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[PATCH v6 08/12] migration/dirtyrate: skip sampling ramblock with size b
From: |
Chuan Zheng |
Subject: |
[PATCH v6 08/12] migration/dirtyrate: skip sampling ramblock with size below MIN_RAMBLOCK_SIZE |
Date: |
Sat, 29 Aug 2020 10:52:53 +0800 |
In order to sample real RAM, skip ramblock with size below MIN_RAMBLOCK_SIZE
which is set as 128M.
Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
---
migration/dirtyrate.c | 19 +++++++++++++++++++
migration/dirtyrate.h | 5 +++++
2 files changed, 24 insertions(+)
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 9cc2cbb..420fc59 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -164,6 +164,19 @@ alloc_ramblock_dirty_info(int *block_index,
return block_dinfo;
}
+static bool skip_sample_ramblock(RAMBlock *block)
+{
+ /*
+ * Consider ramblock with size larger than 128M is what we
+ * want to sample.
+ */
+ if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) {
+ return true;
+ }
+
+ return false;
+}
+
static int record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
struct DirtyRateConfig config,
int *block_index)
@@ -174,6 +187,9 @@ static int record_ramblock_hash_info(struct
RamblockDirtyInfo **block_dinfo,
int index = 0;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (skip_sample_ramblock(block)) {
+ continue;
+ }
dinfo = alloc_ramblock_dirty_info(&index, dinfo);
if (dinfo == NULL) {
return -1;
@@ -241,6 +257,9 @@ static int compare_page_hash_info(struct RamblockDirtyInfo
*info,
RAMBlock *block = NULL;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (skip_sample_ramblock(block)) {
+ continue;
+ }
block_dinfo = find_page_matched(block, block_index + 1, info);
if (block_dinfo == NULL) {
continue;
diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
index a3ee305..faaf9da 100644
--- a/migration/dirtyrate.h
+++ b/migration/dirtyrate.h
@@ -24,6 +24,11 @@
*/
#define RAMBLOCK_INFO_MAX_LEN 256
+/*
+ * Minimum RAMBlock size to sample, in megabytes.
+ */
+#define MIN_RAMBLOCK_SIZE 128
+
struct DirtyRateConfig {
uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
int64_t sample_period_seconds; /* time duration between two sampling */
--
1.8.3.1
- [PATCH v6 04/12] migration/dirtyrate: Add dirtyrate statistics series functions, (continued)
- [PATCH v6 04/12] migration/dirtyrate: Add dirtyrate statistics series functions, Chuan Zheng, 2020/08/28
- [PATCH v6 06/12] migration/dirtyrate: Record hash results for each sampled page, Chuan Zheng, 2020/08/28
- [PATCH v6 02/12] migration/dirtyrate: add DirtyRateStatus to denote calculation status, Chuan Zheng, 2020/08/28
- [PATCH v6 09/12] migration/dirtyrate: Implement set_sample_page_period() and get_sample_page_period(), Chuan Zheng, 2020/08/28
- [PATCH v6 10/12] migration/dirtyrate: Implement calculate_dirtyrate() function, Chuan Zheng, 2020/08/28
- [PATCH v6 08/12] migration/dirtyrate: skip sampling ramblock with size below MIN_RAMBLOCK_SIZE,
Chuan Zheng <=
- [PATCH v6 05/12] migration/dirtyrate: move RAMBLOCK_FOREACH_MIGRATABLE into ram.h, Chuan Zheng, 2020/08/28
- [PATCH v6 07/12] migration/dirtyrate: Compare page hash results for recorded sampled page, Chuan Zheng, 2020/08/28
- [PATCH v6 12/12] migration/dirtyrate: Add trace_calls to make it easier to debug, Chuan Zheng, 2020/08/28
- [PATCH v6 11/12] migration/dirtyrate: Implement qmp_cal_dirty_rate()/qmp_get_dirty_rate() function, Chuan Zheng, 2020/08/28
- Re: [PATCH v6 00/12] *** A Method for evaluating dirty page rate ***, David Edmondson, 2020/08/31