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[PATCH v2 09/10] Add the function of colo_bitmap_clear_diry
From: |
leirao |
Subject: |
[PATCH v2 09/10] Add the function of colo_bitmap_clear_diry |
Date: |
Fri, 12 Mar 2021 13:03:02 +0800 |
From: "Rao, Lei" <lei.rao@intel.com>
When we use continuous dirty memory copy for flushing ram cache on
secondary VM, we can also clean up the bitmap of contiguous dirty
page memory. This also can reduce the VM stop time during checkpoint.
Signed-off-by: Lei Rao <lei.rao@intel.com>
---
migration/ram.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index b269637..008a26e 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -856,6 +856,30 @@ unsigned long colo_bitmap_find_dirty(RAMState *rs,
RAMBlock *rb,
return first;
}
+/**
+ * colo_bitmap_clear_dirty:when we flush ram cache to ram, we will use
+ * continuous memory copy, so we can also clean up the bitmap of contiguous
+ * dirty memory.
+ */
+static inline bool colo_bitmap_clear_dirty(RAMState *rs,
+ RAMBlock *rb,
+ unsigned long start,
+ unsigned long num)
+{
+ bool ret;
+ unsigned long i = 0;
+
+ qemu_mutex_lock(&rs->bitmap_mutex);
+ for (i = 0; i < num; i++) {
+ ret = test_and_clear_bit(start + i, rb->bmap);
+ if (ret) {
+ rs->migration_dirty_pages--;
+ }
+ }
+ qemu_mutex_unlock(&rs->bitmap_mutex);
+ return ret;
+}
+
static inline bool migration_bitmap_clear_dirty(RAMState *rs,
RAMBlock *rb,
unsigned long page)
@@ -3703,7 +3727,6 @@ void colo_flush_ram_cache(void)
void *src_host;
unsigned long offset = 0;
unsigned long num = 0;
- unsigned long i = 0;
memory_global_dirty_log_sync();
WITH_RCU_READ_LOCK_GUARD() {
@@ -3725,9 +3748,7 @@ void colo_flush_ram_cache(void)
num = 0;
block = QLIST_NEXT_RCU(block, next);
} else {
- for (i = 0; i < num; i++) {
- migration_bitmap_clear_dirty(ram_state, block, offset + i);
- }
+ colo_bitmap_clear_dirty(ram_state, block, offset, num);
dst_host = block->host
+ (((ram_addr_t)offset) << TARGET_PAGE_BITS);
src_host = block->colo_cache
--
1.8.3.1
- Re: [PATCH v2 04/10] Remove migrate_set_block_enabled in checkpoint, (continued)
- [PATCH v2 06/10] Add the function of colo_compare_cleanup, leirao, 2021/03/12
- [PATCH v2 07/10] Reset the auto-converge counter at every checkpoint., leirao, 2021/03/12
- [PATCH v2 08/10] Reduce the PVM stop time during Checkpoint, leirao, 2021/03/12
- [PATCH v2 09/10] Add the function of colo_bitmap_clear_diry,
leirao <=
- [PATCH v2 10/10] Fixed calculation error of pkt->header_size in fill_pkt_tcp_info(), leirao, 2021/03/12