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monitor: Add drift info to 'info jit' 

Show in 'info jit' the current delay between the host clock
and the guest clock. In addition, print the maximum advance
and delay of the guest compared to the host.

Signed-off-by: Sebastian Tanase <sebastian.tanase@openwide.fr>
Tested-by: Camille Bégué <camille.begue@openwide.fr>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sebastian Tanase 2014-07-25 11:56:33 +02:00 committed by Paolo Bonzini
parent 7f7bc144ed
commit 27498bef35
4 changed files with 30 additions and 0 deletions
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6
cpu-exec.c
View File

@ -105,6 +105,12 @@ static void init_delay_params(SyncClocks *sc,
sc->realtime_clock +
cpu_get_clock_offset();
sc->last_cpu_icount = cpu->icount_extra + cpu->icount_decr.u16.low;
if (sc->diff_clk < max_delay) {
max_delay = sc->diff_clk;
}
if (sc->diff_clk > max_advance) {
max_advance = sc->diff_clk;
}
/* Print every 2s max if the guest is late. We limit the number
of printed messages to NB_PRINT_MAX(currently 100) */

19
cpus.c
View File

@ -64,6 +64,8 @@
#endif /* CONFIG_LINUX */
static CPUState *next_cpu;
int64_t max_delay;
int64_t max_advance;
bool cpu_is_stopped(CPUState *cpu)
{
@ -1552,3 +1554,20 @@ void qmp_inject_nmi(Error **errp)
error_set(errp, QERR_UNSUPPORTED);
#endif
}
void dump_drift_info(FILE *f, fprintf_function cpu_fprintf)
{
if (!use_icount) {
return;
}
cpu_fprintf(f, "Host - Guest clock %"PRIi64" ms\n",
(cpu_get_clock() - cpu_get_icount())/SCALE_MS);
if (icount_align_option) {
cpu_fprintf(f, "Max guest delay %"PRIi64" ms\n", -max_delay/SCALE_MS);
cpu_fprintf(f, "Max guest advance %"PRIi64" ms\n", max_advance/SCALE_MS);
} else {
cpu_fprintf(f, "Max guest delay NA\n");
cpu_fprintf(f, "Max guest advance NA\n");
}
}

4
include/qemu-common.h
View File

@ -109,6 +109,10 @@ static inline char *realpath(const char *path, char *resolved_path)
void configure_icount(QemuOpts *opts, Error **errp);
extern int use_icount;
extern int icount_align_option;
/* drift information for info jit command */
extern int64_t max_delay;
extern int64_t max_advance;
void dump_drift_info(FILE *f, fprintf_function cpu_fprintf);
#include "qemu/osdep.h"
#include "qemu/bswap.h"

1
monitor.c
View File

@ -1047,6 +1047,7 @@ static void do_info_registers(Monitor *mon, const QDict *qdict)
static void do_info_jit(Monitor *mon, const QDict *qdict)
{
dump_exec_info((FILE *)mon, monitor_fprintf);
dump_drift_info((FILE *)mon, monitor_fprintf);
}
static void do_info_history(Monitor *mon, const QDict *qdict)