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migration/dirtyrate: Record hash results for each sampled page

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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>
This commit is contained in:
Chuan Zheng 2020-09-16 14:22:01 +08:00 committed by Dr. David Alan Gilbert
parent 3ded54b1bd
commit ba0e519f95
1 changed files with 109 additions and 0 deletions
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109
migration/dirtyrate.c
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@ -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 */