From: Hyman Huang(黄勇) <huangy81@xxxxxxxxxxxxxxx>
introduce dirty-bitmap mode as the third method of calc-dirty-rate.
implement dirty-bitmap dirtyrate calculation, which can be used
to measuring dirtyrate in the absence of dirty-ring.
introduce "dirty_bitmap:-b" option in hmp calc_dirty_rate to
indicate dirty bitmap method should be used for calculation.
Signed-off-by: Hyman Huang(黄勇) <huangy81@xxxxxxxxxxxxxxx>
Reviewed-by: Peter Xu <peterx@xxxxxxxxxx>
Reviewed-by: Juan Quintela <quintela@xxxxxxxxxx>
Signed-off-by: Juan Quintela <quintela@xxxxxxxxxx>
---
qapi/migration.json | 6 ++-
migration/dirtyrate.c | 112 ++++++++++++++++++++++++++++++++++++++----
hmp-commands.hx | 9 ++--
3 files changed, 112 insertions(+), 15 deletions(-)
diff --git a/qapi/migration.json b/qapi/migration.json
index fae4bc608c..87146ceea2 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1770,13 +1770,15 @@
#
# @page-sampling: calculate dirtyrate by sampling pages.
#
-# @dirty-ring: calculate dirtyrate by via dirty ring.
+# @dirty-ring: calculate dirtyrate by dirty ring.
+#
+# @dirty-bitmap: calculate dirtyrate by dirty bitmap.
#
# Since: 6.1
#
##
{ 'enum': 'DirtyRateMeasureMode',
- 'data': ['page-sampling', 'dirty-ring'] }
+ 'data': ['page-sampling', 'dirty-ring', 'dirty-bitmap'] }
##
# @DirtyRateInfo:
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 17b3d2cbb5..d65e744af9 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -15,6 +15,7 @@
#include "qapi/error.h"
#include "cpu.h"
#include "exec/ramblock.h"
+#include "exec/ram_addr.h"
#include "qemu/rcu_queue.h"
#include "qemu/main-loop.h"
#include "qapi/qapi-commands-migration.h"
@@ -118,6 +119,10 @@ static struct DirtyRateInfo *query_dirty_rate_info(void)
}
info->vcpu_dirty_rate = head;
}
+
+ if (dirtyrate_mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
+ info->sample_pages = 0;
+ }
}
trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState));
@@ -429,6 +434,79 @@ static int64_t do_calculate_dirtyrate_vcpu(DirtyPageRecord dirty_pages)
return memory_size_MB / time_s;
}
+static inline void record_dirtypages_bitmap(DirtyPageRecord *dirty_pages,
+ bool start)
+{
+ if (start) {
+ dirty_pages->start_pages = total_dirty_pages;
+ } else {
+ dirty_pages->end_pages = total_dirty_pages;
+ }
+}
+
+static void do_calculate_dirtyrate_bitmap(DirtyPageRecord dirty_pages)
+{
+ DirtyStat.dirty_rate = do_calculate_dirtyrate_vcpu(dirty_pages);
+}
+
+static inline void dirtyrate_manual_reset_protect(void)
+{
+ RAMBlock *block = NULL;
+
+ WITH_RCU_READ_LOCK_GUARD() {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ memory_region_clear_dirty_bitmap(block->mr, 0,
+ block->used_length);
+ }
+ }
+}
+
+static void calculate_dirtyrate_dirty_bitmap(struct DirtyRateConfig config)
+{
+ int64_t msec = 0;
+ int64_t start_time;
+ DirtyPageRecord dirty_pages;
+
+ qemu_mutex_lock_iothread();
+ memory_global_dirty_log_start(GLOBAL_DIRTY_DIRTY_RATE);
+
+ /*
+ * 1'round of log sync may return all 1 bits with
+ * KVM_DIRTY_LOG_INITIALLY_SET enable
+ * skip it unconditionally and start dirty tracking
+ * from 2'round of log sync
+ */
+ memory_global_dirty_log_sync();
+
+ /*
+ * reset page protect manually and unconditionally.
+ * this make sure kvm dirty log be cleared if
+ * KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE cap is enabled.
+ */
+ dirtyrate_manual_reset_protect();
+ qemu_mutex_unlock_iothread();
+
+ record_dirtypages_bitmap(&dirty_pages, true);
+
+ start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
+ DirtyStat.start_time = start_time / 1000;
+
+ msec = config.sample_period_seconds * 1000;
+ msec = set_sample_page_period(msec, start_time);
+ DirtyStat.calc_time = msec / 1000;
+
+ /*
+ * dirtyrate_global_dirty_log_stop do two things.
+ * 1. fetch dirty bitmap from kvm
+ * 2. stop dirty tracking
+ */
+ dirtyrate_global_dirty_log_stop();
+
+ record_dirtypages_bitmap(&dirty_pages, false);
+
+ do_calculate_dirtyrate_bitmap(dirty_pages);
+}
+
static void calculate_dirtyrate_dirty_ring(struct DirtyRateConfig config)
{
CPUState *cpu;
@@ -514,7 +592,9 @@ out:
static void calculate_dirtyrate(struct DirtyRateConfig config)
{
- if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
+ if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) {
+ calculate_dirtyrate_dirty_bitmap(config);
+ } else if (config.mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) {
calculate_dirtyrate_dirty_ring(config);
} else {
calculate_dirtyrate_sample_vm(config);
@@ -597,12 +677,15 @@ void qmp_calc_dirty_rate(int64_t calc_time,
/*
* dirty ring mode only works when kvm dirty ring is enabled.
+ * on the contrary, dirty bitmap mode is not.
*/
- if ((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) &&
- !kvm_dirty_ring_enabled()) {
- error_setg(errp, "dirty ring is disabled, use sample-pages method "
- "or remeasure later.");
- return;
+ if (((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) &&
+ !kvm_dirty_ring_enabled()) ||
+ ((mode == DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP) &&
+ kvm_dirty_ring_enabled())) {
+ error_setg(errp, "mode %s is not enabled, use other method instead.",
+ DirtyRateMeasureMode_str(mode));
+ return;
}
/*
@@ -678,9 +761,8 @@ void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict)
int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1);
bool has_sample_pages = (sample_pages != -1);
bool dirty_ring = qdict_get_try_bool(qdict, "dirty_ring", false);
- DirtyRateMeasureMode mode =
- (dirty_ring ? DIRTY_RATE_MEASURE_MODE_DIRTY_RING :
- DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING);
+ bool dirty_bitmap = qdict_get_try_bool(qdict, "dirty_bitmap", false);
+ DirtyRateMeasureMode mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING;
Error *err = NULL;
if (!sec) {
@@ -688,6 +770,18 @@ void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict)
return;
}
+ if (dirty_ring && dirty_bitmap) {
+ monitor_printf(mon, "Either dirty ring or dirty bitmap "
+ "can be specified!\n");
+ return;
+ }
+
+ if (dirty_bitmap) {
+ mode = DIRTY_RATE_MEASURE_MODE_DIRTY_BITMAP;
+ } else if (dirty_ring) {
+ mode = DIRTY_RATE_MEASURE_MODE_DIRTY_RING;
+ }
+
qmp_calc_dirty_rate(sec, has_sample_pages, sample_pages, true,
mode, &err);
if (err) {
diff --git a/hmp-commands.hx b/hmp-commands.hx
index b6d47bd03f..3a5aeba3fe 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1737,9 +1737,10 @@ ERST
{
.name = "calc_dirty_rate",
- .args_type = "dirty_ring:-r,second:l,sample_pages_per_GB:l?",
- .params = "[-r] second [sample_pages_per_GB]",
- .help = "start a round of guest dirty rate measurement (using -d to"
- "\n\t\t\t specify dirty ring as the method of calculation)",
+ .args_type = "dirty_ring:-r,dirty_bitmap:-b,second:l,sample_pages_per_GB:l?",
+ .params = "[-r] [-b] second [sample_pages_per_GB]",
+ .help = "start a round of guest dirty rate measurement (using -r to"
+ "\n\t\t\t specify dirty ring as the method of calculation and"
+ "\n\t\t\t -b to specify dirty bitmap as method of calculation)",
.cmd = hmp_calc_dirty_rate,
},
--
2.33.1
