine
enough), this should not affect precision much.

This removes unused qemu_time_start and tlb_flush_time.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <1426478258-29961-1-git-send-email-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2015-03-16 14:57:38 +11:00 committed by Paolo Bonzini
parent b680c5ba54
commit 89d5cbddee
3 changed files with 6 additions and 7 deletions
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2
cpus.c
View File

@ -1353,7 +1353,7 @@ static int tcg_cpu_exec(CPUArchState *env)
}
ret = cpu_exec(env);
#ifdef CONFIG_PROFILER
qemu_time += profile_getclock() - ti;
tcg_time += profile_getclock() - ti;
#endif
if (use_icount) {
/* Fold pending instructions back into the

5
include/qemu/timer.h
View File

@ -999,11 +999,10 @@ static inline int64_t cpu_get_real_ticks (void)
#ifdef CONFIG_PROFILER
static inline int64_t profile_getclock(void)
{
return cpu_get_real_ticks();
return get_clock();
}
extern int64_t qemu_time, qemu_time_start;
extern int64_t tlb_flush_time;
extern int64_t tcg_time;
extern int64_t dev_time;
#endif

6
monitor.c
View File

@ -1975,7 +1975,7 @@ static void hmp_info_numa(Monitor *mon, const QDict *qdict)
#ifdef CONFIG_PROFILER
int64_t qemu_time;
int64_t tcg_time;
int64_t dev_time;
static void hmp_info_profile(Monitor *mon, const QDict *qdict)
@ -1983,8 +1983,8 @@ static void hmp_info_profile(Monitor *mon, const QDict *qdict)
monitor_printf(mon, "async time %" PRId64 " (%0.3f)\n",
dev_time, dev_time / (double)get_ticks_per_sec());
monitor_printf(mon, "qemu time %" PRId64 " (%0.3f)\n",
qemu_time, qemu_time / (double)get_ticks_per_sec());
qemu_time = 0;
tcg_time, tcg_time / (double)get_ticks_per_sec());
tcg_time = 0;
dev_time = 0;
}
#else