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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>
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@ -10,6 +10,7 @@
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* See the COPYING file in the top-level directory.
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* See the COPYING file in the top-level directory.
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*/
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*/
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#include <zlib.h>
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#include "qemu/osdep.h"
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/error.h"
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#include "cpu.h"
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#include "cpu.h"
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@ -68,6 +69,114 @@ static void update_dirtyrate(uint64_t msec)
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DirtyStat.dirty_rate = dirtyrate;
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DirtyStat.dirty_rate = dirtyrate;
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}
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}
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/*
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* get hash result for the sampled memory with length of TARGET_PAGE_SIZE
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* in ramblock, which starts from ramblock base address.
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*/
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static uint32_t get_ramblock_vfn_hash(struct RamblockDirtyInfo *info,
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uint64_t vfn)
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{
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uint32_t crc;
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crc = crc32(0, (info->ramblock_addr +
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vfn * TARGET_PAGE_SIZE), TARGET_PAGE_SIZE);
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return crc;
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}
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static bool save_ramblock_hash(struct RamblockDirtyInfo *info)
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{
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unsigned int sample_pages_count;
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int i;
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GRand *rand;
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sample_pages_count = info->sample_pages_count;
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/* ramblock size less than one page, return success to skip this ramblock */
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if (unlikely(info->ramblock_pages == 0 || sample_pages_count == 0)) {
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return true;
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}
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info->hash_result = g_try_malloc0_n(sample_pages_count,
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sizeof(uint32_t));
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if (!info->hash_result) {
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return false;
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}
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info->sample_page_vfn = g_try_malloc0_n(sample_pages_count,
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sizeof(uint64_t));
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if (!info->sample_page_vfn) {
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g_free(info->hash_result);
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return false;
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}
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rand = g_rand_new();
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for (i = 0; i < sample_pages_count; i++) {
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info->sample_page_vfn[i] = g_rand_int_range(rand, 0,
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info->ramblock_pages - 1);
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info->hash_result[i] = get_ramblock_vfn_hash(info,
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info->sample_page_vfn[i]);
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}
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g_rand_free(rand);
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return true;
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}
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static void get_ramblock_dirty_info(RAMBlock *block,
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struct RamblockDirtyInfo *info,
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struct DirtyRateConfig *config)
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{
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uint64_t sample_pages_per_gigabytes = config->sample_pages_per_gigabytes;
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/* Right shift 30 bits to calc ramblock size in GB */
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info->sample_pages_count = (qemu_ram_get_used_length(block) *
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sample_pages_per_gigabytes) >> 30;
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/* Right shift TARGET_PAGE_BITS to calc page count */
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info->ramblock_pages = qemu_ram_get_used_length(block) >>
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TARGET_PAGE_BITS;
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info->ramblock_addr = qemu_ram_get_host_addr(block);
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strcpy(info->idstr, qemu_ram_get_idstr(block));
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}
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static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
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struct DirtyRateConfig config,
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int *block_count)
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{
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struct RamblockDirtyInfo *info = NULL;
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struct RamblockDirtyInfo *dinfo = NULL;
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RAMBlock *block = NULL;
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int total_count = 0;
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int index = 0;
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bool ret = false;
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RAMBLOCK_FOREACH_MIGRATABLE(block) {
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total_count++;
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}
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dinfo = g_try_malloc0_n(total_count, sizeof(struct RamblockDirtyInfo));
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if (dinfo == NULL) {
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goto out;
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}
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RAMBLOCK_FOREACH_MIGRATABLE(block) {
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if (index >= total_count) {
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break;
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}
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info = &dinfo[index];
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get_ramblock_dirty_info(block, info, &config);
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if (!save_ramblock_hash(info)) {
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goto out;
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}
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index++;
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}
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ret = true;
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out:
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*block_count = index;
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*block_dinfo = dinfo;
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return ret;
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}
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static void calculate_dirtyrate(struct DirtyRateConfig config)
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static void calculate_dirtyrate(struct DirtyRateConfig config)
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{
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{
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/* todo */
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/* todo */
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