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qemu-kvm/SOURCES/kvm-migration-Merge-ram_cou...

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From 5a87058eea6ee56f37fb454486c35baaf693d691 Mon Sep 17 00:00:00 2001
From: Juan Quintela <quintela@redhat.com>
Date: Wed, 22 Feb 2023 15:56:45 +0100
Subject: [PATCH 08/56] migration: Merge ram_counters and ram_atomic_counters
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Peter Xu <peterx@redhat.com>
RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
RH-Bugzilla: 2057267
RH-Acked-by: Leonardo Brás <leobras@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: quintela1 <quintela@redhat.com>
RH-Commit: [7/50] 90e395de66aa32b886cf151f7996a680190471f5 (peterx/qemu-kvm)
Using MgrationStats as type for ram_counters mean that we didn't have
to re-declare each value in another struct. The need of atomic
counters have make us to create MigrationAtomicStats for this atomic
counters.
Create RAMStats type which is a merge of MigrationStats and
MigrationAtomicStats removing unused members.
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
---
Fix typos found by David Edmondson
(cherry picked from commit abce5fa16d126ed085ccf8a5b3fe61a1efa20994)
Signed-off-by: Peter Xu <peterx@redhat.com>
---
migration/migration.c | 8 ++++----
migration/multifd.c | 4 ++--
migration/ram.c | 39 ++++++++++++++++-----------------------
migration/ram.h | 28 +++++++++++++++-------------
4 files changed, 37 insertions(+), 42 deletions(-)
diff --git a/migration/migration.c b/migration/migration.c
index 99f86bd6c2..a91704d35c 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1140,12 +1140,12 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
size_t page_size = qemu_target_page_size();
info->ram = g_malloc0(sizeof(*info->ram));
- info->ram->transferred = stat64_get(&ram_atomic_counters.transferred);
+ info->ram->transferred = stat64_get(&ram_counters.transferred);
info->ram->total = ram_bytes_total();
- info->ram->duplicate = stat64_get(&ram_atomic_counters.duplicate);
+ info->ram->duplicate = stat64_get(&ram_counters.duplicate);
/* legacy value. It is not used anymore */
info->ram->skipped = 0;
- info->ram->normal = stat64_get(&ram_atomic_counters.normal);
+ info->ram->normal = stat64_get(&ram_counters.normal);
info->ram->normal_bytes = info->ram->normal * page_size;
info->ram->mbps = s->mbps;
info->ram->dirty_sync_count = ram_counters.dirty_sync_count;
@@ -1157,7 +1157,7 @@ static void populate_ram_info(MigrationInfo *info, MigrationState *s)
info->ram->pages_per_second = s->pages_per_second;
info->ram->precopy_bytes = ram_counters.precopy_bytes;
info->ram->downtime_bytes = ram_counters.downtime_bytes;
- info->ram->postcopy_bytes = stat64_get(&ram_atomic_counters.postcopy_bytes);
+ info->ram->postcopy_bytes = stat64_get(&ram_counters.postcopy_bytes);
if (migrate_use_xbzrle()) {
info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
diff --git a/migration/multifd.c b/migration/multifd.c
index cbc0dfe39b..01fab01a92 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -433,7 +433,7 @@ static int multifd_send_pages(QEMUFile *f)
transferred = ((uint64_t) pages->num) * p->page_size + p->packet_len;
qemu_file_acct_rate_limit(f, transferred);
ram_counters.multifd_bytes += transferred;
- stat64_add(&ram_atomic_counters.transferred, transferred);
+ stat64_add(&ram_counters.transferred, transferred);
qemu_mutex_unlock(&p->mutex);
qemu_sem_post(&p->sem);
@@ -628,7 +628,7 @@ int multifd_send_sync_main(QEMUFile *f)
p->pending_job++;
qemu_file_acct_rate_limit(f, p->packet_len);
ram_counters.multifd_bytes += p->packet_len;
- stat64_add(&ram_atomic_counters.transferred, p->packet_len);
+ stat64_add(&ram_counters.transferred, p->packet_len);
qemu_mutex_unlock(&p->mutex);
qemu_sem_post(&p->sem);
}
diff --git a/migration/ram.c b/migration/ram.c
index 0e68099bf9..71320ed27a 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -458,25 +458,18 @@ uint64_t ram_bytes_remaining(void)
0;
}
-/*
- * NOTE: not all stats in ram_counters are used in reality. See comments
- * for struct MigrationAtomicStats. The ultimate result of ram migration
- * counters will be a merged version with both ram_counters and the atomic
- * fields in ram_atomic_counters.
- */
-MigrationStats ram_counters;
-MigrationAtomicStats ram_atomic_counters;
+RAMStats ram_counters;
void ram_transferred_add(uint64_t bytes)
{
if (runstate_is_running()) {
ram_counters.precopy_bytes += bytes;
} else if (migration_in_postcopy()) {
- stat64_add(&ram_atomic_counters.postcopy_bytes, bytes);
+ stat64_add(&ram_counters.postcopy_bytes, bytes);
} else {
ram_counters.downtime_bytes += bytes;
}
- stat64_add(&ram_atomic_counters.transferred, bytes);
+ stat64_add(&ram_counters.transferred, bytes);
}
void dirty_sync_missed_zero_copy(void)
@@ -756,7 +749,7 @@ void mig_throttle_counter_reset(void)
rs->time_last_bitmap_sync = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
rs->num_dirty_pages_period = 0;
- rs->bytes_xfer_prev = stat64_get(&ram_atomic_counters.transferred);
+ rs->bytes_xfer_prev = stat64_get(&ram_counters.transferred);
}
/**
@@ -1130,8 +1123,8 @@ uint64_t ram_pagesize_summary(void)
uint64_t ram_get_total_transferred_pages(void)
{
- return stat64_get(&ram_atomic_counters.normal) +
- stat64_get(&ram_atomic_counters.duplicate) +
+ return stat64_get(&ram_counters.normal) +
+ stat64_get(&ram_counters.duplicate) +
compression_counters.pages + xbzrle_counters.pages;
}
@@ -1192,7 +1185,7 @@ static void migration_trigger_throttle(RAMState *rs)
MigrationState *s = migrate_get_current();
uint64_t threshold = s->parameters.throttle_trigger_threshold;
uint64_t bytes_xfer_period =
- stat64_get(&ram_atomic_counters.transferred) - rs->bytes_xfer_prev;
+ stat64_get(&ram_counters.transferred) - rs->bytes_xfer_prev;
uint64_t bytes_dirty_period = rs->num_dirty_pages_period * TARGET_PAGE_SIZE;
uint64_t bytes_dirty_threshold = bytes_xfer_period * threshold / 100;
@@ -1255,7 +1248,7 @@ static void migration_bitmap_sync(RAMState *rs)
/* reset period counters */
rs->time_last_bitmap_sync = end_time;
rs->num_dirty_pages_period = 0;
- rs->bytes_xfer_prev = stat64_get(&ram_atomic_counters.transferred);
+ rs->bytes_xfer_prev = stat64_get(&ram_counters.transferred);
}
if (migrate_use_events()) {
qapi_event_send_migration_pass(ram_counters.dirty_sync_count);
@@ -1331,7 +1324,7 @@ static int save_zero_page(PageSearchStatus *pss, QEMUFile *f, RAMBlock *block,
int len = save_zero_page_to_file(pss, f, block, offset);
if (len) {
- stat64_add(&ram_atomic_counters.duplicate, 1);
+ stat64_add(&ram_counters.duplicate, 1);
ram_transferred_add(len);
return 1;
}
@@ -1368,9 +1361,9 @@ static bool control_save_page(PageSearchStatus *pss, RAMBlock *block,
}
if (bytes_xmit > 0) {
- stat64_add(&ram_atomic_counters.normal, 1);
+ stat64_add(&ram_counters.normal, 1);
} else if (bytes_xmit == 0) {
- stat64_add(&ram_atomic_counters.duplicate, 1);
+ stat64_add(&ram_counters.duplicate, 1);
}
return true;
@@ -1402,7 +1395,7 @@ static int save_normal_page(PageSearchStatus *pss, RAMBlock *block,
qemu_put_buffer(file, buf, TARGET_PAGE_SIZE);
}
ram_transferred_add(TARGET_PAGE_SIZE);
- stat64_add(&ram_atomic_counters.normal, 1);
+ stat64_add(&ram_counters.normal, 1);
return 1;
}
@@ -1458,7 +1451,7 @@ static int ram_save_multifd_page(QEMUFile *file, RAMBlock *block,
if (multifd_queue_page(file, block, offset) < 0) {
return -1;
}
- stat64_add(&ram_atomic_counters.normal, 1);
+ stat64_add(&ram_counters.normal, 1);
return 1;
}
@@ -1497,7 +1490,7 @@ update_compress_thread_counts(const CompressParam *param, int bytes_xmit)
ram_transferred_add(bytes_xmit);
if (param->zero_page) {
- stat64_add(&ram_atomic_counters.duplicate, 1);
+ stat64_add(&ram_counters.duplicate, 1);
return;
}
@@ -2632,9 +2625,9 @@ void acct_update_position(QEMUFile *f, size_t size, bool zero)
uint64_t pages = size / TARGET_PAGE_SIZE;
if (zero) {
- stat64_add(&ram_atomic_counters.duplicate, pages);
+ stat64_add(&ram_counters.duplicate, pages);
} else {
- stat64_add(&ram_atomic_counters.normal, pages);
+ stat64_add(&ram_counters.normal, pages);
ram_transferred_add(size);
qemu_file_credit_transfer(f, size);
}
diff --git a/migration/ram.h b/migration/ram.h
index 81cbb0947c..7c026b5242 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -35,25 +35,27 @@
#include "qemu/stats64.h"
/*
- * These are the migration statistic counters that need to be updated using
- * atomic ops (can be accessed by more than one thread). Here since we
- * cannot modify MigrationStats directly to use Stat64 as it was defined in
- * the QAPI scheme, we define an internal structure to hold them, and we
- * propagate the real values when QMP queries happen.
- *
- * IOW, the corresponding fields within ram_counters on these specific
- * fields will be always zero and not being used at all; they're just
- * placeholders to make it QAPI-compatible.
+ * These are the ram migration statistic counters. It is loosely
+ * based on MigrationStats. We change to Stat64 any counter that
+ * needs to be updated using atomic ops (can be accessed by more than
+ * one thread).
*/
typedef struct {
- Stat64 transferred;
+ int64_t dirty_pages_rate;
+ int64_t dirty_sync_count;
+ uint64_t dirty_sync_missed_zero_copy;
+ uint64_t downtime_bytes;
Stat64 duplicate;
+ uint64_t multifd_bytes;
Stat64 normal;
Stat64 postcopy_bytes;
-} MigrationAtomicStats;
+ int64_t postcopy_requests;
+ uint64_t precopy_bytes;
+ int64_t remaining;
+ Stat64 transferred;
+} RAMStats;
-extern MigrationAtomicStats ram_atomic_counters;
-extern MigrationStats ram_counters;
+extern RAMStats ram_counters;
extern XBZRLECacheStats xbzrle_counters;
extern CompressionStats compression_counters;
--
2.39.1
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