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authorChuan Zheng <zhengchuan@huawei.com>2020-09-16 14:22:03 +0800
committerDr. David Alan Gilbert <dgilbert@redhat.com>2020-09-25 12:45:57 +0100
commitf82583cdc05b89e5900e44ceacb6cc85f974b448 (patch)
treec50862024368f8f239e8c8f66cad9d85342be18b /migration/dirtyrate.c
parent9c04387b88a7685ab2b1f77911a56e91d8f67b6d (diff)
migration/dirtyrate: skip sampling ramblock with size below MIN_RAMBLOCK_SIZE
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> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Li Qiang <liq3ea@gmail.com> Message-Id: <1600237327-33618-9-git-send-email-zhengchuan@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'migration/dirtyrate.c')
-rw-r--r--migration/dirtyrate.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 0f78aa3af7..ee47e2bc27 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -138,6 +138,18 @@ static void get_ramblock_dirty_info(RAMBlock *block,
strcpy(info->idstr, qemu_ram_get_idstr(block));
}
+static bool skip_sample_ramblock(RAMBlock *block)
+{
+ /*
+ * Sample only blocks larger than MIN_RAMBLOCK_SIZE.
+ */
+ if (qemu_ram_get_used_length(block) < (MIN_RAMBLOCK_SIZE << 10)) {
+ return true;
+ }
+
+ return false;
+}
+
static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
struct DirtyRateConfig config,
int *block_count)
@@ -150,6 +162,9 @@ static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
bool ret = false;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (skip_sample_ramblock(block)) {
+ continue;
+ }
total_count++;
}
@@ -159,6 +174,9 @@ static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
}
RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (skip_sample_ramblock(block)) {
+ continue;
+ }
if (index >= total_count) {
break;
}
@@ -225,6 +243,9 @@ static bool compare_page_hash_info(struct RamblockDirtyInfo *info,
RAMBlock *block = NULL;
RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (skip_sample_ramblock(block)) {
+ continue;
+ }
block_dinfo = find_block_matched(block, block_count, info);
if (block_dinfo == NULL) {
continue;