linux-kernel - Re: [PATCH] perf report: Don't shadow inlined symbol with different addr range

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Date:   Tue, 19 Feb 2019 15:02:13 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     He Kuang <hekuang@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf report: Don't shadow inlined symbol with different
 addr range

On Tue, Feb 19, 2019 at 09:05:31PM +0800, He Kuang wrote:
> We can't assume inlined symbols with the same name are equal, because
> their address range may be different. This will cause the symbols with
> different addresses be shadowed when adding to the hist entry, and lead
> to ERANGE error when checking the symbol address during sample parse, the
> addr should be within the range of [sym.start, sym.end].
> 
> The error message is like: "0x36aea60 [0x8]: failed to process type: 68".
> 
> The second parameter of symbol__new() is the length of the fake symbol for
> the inline frame, which is the subtraction of the end and start address of
> base_sym.
> 
> Signed-off-by: He Kuang <hekuang@...wei.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/util/sort.c    | 10 ++++++++--
>  tools/perf/util/srcline.c |  2 +-
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 6c1a83768eb0..d0334c33da54 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -230,8 +230,14 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r)
>  	if (sym_l == sym_r)
>  		return 0;
>  
> -	if (sym_l->inlined || sym_r->inlined)
> -		return strcmp(sym_l->name, sym_r->name);
> +	if (sym_l->inlined || sym_r->inlined) {
> +		int ret = strcmp(sym_l->name, sym_r->name);
> +
> +		if (ret)
> +			return ret;
> +		if ((sym_l->start <= sym_r->end) && (sym_l->end >= sym_r->start))
> +			return 0;
> +	}
>  
>  	if (sym_l->start != sym_r->start)
>  		return (int64_t)(sym_r->start - sym_l->start);
> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index dc86597d0cc4..ccf42c4e83f0 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -104,7 +104,7 @@ static struct symbol *new_inline_sym(struct dso *dso,
>  	} else {
>  		/* create a fake symbol for the inline frame */
>  		inline_sym = symbol__new(base_sym ? base_sym->start : 0,
> -					 base_sym ? base_sym->end : 0,
> +					 base_sym ? (base_sym->end - base_sym->start) : 0,
>  					 base_sym ? base_sym->binding : 0,
>  					 base_sym ? base_sym->type : 0,
>  					 funcname);
> -- 
> 2.20.1
>