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8b42704441
This patch adds calls to replay functions into the icount setup block. In record mode number of executed instructions is written to the log. In replay mode number of istructions to execute is taken from the replay log. When replayed instructions counter is expired qemu_notify_event() function is called to wake up the iothread. Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20150917162405.8676.31890.stgit@PASHA-ISP.def.inno> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/*
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* replay.c
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*
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* Copyright (c) 2010-2015 Institute for System Programming
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* of the Russian Academy of Sciences.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "sysemu/replay.h"
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#include "replay-internal.h"
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#include "qemu/timer.h"
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#include "qemu/main-loop.h"
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ReplayMode replay_mode = REPLAY_MODE_NONE;
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ReplayState replay_state;
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bool replay_next_event_is(int event)
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{
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bool res = false;
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/* nothing to skip - not all instructions used */
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if (replay_state.instructions_count != 0) {
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assert(replay_data_kind == EVENT_INSTRUCTION);
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return event == EVENT_INSTRUCTION;
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}
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while (true) {
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if (event == replay_data_kind) {
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res = true;
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}
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switch (replay_data_kind) {
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default:
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/* clock, time_t, checkpoint and other events */
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return res;
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}
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}
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return res;
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}
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uint64_t replay_get_current_step(void)
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{
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return cpu_get_icount_raw();
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}
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int replay_get_instructions(void)
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{
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int res = 0;
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replay_mutex_lock();
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if (replay_next_event_is(EVENT_INSTRUCTION)) {
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res = replay_state.instructions_count;
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}
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replay_mutex_unlock();
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return res;
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}
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void replay_account_executed_instructions(void)
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{
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if (replay_mode == REPLAY_MODE_PLAY) {
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replay_mutex_lock();
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if (replay_state.instructions_count > 0) {
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int count = (int)(replay_get_current_step()
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- replay_state.current_step);
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replay_state.instructions_count -= count;
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replay_state.current_step += count;
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if (replay_state.instructions_count == 0) {
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assert(replay_data_kind == EVENT_INSTRUCTION);
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replay_finish_event();
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/* Wake up iothread. This is required because
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timers will not expire until clock counters
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will be read from the log. */
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qemu_notify_event();
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}
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}
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replay_mutex_unlock();
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}
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}
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