[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH v4 09/10] Add the function of colo_bitmap_clear_diry.
From: |
leirao |
Subject: |
[PATCH v4 09/10] Add the function of colo_bitmap_clear_diry. |
Date: |
Thu, 25 Mar 2021 10:24:50 +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 a258466..ae1e659 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -855,6 +855,30 @@ 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)
@@ -3700,7 +3724,6 @@ 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() {
@@ -3722,9 +3745,7 @@ 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
- [PATCH v4 00/10] Fixed some bugs and optimized some codes for COLO, leirao, 2021/03/24
- [PATCH v4 01/10] Remove some duplicate trace code., leirao, 2021/03/24
- [PATCH v4 02/10] Fix the qemu crash when guest shutdown during checkpoint, leirao, 2021/03/24
- [PATCH v4 03/10] Optimize the function of filter_send, leirao, 2021/03/24
- [PATCH v4 04/10] Remove migrate_set_block_enabled in checkpoint, leirao, 2021/03/24
- [PATCH v4 05/10] Add a function named packet_new_nocopy for COLO., leirao, 2021/03/24
- [PATCH v4 06/10] Add the function of colo_compare_cleanup, leirao, 2021/03/24
- [PATCH v4 07/10] Reset the auto-converge counter at every checkpoint., leirao, 2021/03/24
- [PATCH v4 08/10] Reduce the PVM stop time during Checkpoint, leirao, 2021/03/24
- [PATCH v4 09/10] Add the function of colo_bitmap_clear_diry.,
leirao <=
- [PATCH v4 10/10] Fixed calculation error of pkt->header_size in fill_pkt_tcp_info(), leirao, 2021/03/24