linux-kernel - Re: [RFC PATCH v9 49/50 -fix] perf probe: Init symbol as kprobe if any event is kprobe

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Message-ID: <20150629143330.GE11747@kernel.org>
Date:	Mon, 29 Jun 2015 11:33:30 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	ast@...mgrid.com, brendan.d.gregg@...il.com, daniel@...earbox.net,
	namhyung@...nel.org, masami.hiramatsu.pt@...achi.com,
	paulus@...ba.org, a.p.zijlstra@...llo.nl, mingo@...hat.com,
	jolsa@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, hekuang@...wei.com, xiakaixu@...wei.com,
	pi3orama@....com
Subject: Re: [RFC PATCH v9 49/50 -fix] perf probe: Init symbol as kprobe if
 any event is kprobe

Em Sat, Jun 27, 2015 at 12:25:45PM +0000, Wang Nan escreveu:
> Before this patch, add_perf_probe_events() init symbol maps only for
> uprobe if the first 'struct perf_probe_event' passed to it is a uprobe
> event. This is a trick because 'perf probe''s command line syntax
> constrains the first elements of the probe_event arrays must be kprobes
> if there is one.
> 
> However, with the incoming BPF uprobe support, the constrain is not
> hold since 'perf record' will also probe on k/u probes through BPF
> object, and is possible to pass an array with kprobe but the first
> element is uprobe.
> 
> This patch init symbol maps for kprobes even if all of events are
> uprobes, because the extra cost should be small enough.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---

Please add more info here, i.e. is this to be applied on top of the
original 49/50? I guess so, but please state this in the future to speed
things up.

- Arnaldo

>  tools/perf/util/probe-event.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index ea08015..e74ca8f 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -2804,7 +2804,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
>  {
>  	int i, ret;
>  
> -	ret = init_symbol_maps(pevs->uprobes);
> +	ret = init_symbol_maps(false);
>  	if (ret < 0)
>  		return ret;
>  
> -- 
> 1.8.3.4
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