Re: [PATCH v3 2/7] hmp: Add "calc_dirty_rate" and "info dirty_rate" cmds

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* huangy81@chinatelecom.cn (huangy81@chinatelecom.cn) wrote:
> From: Peter Xu <peterx@redhat.com>
> 
> These two commands are missing when adding the QMP sister commands.
> Add them, so developers can play with them easier.
> 
> Signed-off-by: Peter Xu <peterx@redhat.com>
> Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn>


Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  hmp-commands-info.hx  | 13 ++++++++++++
>  hmp-commands.hx       | 14 +++++++++++++
>  include/monitor/hmp.h |  2 ++
>  migration/dirtyrate.c | 47 +++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 76 insertions(+)
> 
> diff --git a/hmp-commands-info.hx b/hmp-commands-info.hx
> index b2347a6aea..fb59c27200 100644
> --- a/hmp-commands-info.hx
> +++ b/hmp-commands-info.hx
> @@ -867,3 +867,16 @@ SRST
>    ``info replay``
>      Display the record/replay information: mode and the current icount.
>  ERST
> +
> +    {
> +        .name       = "dirty_rate",
> +        .args_type  = "",
> +        .params     = "",
> +        .help       = "show dirty rate information",
> +        .cmd        = hmp_info_dirty_rate,
> +    },
> +
> +SRST
> +  ``info dirty_rate``
> +    Display the vcpu dirty rate information.
> +ERST
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 2d21fe5ad4..84dcc3aae6 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1727,3 +1727,17 @@ ERST
>          .flags      = "p",
>      },
>  
> +SRST
> +``calc_dirty_rate`` *second*
> +  Start a round of dirty rate measurement with the period specified in *second*.
> +  The result of the dirty rate measurement may be observed with ``info
> +  dirty_rate`` command.
> +ERST
> +
> +    {
> +        .name       = "calc_dirty_rate",
> +        .args_type  = "second:l,sample_pages_per_GB:l?",
> +        .params     = "second [sample_pages_per_GB]",
> +        .help       = "start a round of guest dirty rate measurement",
> +        .cmd        = hmp_calc_dirty_rate,
> +    },
> diff --git a/include/monitor/hmp.h b/include/monitor/hmp.h
> index 605d57287a..3baa1058e2 100644
> --- a/include/monitor/hmp.h
> +++ b/include/monitor/hmp.h
> @@ -129,5 +129,7 @@ void hmp_info_replay(Monitor *mon, const QDict *qdict);
>  void hmp_replay_break(Monitor *mon, const QDict *qdict);
>  void hmp_replay_delete_break(Monitor *mon, const QDict *qdict);
>  void hmp_replay_seek(Monitor *mon, const QDict *qdict);
> +void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict);
> +void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict);
>  
>  #endif
> diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
> index 2ee3890721..320c56ba2c 100644
> --- a/migration/dirtyrate.c
> +++ b/migration/dirtyrate.c
> @@ -20,6 +20,9 @@
>  #include "ram.h"
>  #include "trace.h"
>  #include "dirtyrate.h"
> +#include "monitor/hmp.h"
> +#include "monitor/monitor.h"
> +#include "qapi/qmp/qdict.h"
>  
>  static int CalculatingState = DIRTY_RATE_STATUS_UNSTARTED;
>  static struct DirtyRateStat DirtyStat;
> @@ -447,3 +450,47 @@ struct DirtyRateInfo *qmp_query_dirty_rate(Error **errp)
>  {
>      return query_dirty_rate_info();
>  }
> +
> +void hmp_info_dirty_rate(Monitor *mon, const QDict *qdict)
> +{
> +    DirtyRateInfo *info = query_dirty_rate_info();
> +
> +    monitor_printf(mon, "Status: %s\n",
> +                   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);
> +    monitor_printf(mon, "Period: %"PRIi64" (sec)\n",
> +                   info->calc_time);
> +    monitor_printf(mon, "Dirty rate: ");
> +    if (info->has_dirty_rate) {
> +        monitor_printf(mon, "%"PRIi64" (MB/s)\n", info->dirty_rate);
> +    } else {
> +        monitor_printf(mon, "(not ready)\n");
> +    }
> +    g_free(info);
> +}
> +
> +void hmp_calc_dirty_rate(Monitor *mon, const QDict *qdict)
> +{
> +    int64_t sec = qdict_get_try_int(qdict, "second", 0);
> +    int64_t sample_pages = qdict_get_try_int(qdict, "sample_pages_per_GB", -1);
> +    bool has_sample_pages = (sample_pages != -1);
> +    Error *err = NULL;
> +
> +    if (!sec) {
> +        monitor_printf(mon, "Incorrect period length specified!\n");
> +        return;
> +    }
> +
> +    qmp_calc_dirty_rate(sec, has_sample_pages, sample_pages, &err);
> +    if (err) {
> +        hmp_handle_error(mon, err);
> +        return;
> +    }
> +
> +    monitor_printf(mon, "Starting dirty rate measurement with period %"PRIi64
> +                   " seconds\n", sec);
> +    monitor_printf(mon, "[Please use 'info dirty_rate' to check results]\n");
> +}
> -- 
> 2.18.2
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK