replay: simplify async event processing

This patch joins replay event id and async event id into single byte in the log.
It makes processing a bit faster and log a bit smaller.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

--

v2: minor enum fixes (suggested by Richard Henderson)
Message-Id: <165364838393.688121.8191379555130516329.stgit@pasha-ThinkPad-X280>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
master
Pavel Dovgalyuk 8 months ago committed by Paolo Bonzini
parent 60618e2d77
commit 3e21408b05
  1. 36
      replay/replay-events.c
  2. 31
      replay/replay-internal.h
  3. 1
      replay/replay-snapshot.c
  4. 5
      replay/replay.c

@ -174,8 +174,8 @@ static void replay_save_event(Event *event)
{
if (replay_mode != REPLAY_MODE_PLAY) {
/* put the event into the file */
replay_put_event(EVENT_ASYNC);
replay_put_byte(event->event_kind);
g_assert(event->event_kind < REPLAY_ASYNC_COUNT);
replay_put_event(EVENT_ASYNC + event->event_kind);
/* save event-specific data */
switch (event->event_kind) {
@ -220,14 +220,10 @@ void replay_save_events(void)
static Event *replay_read_event(void)
{
Event *event;
if (replay_state.read_event_kind == -1) {
replay_state.read_event_kind = replay_get_byte();
replay_state.read_event_id = -1;
replay_check_error();
}
ReplayAsyncEventKind event_kind = replay_state.data_kind - EVENT_ASYNC;
/* Events that has not to be in the queue */
switch (replay_state.read_event_kind) {
switch (event_kind) {
case REPLAY_ASYNC_EVENT_BH:
case REPLAY_ASYNC_EVENT_BH_ONESHOT:
if (replay_state.read_event_id == -1) {
@ -236,17 +232,17 @@ static Event *replay_read_event(void)
break;
case REPLAY_ASYNC_EVENT_INPUT:
event = g_new0(Event, 1);
event->event_kind = replay_state.read_event_kind;
event->event_kind = event_kind;
event->opaque = replay_read_input_event();
return event;
case REPLAY_ASYNC_EVENT_INPUT_SYNC:
event = g_new0(Event, 1);
event->event_kind = replay_state.read_event_kind;
event->event_kind = event_kind;
event->opaque = 0;
return event;
case REPLAY_ASYNC_EVENT_CHAR_READ:
event = g_new0(Event, 1);
event->event_kind = replay_state.read_event_kind;
event->event_kind = event_kind;
event->opaque = replay_event_char_read_load();
return event;
case REPLAY_ASYNC_EVENT_BLOCK:
@ -256,18 +252,17 @@ static Event *replay_read_event(void)
break;
case REPLAY_ASYNC_EVENT_NET:
event = g_new0(Event, 1);
event->event_kind = replay_state.read_event_kind;
event->event_kind = event_kind;
event->opaque = replay_event_net_load();
return event;
default:
error_report("Unknown ID %d of replay event",
replay_state.read_event_kind);
error_report("Unknown ID %d of replay event", event_kind);
exit(1);
break;
}
QTAILQ_FOREACH(event, &events_list, events) {
if (event->event_kind == replay_state.read_event_kind
if (event->event_kind == event_kind
&& (replay_state.read_event_id == -1
|| replay_state.read_event_id == event->id)) {
break;
@ -276,12 +271,8 @@ static Event *replay_read_event(void)
if (event) {
QTAILQ_REMOVE(&events_list, event, events);
} else {
return NULL;
}
/* Read event-specific data */
return event;
}
@ -289,13 +280,14 @@ static Event *replay_read_event(void)
void replay_read_events(void)
{
g_assert(replay_mutex_locked());
while (replay_state.data_kind == EVENT_ASYNC) {
while (replay_state.data_kind >= EVENT_ASYNC
&& replay_state.data_kind <= EVENT_ASYNC_LAST) {
Event *event = replay_read_event();
if (!event) {
break;
}
replay_finish_event();
replay_state.read_event_kind = -1;
replay_state.read_event_id = -1;
replay_run_event(event);
g_free(event);
@ -304,7 +296,7 @@ void replay_read_events(void)
void replay_init_events(void)
{
replay_state.read_event_kind = -1;
replay_state.read_event_id = -1;
}
void replay_finish_events(void)

@ -12,6 +12,19 @@
*
*/
/* Asynchronous events IDs */
typedef enum ReplayAsyncEventKind {
REPLAY_ASYNC_EVENT_BH,
REPLAY_ASYNC_EVENT_BH_ONESHOT,
REPLAY_ASYNC_EVENT_INPUT,
REPLAY_ASYNC_EVENT_INPUT_SYNC,
REPLAY_ASYNC_EVENT_CHAR_READ,
REPLAY_ASYNC_EVENT_BLOCK,
REPLAY_ASYNC_EVENT_NET,
REPLAY_ASYNC_COUNT
} ReplayAsyncEventKind;
/* Any changes to order/number of events will need to bump REPLAY_VERSION */
enum ReplayEvents {
/* for instruction event */
@ -22,6 +35,7 @@ enum ReplayEvents {
EVENT_EXCEPTION,
/* for async events */
EVENT_ASYNC,
EVENT_ASYNC_LAST = EVENT_ASYNC + REPLAY_ASYNC_COUNT - 1,
/* for shutdown requests, range allows recovery of ShutdownCause */
EVENT_SHUTDOWN,
EVENT_SHUTDOWN_LAST = EVENT_SHUTDOWN + SHUTDOWN_CAUSE__MAX,
@ -49,21 +63,6 @@ enum ReplayEvents {
EVENT_COUNT
};
/* Asynchronous events IDs */
enum ReplayAsyncEventKind {
REPLAY_ASYNC_EVENT_BH,
REPLAY_ASYNC_EVENT_BH_ONESHOT,
REPLAY_ASYNC_EVENT_INPUT,
REPLAY_ASYNC_EVENT_INPUT_SYNC,
REPLAY_ASYNC_EVENT_CHAR_READ,
REPLAY_ASYNC_EVENT_BLOCK,
REPLAY_ASYNC_EVENT_NET,
REPLAY_ASYNC_COUNT
};
typedef enum ReplayAsyncEventKind ReplayAsyncEventKind;
typedef struct ReplayState {
/*! Cached clock values. */
int64_t cached_clock[REPLAY_CLOCK_COUNT];
@ -83,8 +82,6 @@ typedef struct ReplayState {
uint64_t block_request_id;
/*! Prior value of the host clock */
uint64_t host_clock_last;
/*! Asynchronous event type read from the log */
int32_t read_event_kind;
/*! Asynchronous event id read from the log */
uint64_t read_event_id;
} ReplayState;

@ -59,7 +59,6 @@ static const VMStateDescription vmstate_replay = {
VMSTATE_UINT32(has_unread_data, ReplayState),
VMSTATE_UINT64(file_offset, ReplayState),
VMSTATE_UINT64(block_request_id, ReplayState),
VMSTATE_INT32(read_event_kind, ReplayState),
VMSTATE_UINT64(read_event_id, ReplayState),
VMSTATE_END_OF_LIST()
},

@ -22,7 +22,7 @@
/* Current version of the replay mechanism.
Increase it when file format changes. */
#define REPLAY_VERSION 0xe0200b
#define REPLAY_VERSION 0xe0200c
/* Size of replay log header */
#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))
@ -221,7 +221,8 @@ bool replay_has_event(void)
replay_account_executed_instructions();
res = EVENT_CHECKPOINT <= replay_state.data_kind
&& replay_state.data_kind <= EVENT_CHECKPOINT_LAST;
res = res || replay_state.data_kind == EVENT_ASYNC;
res = res || (EVENT_ASYNC <= replay_state.data_kind
&& replay_state.data_kind <= EVENT_ASYNC_LAST);
}
return res;
}

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