Re: [PATCH v15 09/12] perf record: Read from overwritable ring buffer

[Jiri Olsa]

On Tue, Jul 12, 2016 at 10:00:09AM +0000, Wang Nan wrote:

SNIP

> + * (1): Pause ring buffers for reading
> + * (2): Read from ring buffers
> + * (3): Resume ring buffers for recording
> + */
> +enum overwrite_evt_state {
> +     OVERWRITE_EVT_RUNNING,
> +     OVERWRITE_EVT_DATA_PENDING,
> +     OVERWRITE_EVT_EMPTY,
> +};
>  
>  struct record {
>       struct perf_tool        tool;
> @@ -61,6 +85,7 @@ struct record {
>       bool                    buildid_all;
>       bool                    timestamp_filename;
>       bool                    switch_output;
> +     enum overwrite_evt_state overwrite_evt_state;
>       unsigned long long      samples;

I wonder this would be better to have in 'struct evlist',
also 'enum owr_mmap_state'  might be better name then

thanks,
jirka