Initially int64_t was used, but on PowerPC architecture,
clang doesn't have atomic_*_8 function, so it produces
link time error.
QEMU is working with time as with 64bit value, but by
fact 32 bit is enough with CLOCK_REALTIME. In this case
blocktime will keep only 1200 hours time interval.
Signed-off-by: Alexey Perevalov <address@hidden>
Acked-by: Eric Blake <address@hidden>
---
hmp.c | 4 ++--
migration/postcopy-ram.c | 37 ++++++++++++++++++++-----------------
migration/trace-events | 4 ++--
qapi/migration.json | 4 ++--
4 files changed, 26 insertions(+), 23 deletions(-)
diff --git a/hmp.c b/hmp.c
index c6bab53..3c376b3 100644
--- a/hmp.c
+++ b/hmp.c
@@ -265,7 +265,7 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
}
if (info->has_postcopy_blocktime) {
- monitor_printf(mon, "postcopy blocktime: %" PRId64 "\n",
+ monitor_printf(mon, "postcopy blocktime: %u\n",
info->postcopy_blocktime);
}
@@ -273,7 +273,7 @@ void hmp_info_migrate(Monitor *mon, const QDict *qdict)
Visitor *v;
char *str;
v = string_output_visitor_new(false, &str);
- visit_type_int64List(v, NULL, &info->postcopy_vcpu_blocktime, NULL);
+ visit_type_uint32List(v, NULL, &info->postcopy_vcpu_blocktime, NULL);
visit_complete(v, &str);
monitor_printf(mon, "postcopy vcpu blocktime: %s\n", str);
g_free(str);
diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
index 7814da5..bd08c24 100644
--- a/migration/postcopy-ram.c
+++ b/migration/postcopy-ram.c
@@ -63,14 +63,14 @@ struct PostcopyDiscardState {
typedef struct PostcopyBlocktimeContext {
/* time when page fault initiated per vCPU */
- int64_t *page_fault_vcpu_time;
+ uint32_t *page_fault_vcpu_time;
/* page address per vCPU */
uintptr_t *vcpu_addr;
- int64_t total_blocktime;
+ uint32_t total_blocktime;
/* blocktime per vCPU */
- int64_t *vcpu_blocktime;
+ uint32_t *vcpu_blocktime;
/* point in time when last page fault was initiated */
- int64_t last_begin;
+ uint32_t last_begin;
/* number of vCPU are suspended */
int smp_cpus_down;
@@ -99,22 +99,22 @@ static void migration_exit_cb(Notifier *n, void *data)
static struct PostcopyBlocktimeContext *blocktime_context_new(void)
{
PostcopyBlocktimeContext *ctx = g_new0(PostcopyBlocktimeContext, 1);
- ctx->page_fault_vcpu_time = g_new0(int64_t, smp_cpus);
+ ctx->page_fault_vcpu_time = g_new0(uint32_t, smp_cpus);
ctx->vcpu_addr = g_new0(uintptr_t, smp_cpus);
- ctx->vcpu_blocktime = g_new0(int64_t, smp_cpus);
+ ctx->vcpu_blocktime = g_new0(uint32_t, smp_cpus);
ctx->exit_notifier.notify = migration_exit_cb;
qemu_add_exit_notifier(&ctx->exit_notifier);
return ctx;
}
-static int64List *get_vcpu_blocktime_list(PostcopyBlocktimeContext *ctx)
+static uint32List *get_vcpu_blocktime_list(PostcopyBlocktimeContext *ctx)
{
- int64List *list = NULL, *entry = NULL;
+ uint32List *list = NULL, *entry = NULL;
int i;
for (i = smp_cpus - 1; i >= 0; i--) {
- entry = g_new0(int64List, 1);
+ entry = g_new0(uint32List, 1);
entry->value = ctx->vcpu_blocktime[i];
entry->next = list;
list = entry;
@@ -145,7 +145,7 @@ void fill_destination_postcopy_migration_info(MigrationInfo
*info)
info->postcopy_vcpu_blocktime = get_vcpu_blocktime_list(bc);
}
-static uint64_t get_postcopy_total_blocktime(void)
+static uint32_t get_postcopy_total_blocktime(void)
{
MigrationIncomingState *mis = migration_incoming_get_current();
PostcopyBlocktimeContext *bc = mis->blocktime_ctx;
@@ -634,6 +634,7 @@ static void mark_postcopy_blocktime_begin(uintptr_t addr,
uint32_t ptid,
MigrationIncomingState *mis = migration_incoming_get_current();
PostcopyBlocktimeContext *dc = mis->blocktime_ctx;
int64_t now_ms;
+ uint32_t least_now;
if (!dc || ptid == 0) {
return;
@@ -644,13 +645,14 @@ static void mark_postcopy_blocktime_begin(uintptr_t addr,
uint32_t ptid,
}
now_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ least_now = (uint32_t)now_ms;
if (dc->vcpu_addr[cpu] == 0) {
atomic_inc(&dc->smp_cpus_down);
}
- atomic_xchg__nocheck(&dc->last_begin, now_ms);
- atomic_xchg__nocheck(&dc->page_fault_vcpu_time[cpu], now_ms);
- atomic_xchg__nocheck(&dc->vcpu_addr[cpu], addr);
+ atomic_xchg(&dc->last_begin, least_now);
+ atomic_xchg(&dc->page_fault_vcpu_time[cpu], least_now);
+ atomic_xchg(&dc->vcpu_addr[cpu], addr);
/* check it here, not at the begining of the function,
* due to, check could accur early than bitmap_set in
@@ -699,20 +701,21 @@ static void mark_postcopy_blocktime_end(uintptr_t addr)
int i, affected_cpu = 0;
int64_t now_ms;
bool vcpu_total_blocktime = false;
- int64_t read_vcpu_time;
+ uint32_t read_vcpu_time, least_now;
if (!dc) {
return;
}
now_ms = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ least_now = now_ms & 0xffffffff;