@@ -25,6 +25,7 @@
#include "dirtyrate.h"
CalculatingDirtyRateState CalculatingState = CAL_DIRTY_RATE_INIT;
+static unsigned long int qcrypto_hash_len = QCRYPTO_HASH_LEN;
static struct DirtyRateStat dirty_stat;
static int dirty_rate_set_state(int new_state)
@@ -71,6 +72,140 @@ static void update_dirtyrate(uint64_t msec)
dirty_stat.dirty_rate = dirty_rate;
}
+/*
+ * get hash result for the sampled memory with length of 4K byte in ramblock,
+ * which starts from ramblock base address.
+ */
+static int get_ramblock_vfn_hash(struct RamblockDirtyInfo *info, unsigned long vfn,
+ uint8_t **md)
+{
+ struct iovec iov_array;
+ int ret = 0;
+ int nkey = 1;
+
+ iov_array.iov_base = info->ramblock_addr +
+ vfn * DIRTYRATE_SAMPLE_PAGE_SIZE;
+ iov_array.iov_len = DIRTYRATE_SAMPLE_PAGE_SIZE;
+
+ if (qcrypto_hash_bytesv(QCRYPTO_HASH_ALG_MD5,
+ &iov_array, nkey,
+ md, &qcrypto_hash_len, NULL) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+static int save_ramblock_hash(struct RamblockDirtyInfo *info)
+{
+ unsigned int sample_pages_count;
+ uint8_t *md = NULL;
+ int i;
+ int ret = -1;
+ GRand* rand = g_rand_new();
+
+ 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)) {
+ ret = 0;
+ goto out;
+ }
+
+ info->hash_result = g_try_malloc0_n(sample_pages_count, sizeof(uint8_t) * qcrypto_hash_len);
+ if (!info->hash_result) {
+ ret = -1;
+ goto out;
+ }
+
+ info->sample_page_vfn = g_try_malloc0_n(sample_pages_count, sizeof(unsigned long));
+ if (!info->sample_page_vfn) {
+ g_free(info->hash_result);
+ ret = -1;
+ goto out;
+ }
+
+ for (i = 0; i < sample_pages_count; i++) {
+ md = info->hash_result + i * qcrypto_hash_len;
+ info->sample_page_vfn[i] = g_rand_int_range(rand, 0, info->ramblock_pages - 1);
+ ret = get_ramblock_vfn_hash(info, info->sample_page_vfn[i], &md);
+ if (ret < 0) {
+ goto out;
+ }
+ }
+ ret = 0;
+
+out:
+ g_rand_free(rand);
+ return ret;
+}
+
+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 block size in GB */
+ info->sample_pages_count = (qemu_ram_get_used_length(block) * sample_pages_per_gigabytes) >> 30;
+
+ /* Right shift 12 bits to calc page count in 4KB */
+ info->ramblock_pages = qemu_ram_get_used_length(block) >> 12;
+ info->ramblock_addr = qemu_ram_get_host_addr(block);
+ strcpy(info->idstr, qemu_ram_get_idstr(block));
+}
+
+static struct RamblockDirtyInfo *
+alloc_ramblock_dirty_info(int *block_index,
+ struct RamblockDirtyInfo *block_dinfo)
+{
+ struct RamblockDirtyInfo *info = NULL;
+ int index = *block_index;
+
+ if (!block_dinfo) {
+ block_dinfo = g_try_new(struct RamblockDirtyInfo, 1);
+ index = 0;
+ } else {
+ index++;
+ block_dinfo = g_try_realloc(block_dinfo, (index + 1) *
+ sizeof(struct RamblockDirtyInfo));
+ }
+ if (!block_dinfo)
+ return NULL;
+
+ info = &block_dinfo[index];
+ memset(info, 0, sizeof(struct RamblockDirtyInfo));
+
+ *block_index = index;
+ return block_dinfo;
+}
+
+static int record_ramblock_hash_info(struct DirtyRateConfig config,
+ struct RamblockDirtyInfo **block_dinfo, int *block_index)
+{
+ struct RamblockDirtyInfo *info = NULL;
+ struct RamblockDirtyInfo *dinfo = NULL;
+ RAMBlock *block = NULL;
+ int index = 0;
+
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ dinfo = alloc_ramblock_dirty_info(&index, dinfo);
+ if (dinfo == NULL)
+ return -1;
+ info = &dinfo[index];
+ get_ramblock_dirty_info(block, info, &config);
+ if (save_ramblock_hash(info) < 0) {
+ *block_dinfo = dinfo;
+ *block_index = index;
+ return -1;
+ }
+ }
+
+ *block_dinfo = dinfo;
+ *block_index = index;
+
+ return 0;
+}
+
static void calculate_dirtyrate(struct DirtyRateConfig config)
{
/* todo */
@@ -20,10 +20,17 @@
#define DIRTYRATE_DEFAULT_SAMPLE_PAGES 256
/*
+ * Sample page size 4K as default.
+ */
+#define DIRTYRATE_SAMPLE_PAGE_SIZE 4096
+
+/*
* Record ramblock idstr
*/
#define RAMBLOCK_INFO_MAX_LEN 256
+#define QCRYPTO_HASH_LEN 16
+
/* Take 1s as default for calculation duration */
#define DEFAULT_FETCH_DIRTYRATE_TIME_SEC 1