linux-kernel - Re: [Patch v1 07/10] perf tools: add mem access sampling core support

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Date:	Wed, 31 Oct 2012 14:51:39 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, jolsa@...hat.com,
	ming.m.lin@...el.com
Subject: Re: [Patch v1 07/10] perf tools: add mem access sampling core support

On Mon, 29 Oct 2012 16:15:49 +0100, Stephane Eranian wrote:
> This patch adds the sorting and histogram support
> functions to enable profiling of memory accesses.
>
> The following sorting orders are added:
>  - symbol_daddr: data address symbol (or raw address)
>  - dso_daddr: data address shared object
>  - cost: access cost
>  - locked: access uses locked transaction
>  - tlb : TLB access
>  - mem : memory level of the access (L1, L2, L3, RAM, ...)
>  - snoop: access snoop mode
>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
[snip]
> +/* --sort daddr_sym */
> +static int64_t
> +sort__daddr_cmp(struct hist_entry *left, struct hist_entry *right)
> +{
> +	struct addr_map_symbol *l = &left->mem_info->daddr;
> +	struct addr_map_symbol *r = &right->mem_info->daddr;
> +
> +	return (int64_t)(r->addr - l->addr);
> +}

Doesn't it need to compare symbol (start address) if any, before doing
it with raw addresses?

Thanks,
Namhyung
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