linux-kernel - Re: [PATCH 18/30] x86, kaiser: map virtually-addressed performance monitoring buffers

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Message-ID: <20171114182009.jbhobwxlkfjb2t6i@hirez.programming.kicks-ass.net>
Date:   Tue, 14 Nov 2017 19:20:09 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, x86@...nel.org
Subject: Re: [PATCH 18/30] x86, kaiser: map virtually-addressed performance
 monitoring buffers

On Fri, Nov 10, 2017 at 11:31:39AM -0800, Dave Hansen wrote:
>  static int alloc_ds_buffer(int cpu)
>  {
> +	struct debug_store *ds = per_cpu_ptr(&cpu_debug_store, cpu);
>  
> +	memset(ds, 0, sizeof(*ds));

Still wondering about that memset...

>  	per_cpu(cpu_hw_events, cpu).ds = ds;
>  
>  	return 0;