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authorChuan Zheng <zhengchuan@huawei.com>2020-09-16 14:22:01 +0800
committerDr. David Alan Gilbert <dgilbert@redhat.com>2020-09-25 12:45:57 +0100
commitba0e519f953310267998d6af379304bd19c50f60 (patch)
tree0d62d48e5163e68a541c54d55a45763826451f23 /migration
parent3ded54b1bd00177bf56d332636ecaf0da9d8b77e (diff)
migration/dirtyrate: Record hash results for each sampled page
Record hash results for each sampled page, crc32 is taken to calculate hash results for each sampled length in TARGET_PAGE_SIZE. Signed-off-by: Chuan Zheng <zhengchuan@huawei.com> Signed-off-by: YanYing Zhuang <ann.zhuangyanying@huawei.com> Reviewed-by: David Edmondson <david.edmondson@oracle.com> Reviewed-by: Li Qiang <liq3ea@gmail.com> Message-Id: <1600237327-33618-7-git-send-email-zhengchuan@huawei.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'migration')
-rw-r--r--migration/dirtyrate.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 10315f7a63..856d26dfe7 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -10,6 +10,7 @@
* See the COPYING file in the top-level directory.
*/
+#include <zlib.h>
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
@@ -68,6 +69,114 @@ static void update_dirtyrate(uint64_t msec)
DirtyStat.dirty_rate = dirtyrate;
}
+/*
+ * get hash result for the sampled memory with length of TARGET_PAGE_SIZE
+ * in ramblock, which starts from ramblock base address.
+ */
+static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info,
+ uint64_t vfn)
+{
+ uint32_t crc;
+
+ crc = crc32(0, (info->ramblock_addr +
+ vfn * TARGET_PAGE_SIZE), TARGET_PAGE_SIZE);
+
+ return crc;
+}
+
+static bool save_ramblock_hash(struct RamblockDirtyInfo *info)
+{
+ unsigned int sample_pages_count;
+ int i;
+ GRand *rand;
+
+ sample_pages_count = info->sample_pages_count;
+
+ /* ramblock size less than one page, return success to skip this ramblock */
+ if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) {
+ return true;
+ }
+
+ info->hash_result = g_try_malloc0_n(sample_pages_count,
+ sizeof(uint32_t));
+ if (!info->hash_result) {
+ return false;
+ }
+
+ info->sample_page_vfn = g_try_malloc0_n(sample_pages_count,
+ sizeof(uint64_t));
+ if (!info->sample_page_vfn) {
+ g_free(info->hash_result);
+ return false;
+ }
+
+ rand = g_rand_new();
+ for (i = 0; i < sample_pages_count; i++) {
+ info->sample_page_vfn[i] = g_rand_int_range(rand, 0,
+ info->ramblock_pages - 1);
+ info->hash_result[i] = get_ramblock_vfn_hash(info,
+ info->sample_page_vfn[i]);
+ }
+ g_rand_free(rand);
+
+ return true;
+}
+
+static void get_ramblock_dirty_info(RAMBlock *block,
+ struct RamblockDirtyInfo *info,
+ struct DirtyRateConfig *config)
+{
+ uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes;
+
+ /* Right shift 30 bits to calc ramblock size in GB */
+ info->sample_pages_count = (qemu_ram_get_used_length(block) *
+ sample_pages_per_gigabytes) >> 30;
+ /* Right shift TARGET_PAGE_BITS to calc page count */
+ info->ramblock_pages = qemu_ram_get_used_length(block) >>
+ TARGET_PAGE_BITS;
+ info->ramblock_addr = qemu_ram_get_host_addr(block);
+ strcpy(info->idstr, qemu_ram_get_idstr(block));
+}
+
+static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
+ struct DirtyRateConfig config,
+ int *block_count)
+{
+ struct RamblockDirtyInfo *info = NULL;
+ struct RamblockDirtyInfo *dinfo = NULL;
+ RAMBlock *block = NULL;
+ int total_count = 0;
+ int index = 0;
+ bool ret = false;
+
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ total_count++;
+ }
+
+ dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo));
+ if (dinfo == NULL) {
+ goto out;
+ }
+
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ if (index >= total_count) {
+ break;
+ }
+ info = &dinfo[index];
+ get_ramblock_dirty_info(block, info, &config);
+ if (!save_ramblock_hash(info)) {
+ goto out;
+ }
+ index++;
+ }
+ ret = true;
+
+out:
+ *block_count = index;
+ *block_dinfo = dinfo;
+ return ret;
+}
+
static void calculate_dirtyrate(struct DirtyRateConfig config)
{
/* todo */