Re: [PATCH 3/7] perf, x86: Implement IBS event configuration

[Peter Zijlstra <peterz@infradead.org>]

On Wed, 2011-09-07 at 18:36 +0200, Robert Richter wrote:
> +static struct perf_ibs perf_ibs_fetch = {
> +       .pmu = {
> +               .event_init     = perf_ibs_init,
> +               .add            = perf_ibs_add,
> +               .del            = perf_ibs_del,
> +       },
> +       .msr                    = MSR_AMD64_IBSFETCHCTL,
> +       .config_mask            = IBS_FETCH_CONFIG_MASK,
> +       .cnt_mask               = IBS_FETCH_MAX_CNT,
> +       .enable_mask            = IBS_FETCH_ENABLE,
> +};
> +
> +static struct perf_ibs perf_ibs_op = {
> +       .pmu = {
> +               .event_init     = perf_ibs_init,
> +               .add            = perf_ibs_add,
> +               .del            = perf_ibs_del,
> +       },
> +       .msr                    = MSR_AMD64_IBSOPCTL,
> +       .config_mask            = IBS_OP_CONFIG_MASK,
> +       .cnt_mask               = IBS_OP_MAX_CNT,
> +       .enable_mask            = IBS_OP_ENABLE,
>  }; 

Both those .pmu things want:

  .task_ctx_nr = perf_invalid_context,

disabling per-task events, or you need to create a new context and
somehow fix per-task scheduling for these two things.

Adding two task contexts (one for each type) really isn't nice.