From: Hyman Huang(黄勇) <huang...@chinatelecom.cn> introduce optional sample-pages argument in calc-dirty-rate, making sample page count per GB configurable so that more accurate dirtyrate can be calculated.
Signed-off-by: Hyman Huang(黄勇) <huang...@chinatelecom.cn> --- migration/dirtyrate.c | 32 ++++++++++++++++++++++++++++---- migration/dirtyrate.h | 8 +++++++- qapi/migration.json | 13 ++++++++++--- 3 files changed, 45 insertions(+), 8 deletions(-) diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c index ccb9814..43a531c 100644 --- a/migration/dirtyrate.c +++ b/migration/dirtyrate.c @@ -48,6 +48,16 @@ static bool is_sample_period_valid(int64_t sec) return true; } +static bool is_sample_pages_valid(int64_t pages) +{ + if (pages < MIN_SAMPLE_PAGE_COUNT || + pages > MAX_SAMPLE_PAGE_COUNT) { + return false; + } + + return true; +} + static int dirtyrate_set_state(int *state, int old_state, int new_state) { assert(new_state < DIRTY_RATE_STATUS__MAX); @@ -72,13 +82,15 @@ static struct DirtyRateInfo *query_dirty_rate_info(void) info->status = CalculatingState; info->start_time = DirtyStat.start_time; info->calc_time = DirtyStat.calc_time; + info->sample_pages = DirtyStat.sample_pages; trace_query_dirty_rate_info(DirtyRateStatus_str(CalculatingState)); return info; } -static void init_dirtyrate_stat(int64_t start_time, int64_t calc_time) +static void init_dirtyrate_stat(int64_t start_time, int64_t calc_time, + uint64_t sample_pages) { DirtyStat.total_dirty_samples = 0; DirtyStat.total_sample_count = 0; @@ -86,6 +98,7 @@ static void init_dirtyrate_stat(int64_t start_time, int64_t calc_time) DirtyStat.dirty_rate = -1; DirtyStat.start_time = start_time; DirtyStat.calc_time = calc_time; + DirtyStat.sample_pages = sample_pages; } static void update_dirtyrate_stat(struct RamblockDirtyInfo *info) @@ -361,6 +374,7 @@ void *get_dirtyrate_thread(void *arg) int ret; int64_t start_time; int64_t calc_time; + uint64_t sample_pages; ret = dirtyrate_set_state(&CalculatingState, DIRTY_RATE_STATUS_UNSTARTED, DIRTY_RATE_STATUS_MEASURING); @@ -371,7 +385,8 @@ void *get_dirtyrate_thread(void *arg) start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000; calc_time = config.sample_period_seconds; - init_dirtyrate_stat(start_time, calc_time); + sample_pages = config.sample_pages_per_gigabytes; + init_dirtyrate_stat(start_time, calc_time, sample_pages); calculate_dirtyrate(config); @@ -383,7 +398,8 @@ void *get_dirtyrate_thread(void *arg) return NULL; } -void qmp_calc_dirty_rate(int64_t calc_time, Error **errp) +void qmp_calc_dirty_rate(int64_t calc_time, bool has_sample_pages, + int64_t sample_pages, Error **errp) { static struct DirtyRateConfig config; QemuThread thread; @@ -404,6 +420,13 @@ void qmp_calc_dirty_rate(int64_t calc_time, Error **errp) return; } + if (has_sample_pages && !is_sample_pages_valid(sample_pages)) { + error_setg(errp, "sample-pages is out of range[%d, %d].", + MIN_SAMPLE_PAGE_COUNT, + MAX_SAMPLE_PAGE_COUNT); + return; + } + /* * Init calculation state as unstarted. */ @@ -415,7 +438,8 @@ void qmp_calc_dirty_rate(int64_t calc_time, Error **errp) } config.sample_period_seconds = calc_time; - config.sample_pages_per_gigabytes = DIRTYRATE_DEFAULT_SAMPLE_PAGES; + config.sample_pages_per_gigabytes = + has_sample_pages ? sample_pages : DIRTYRATE_DEFAULT_SAMPLE_PAGES; qemu_thread_create(&thread, "get_dirtyrate", get_dirtyrate_thread, (void *)&config, QEMU_THREAD_DETACHED); } diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h index 6ec4295..5f987e2 100644 --- a/migration/dirtyrate.h +++ b/migration/dirtyrate.h @@ -15,7 +15,6 @@ /* * Sample 512 pages per GB as default. - * TODO: Make it configurable. */ #define DIRTYRATE_DEFAULT_SAMPLE_PAGES 512 @@ -35,6 +34,12 @@ #define MIN_FETCH_DIRTYRATE_TIME_SEC 1 #define MAX_FETCH_DIRTYRATE_TIME_SEC 60 +/* + * Take 128 as minimum for sample dirty pages + */ +#define MIN_SAMPLE_PAGE_COUNT 128 +#define MAX_SAMPLE_PAGE_COUNT 4096 + struct DirtyRateConfig { uint64_t sample_pages_per_gigabytes; /* sample pages per GB */ int64_t sample_period_seconds; /* time duration between two sampling */ @@ -63,6 +68,7 @@ struct DirtyRateStat { int64_t dirty_rate; /* dirty rate in MB/s */ int64_t start_time; /* calculation start time in units of second */ int64_t calc_time; /* time duration of two sampling in units of second */ + uint64_t sample_pages; /* sample pages per GB */ }; void *get_dirtyrate_thread(void *arg); diff --git a/qapi/migration.json b/qapi/migration.json index 9bf0bc4..868a867 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -1741,6 +1741,9 @@ # # @calc-time: time in units of second for sample dirty pages # +# @sample-pages: page count per GB for sample dirty pages +# the default value is 512 +# # Since: 5.2 # ## @@ -1748,7 +1751,8 @@ 'data': {'*dirty-rate': 'int64', 'status': 'DirtyRateStatus', 'start-time': 'int64', - 'calc-time': 'int64'} } + 'calc-time': 'int64', + 'sample-pages': 'uint64'} } ## # @calc-dirty-rate: @@ -1757,13 +1761,16 @@ # # @calc-time: time in units of second for sample dirty pages # +# @sample-pages: page count per GB for sample dirty pages +# the default value is 512 +# # Since: 5.2 # # Example: -# {"command": "calc-dirty-rate", "data": {"calc-time": 1} } +# {"command": "calc-dirty-rate", "data": {"calc-time": 1, 'sample-pages': 512} } # ## -{ 'command': 'calc-dirty-rate', 'data': {'calc-time': 'int64'} } +{ 'command': 'calc-dirty-rate', 'data': {'calc-time': 'int64', '*sample-pages': 'int'} } ## # @query-dirty-rate: -- 1.8.3.1