Re: [PATCH V4 05/16] perf, core: pmu specific data for perf task context

[Peter Zijlstra]

On Mon, Jun 30, 2014 at 04:50:42PM +0800, Yan, Zheng wrote:

> @@ -3068,6 +3077,14 @@ alloc_perf_context(struct pmu *pmu, struct task_struct 
> *task)
>       if (!ctx)
>               return NULL;
>  
> +     if (task && pmu->task_ctx_size > 0) {
> +             ctx->task_ctx_data = kzalloc(pmu->task_ctx_size, GFP_KERNEL);
> +             if (!ctx->task_ctx_data) {
> +                     kfree(ctx);
> +                     return NULL;
> +             }
> +     }

Can we delay this allocation until such time as that its actually
needed? Otherwise we're wasting all this memory..

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