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Re: [PATCH v5 07/12] migration/dirtyrate: Compare page hash results for
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PATCH v5 07/12] migration/dirtyrate: Compare page hash results for recorded sampled page |
Date: |
Wed, 26 Aug 2020 17:36:54 +0100 |
User-agent: |
Mutt/1.14.6 (2020-07-11) |
* Chuan Zheng (zhengchuan@huawei.com) wrote:
> Compare page hash results for recorded sampled page.
>
> Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
> Signed-off-by: YanYing Zhuang <ann.zhuangyanying@huawei.com>
So I think this is OK, with the minor clean up suggestions of David E.
> ---
> migration/dirtyrate.c | 64
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 64 insertions(+)
>
> diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
> index 66de426..050270d 100644
> --- a/migration/dirtyrate.c
> +++ b/migration/dirtyrate.c
> @@ -202,6 +202,70 @@ static int record_ramblock_hash_info(struct
> RamblockDirtyInfo **block_dinfo,
> return 0;
> }
>
> +static int calc_page_dirty_rate(struct RamblockDirtyInfo *info)
> +{
> + uint32_t crc;
> + int i;
> +
> + for (i = 0; i < info->sample_pages_count; i++) {
> + crc = get_ramblock_vfn_hash(info, info->sample_page_vfn[i]);
> + if (crc != info->hash_result[i]) {
> + info->sample_dirty_count++;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static bool find_page_matched(RAMBlock *block, struct RamblockDirtyInfo
> *infos,
> + int count, struct RamblockDirtyInfo **matched)
> +{
> + int i;
> +
> + for (i = 0; i < count; i++) {
> + if (!strcmp(infos[i].idstr, qemu_ram_get_idstr(block))) {
> + break;
> + }
> + }
> +
> + if (i == count) {
> + return false;
> + }
> +
> + if (infos[i].ramblock_addr != qemu_ram_get_host_addr(block) ||
> + infos[i].ramblock_pages !=
> + (qemu_ram_get_used_length(block) >> DIRTYRATE_PAGE_SHIFT_KB)) {
> + return false;
> + }
> +
> + *matched = &infos[i];
> + return true;
> +}
> +
> +static int compare_page_hash_info(struct RamblockDirtyInfo *info,
> + int block_index)
> +{
> + struct RamblockDirtyInfo *block_dinfo = NULL;
> + RAMBlock *block = NULL;
> +
> + RAMBLOCK_FOREACH_MIGRATABLE(block) {
> + block_dinfo = NULL;
> + if (!find_page_matched(block, info, block_index + 1, &block_dinfo)) {
> + continue;
> + }
> + if (calc_page_dirty_rate(block_dinfo) < 0) {
> + return -1;
> + }
> + update_dirtyrate_stat(block_dinfo);
> + }
> +
> + if (!DirtyStat.total_sample_count) {
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> static void calculate_dirtyrate(struct DirtyRateConfig config)
> {
> /* todo */
> --
> 1.8.3.1
>
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
- [PATCH v5 02/12] migration/dirtyrate: add DirtyRateStatus to denote calculation status, (continued)
- [PATCH v5 08/12] migration/dirtyrate: skip sampling ramblock with size below MIN_RAMBLOCK_SIZE, Chuan Zheng, 2020/08/24
- [PATCH v5 10/12] migration/dirtyrate: Implement calculate_dirtyrate() function, Chuan Zheng, 2020/08/24
- [PATCH v5 09/12] migration/dirtyrate: Implement get_sample_page_period() and block_sample_page_period(), Chuan Zheng, 2020/08/24
- [PATCH v5 11/12] migration/dirtyrate: Implement qmp_cal_dirty_rate()/qmp_get_dirty_rate() function, Chuan Zheng, 2020/08/24
- [PATCH v5 05/12] migration/dirtyrate: move RAMBLOCK_FOREACH_MIGRATABLE into ram.h, Chuan Zheng, 2020/08/24
- [PATCH v5 07/12] migration/dirtyrate: Compare page hash results for recorded sampled page, Chuan Zheng, 2020/08/24
- Re: [PATCH v5 07/12] migration/dirtyrate: Compare page hash results for recorded sampled page,
Dr. David Alan Gilbert <=
- [PATCH v5 12/12] migration/dirtyrate: Add trace_calls to make it easier to debug, Chuan Zheng, 2020/08/24