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[Qemu-devel] [PATCH v15 08/24] migration: introduce icount field for sna
From: |
Pavel Dovgalyuk |
Subject: |
[Qemu-devel] [PATCH v15 08/24] migration: introduce icount field for snapshots |
Date: |
Mon, 18 Mar 2019 12:28:10 +0300 |
User-agent: |
StGit/0.17.1-dirty |
Saving icount as a parameters of the snapshot allows navigation between
them in the execution replay scenario.
This information can be used for finding a specific snapshot for proceeding
the recorded execution to the specific moment of the time.
E.g., 'reverse step' action (introduced in one of the following patches)
needs to load the nearest snapshot which is prior to the current moment
of time .
Signed-off-by: Pavel Dovgalyuk <address@hidden>
Acked-by: Markus Armbruster <address@hidden>
--
v2:
- made icount in SnapshotInfo optional (suggested by Eric Blake)
v7:
- added more comments for icount member (suggested by Markus Armbruster)
v9:
- updated icount comment
v10:
- updated icount comment again
---
block/qapi.c | 18 ++++++++++++++----
block/qcow2-snapshot.c | 2 ++
blockdev.c | 10 ++++++++++
include/block/snapshot.h | 1 +
migration/savevm.c | 5 +++++
qapi/block-core.json | 7 ++++++-
qapi/block.json | 3 ++-
7 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/block/qapi.c b/block/qapi.c
index 21edab34fc..d2cdd99946 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -212,6 +212,8 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs,
info->date_nsec = sn_tab[i].date_nsec;
info->vm_clock_sec = sn_tab[i].vm_clock_nsec / 1000000000;
info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000;
+ info->icount = sn_tab[i].icount;
+ info->has_icount = sn_tab[i].icount != -1ULL;
info_list = g_new0(SnapshotInfoList, 1);
info_list->value = info;
@@ -664,14 +666,15 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf,
void *f,
QEMUSnapshotInfo *sn)
{
char buf1[128], date_buf[128], clock_buf[128];
+ char icount_buf[128] = {0};
struct tm tm;
time_t ti;
int64_t secs;
if (!sn) {
func_fprintf(f,
- "%-10s%-20s%7s%20s%15s",
- "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
+ "%-10s%-18s%7s%20s%13s%11s",
+ "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK", "ICOUNT");
} else {
ti = sn->date_sec;
localtime_r(&ti, &tm);
@@ -684,13 +687,18 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf,
void *f,
(int)((secs / 60) % 60),
(int)(secs % 60),
(int)((sn->vm_clock_nsec / 1000000) % 1000));
+ if (sn->icount != -1ULL) {
+ snprintf(icount_buf, sizeof(icount_buf),
+ "%"PRId64, sn->icount);
+ }
func_fprintf(f,
- "%-10s%-20s%7s%20s%15s",
+ "%-10s%-18s%7s%20s%13s%11s",
sn->id_str, sn->name,
get_human_readable_size(buf1, sizeof(buf1),
sn->vm_state_size),
date_buf,
- clock_buf);
+ clock_buf,
+ icount_buf);
}
}
@@ -858,6 +866,8 @@ void bdrv_image_info_dump(fprintf_function func_fprintf,
void *f,
.date_nsec = elem->value->date_nsec,
.vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL +
elem->value->vm_clock_nsec,
+ .icount = elem->value->has_icount ?
+ elem->value->icount : -1ULL,
};
pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id);
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 52b535425a..e358a7581c 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -378,6 +378,7 @@ int qcow2_snapshot_create(BlockDriverState *bs,
QEMUSnapshotInfo *sn_info)
sn->date_sec = sn_info->date_sec;
sn->date_nsec = sn_info->date_nsec;
sn->vm_clock_nsec = sn_info->vm_clock_nsec;
+ sn->icount = sn_info->icount;
/* Allocate the L1 table of the snapshot and copy the current one there. */
l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t));
@@ -709,6 +710,7 @@ int qcow2_snapshot_list(BlockDriverState *bs,
QEMUSnapshotInfo **psn_tab)
sn_info->date_sec = sn->date_sec;
sn_info->date_nsec = sn->date_nsec;
sn_info->vm_clock_nsec = sn->vm_clock_nsec;
+ sn_info->icount = sn->icount;
}
*psn_tab = sn_tab;
return s->nb_snapshots;
diff --git a/blockdev.c b/blockdev.c
index 53df2eb875..183fd3f7f6 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -57,6 +57,7 @@
#include "block/trace.h"
#include "sysemu/arch_init.h"
#include "sysemu/qtest.h"
+#include "sysemu/replay.h"
#include "qemu/cutils.h"
#include "qemu/help_option.h"
#include "qemu/throttle-options.h"
@@ -1241,6 +1242,10 @@ SnapshotInfo
*qmp_blockdev_snapshot_delete_internal_sync(const char *device,
info->vm_state_size = sn.vm_state_size;
info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
+ if (sn.icount != -1ULL) {
+ info->icount = sn.icount;
+ info->has_icount = true;
+ }
return info;
@@ -1448,6 +1453,11 @@ static void internal_snapshot_prepare(BlkActionState
*common,
sn->date_sec = tv.tv_sec;
sn->date_nsec = tv.tv_usec * 1000;
sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ if (replay_mode != REPLAY_MODE_NONE) {
+ sn->icount = replay_get_current_step();
+ } else {
+ sn->icount = -1ULL;
+ }
ret1 = bdrv_snapshot_create(bs, sn);
if (ret1 < 0) {
diff --git a/include/block/snapshot.h b/include/block/snapshot.h
index b5d5084a12..deeb24c22c 100644
--- a/include/block/snapshot.h
+++ b/include/block/snapshot.h
@@ -42,6 +42,7 @@ typedef struct QEMUSnapshotInfo {
uint32_t date_sec; /* UTC date of the snapshot */
uint32_t date_nsec;
uint64_t vm_clock_nsec; /* VM clock relative to boot */
+ uint64_t icount; /* record/replay step */
} QEMUSnapshotInfo;
int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info,
diff --git a/migration/savevm.c b/migration/savevm.c
index 1415001d1c..468a5a6c90 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -2596,6 +2596,11 @@ int save_snapshot(const char *name, Error **errp)
sn->date_sec = tv.tv_sec;
sn->date_nsec = tv.tv_usec * 1000;
sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ if (replay_mode != REPLAY_MODE_NONE) {
+ sn->icount = replay_get_current_step();
+ } else {
+ sn->icount = -1ULL;
+ }
if (name) {
ret = bdrv_snapshot_find(bs, old_sn, name);
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 12c5e73551..ecaf23bc2e 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -26,13 +26,18 @@
#
# @vm-clock-nsec: fractional part in nano seconds to be used with vm-clock-sec
#
+# @icount: Current instruction count. Appears when execution record/replay
+# is enabled. Used for "time-traveling" to match the moment
+# in the recorded execution with the snapshots. (since 4.0)
+#
# Since: 1.3
#
##
{ 'struct': 'SnapshotInfo',
'data': { 'id': 'str', 'name': 'str', 'vm-state-size': 'int',
'date-sec': 'int', 'date-nsec': 'int',
- 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int' } }
+ 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int',
+ '*icount': 'int' } }
##
# @ImageInfoSpecificQCow2EncryptionBase:
diff --git a/qapi/block.json b/qapi/block.json
index 145c268bb6..f389bb6f1a 100644
--- a/qapi/block.json
+++ b/qapi/block.json
@@ -176,7 +176,8 @@
# "date-sec": 1000012,
# "date-nsec": 10,
# "vm-clock-sec": 100,
-# "vm-clock-nsec": 20
+# "vm-clock-nsec": 20,
+# "icount": 220414
# }
# }
#
- [Qemu-devel] [PATCH v15 00/24] Fix record/replay and add reverse debugging, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 24/24] icount: clean up cpu_can_io before jumping to the next block, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 23/24] replay: rename step-related variables and functions, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 22/24] replay: fix replay shutdown, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 21/24] util/qemu-timer: refactor deadline calculation for external timers, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 20/24] replay: document development rules, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 18/24] replay: describe reverse debugging in docs/replay.txt, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 19/24] replay: add BH oneshot event for block layer, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 17/24] gdbstub: add reverse continue support in replay mode, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 11/24] replay: introduce info hmp/qmp command, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 08/24] migration: introduce icount field for snapshots,
Pavel Dovgalyuk <=
- [Qemu-devel] [PATCH v15 06/24] replay: finish record/replay before closing the disks, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 04/24] replay: update docs for record/replay with block devices, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 16/24] gdbstub: add reverse step support in replay mode, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 12/24] replay: introduce breakpoint at the specified step, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 13/24] replay: implement replay-seek command, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 15/24] replay: flush rr queue before loading the vmstate, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 14/24] replay: refine replay-time module, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 10/24] qapi: introduce replay.json for record/replay-related stuff, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 07/24] qcow2: introduce icount field for snapshots, Pavel Dovgalyuk, 2019/03/18
- [Qemu-devel] [PATCH v15 09/24] replay: provide an accessor for rr filename, Pavel Dovgalyuk, 2019/03/18