diff options
Diffstat (limited to 'migration/dirtyrate.h')
| -rw-r--r-- | migration/dirtyrate.h | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h index 594a5c0bb6..869c060941 100644 --- a/migration/dirtyrate.h +++ b/migration/dirtyrate.h @@ -31,10 +31,12 @@ #define MIN_RAMBLOCK_SIZE 128 /* - * Take 1s as minimum time for calculation duration + * Allowed range for dirty page rate calculation (in milliseconds). + * Lower limit relates to the smallest realistic downtime it + * makes sense to impose on migration. */ -#define MIN_FETCH_DIRTYRATE_TIME_SEC 1 -#define MAX_FETCH_DIRTYRATE_TIME_SEC 60 +#define MIN_CALC_TIME_MS 50 +#define MAX_CALC_TIME_MS 60000 /* * Take 1/16 pages in 1G as the maxmum sample page count @@ -44,7 +46,7 @@ struct DirtyRateConfig { uint64_t sample_pages_per_gigabytes; /* sample pages per GB */ - int64_t sample_period_seconds; /* time duration between two sampling */ + int64_t calc_time_ms; /* desired calculation time (in milliseconds) */ DirtyRateMeasureMode mode; /* mode of dirtyrate measurement */ }; @@ -73,7 +75,7 @@ typedef struct SampleVMStat { 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 */ + int64_t calc_time_ms; /* actual calculation time (in milliseconds) */ uint64_t sample_pages; /* sample pages per GB */ union { SampleVMStat page_sampling; |