From bd9510d38546a19aa2e58e1a94597acfb0fd82d4 Mon Sep 17 00:00:00 2001 From: Zhenzhong Duan Date: Tue, 29 Nov 2022 12:04:04 +0800 Subject: [PATCH] migration/dirtyrate: Show sample pages only in page-sampling mode The value of "Sample Pages" is confusing in mode other than page-sampling. See below: (qemu) calc_dirty_rate -b 10 520 (qemu) info dirty_rate Status: measuring Start Time: 11646834 (ms) Sample Pages: 520 (per GB) Period: 10 (sec) Mode: dirty-bitmap Dirty rate: (not ready) (qemu) info dirty_rate Status: measured Start Time: 11646834 (ms) Sample Pages: 0 (per GB) Period: 10 (sec) Mode: dirty-bitmap Dirty rate: 2 (MB/s) While it's totally useless in dirty-ring and dirty-bitmap mode, fix to show it only in page-sampling mode. Signed-off-by: Zhenzhong Duan Reviewed-by: Peter Xu Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/dirtyrate.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c index 4bfb97fc68..575d48c397 100644 --- a/migration/dirtyrate.c +++ b/migration/dirtyrate.c @@ -714,8 +714,8 @@ void qmp_calc_dirty_rate(int64_t calc_time, mode = DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING; } - if (has_sample_pages && mode == DIRTY_RATE_MEASURE_MODE_DIRTY_RING) { - error_setg(errp, "either sample-pages or dirty-ring can be specified."); + if (has_sample_pages && mode != DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) { + error_setg(errp, "sample-pages is used only in page-sampling mode"); return; } @@ -785,8 +785,10 @@ void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict) DirtyRateStatus_str(info->status)); monitor_printf(mon, "Start Time: %"PRIi64" (ms)\n", info->start_time); - monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n", - info->sample_pages); + if (info->mode == DIRTY_RATE_MEASURE_MODE_PAGE_SAMPLING) { + monitor_printf(mon, "Sample Pages: %"PRIu64" (per GB)\n", + info->sample_pages); + } monitor_printf(mon, "Period: %"PRIi64" (sec)\n", info->calc_time); monitor_printf(mon, "Mode: %s\n",