linux-kernel - Re: [PATCH 2/2] perf tools: Construct LBR call chain

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 12 Nov 2014 09:58:25 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, a.p.zijlstra@...llo.nl, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...hat.com, paulus@...ba.org,
	ak@...ux.intel.com
Subject: Re: [PATCH 2/2] perf tools: Construct LBR call chain

On Thu, Nov 06, 2014 at 09:58:06AM -0500, kan.liang@...el.com wrote:

SNIP

> +	struct ip_callchain *chain = sample->callchain;
>  	u8 cpumode = PERF_RECORD_MISC_USER;
>  	int chain_nr = min(max_stack, (int)chain->nr);
> -	int i;
> -	int j;
> -	int err;
> +	int i, j, err = 0;
>  	int skip_idx __maybe_unused;
> +	int lbr = 0;
> +	u64 ip;
>  
>  	callchain_cursor_reset(&callchain_cursor);
>  
> @@ -1419,74 +1471,81 @@ static int thread__resolve_callchain_sample(struct thread *thread,
>  		return 0;
>  	}
>  
> -	/*
> -	 * Based on DWARF debug information, some architectures skip
> -	 * a callchain entry saved by the kernel.
> -	 */
> -	skip_idx = arch_skip_callchain_idx(thread, chain);
> +	if (evsel->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK)
> +		lbr = 1;

please put this in a function.. like

bool has_branch_callstack(evsel)

thanks,
jirka
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/