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migration: introduce icount field for snapshots

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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.
This patch also updates snapshot test which verifies qemu monitor output.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Kevin Wolf <kwolf@redhat.com>

--

v4 changes:
 - squashed format update with test output update
v7 changes:
 - introduced the spaces between the fields in snapshot info output
 - updated the test to match new field widths
Message-Id: <160174518865.12451.14327573383978752463.stgit@pasha-ThinkPad-X280>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2020-10-03 20:13:08 +03:00 • committed by Paolo Bonzini
parent bbacffc5f7
commit b39847a505
9 changed files with 71 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

18
block/qapi.c
View file

@ -230,6 +230,8 @@ 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;
@ -694,14 +696,15 @@ BlockStatsList *qmp_query_blockstats(bool has_query_nodes,
void bdrv_snapshot_dump(QEMUSnapshotInfo *sn)
{
char date_buf[128], clock_buf[128];
char icount_buf[128] = {0};
struct tm tm;
time_t ti;
int64_t secs;
char *sizing = NULL;
if (!sn) {
qemu_printf("%-10s%-20s%11s%20s%15s",
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
qemu_printf("%-10s%-18s%7s%20s%13s%11s",
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK", "ICOUNT");
} else {
ti = sn->date_sec;
localtime_r(&ti, &tm);
@ -715,11 +718,16 @@ void bdrv_snapshot_dump(QEMUSnapshotInfo *sn)
(int)(secs % 60),
(int)((sn->vm_clock_nsec / 1000000) % 1000));
sizing = size_to_str(sn->vm_state_size);
qemu_printf("%-10s%-20s%11s%20s%15s",
if (sn->icount != -1ULL) {
snprintf(icount_buf, sizeof(icount_buf),
"%"PRId64, sn->icount);
}
qemu_printf("%-9s %-17s %7s%20s%13s%11s",
sn->id_str, sn->name,
sizing,
date_buf,
clock_buf);
clock_buf,
icount_buf);
}
g_free(sizing);
}
@ -881,6 +889,8 @@ void bdrv_image_info_dump(ImageInfo *info)
.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);