linux-kernel - Re: [PATCH 1/1] perf probe: Do not use map

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Message-Id: <20160901084214.35eb9c11c1e4a285d4f88ef6@kernel.org>
Date:   Thu, 1 Sep 2016 08:42:14 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Wang Nan <wangnan0@...wei.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf probe: Do not use map_load filters for
 function

On Wed, 31 Aug 2016 10:04:27 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> It is simpler to just do the loop, no need for globals and the last user
> of such facility disappears.
> 
> Testing:
> 
>   # perf probe -F [a-z]*recvmsg
>   aead_recvmsg
>   compat_SyS_recvmsg
>   compat_sys_recvmsg
>   hash_recvmsg
>   inet_recvmsg
>   kernel_recvmsg
>   netlink_recvmsg
>   packet_recvmsg
>   ping_recvmsg
>   raw_recvmsg
>   rawv6_recvmsg
>   rng_recvmsg
>   security_socket_recvmsg
>   selinux_socket_recvmsg
>   skcipher_recvmsg
>   sock_common_recvmsg
>   sock_no_recvmsg
>   sock_recvmsg
>   sys_recvmsg
>   tcp_recvmsg
>   udp_recvmsg
>   udpv6_recvmsg
>   unix_dgram_recvmsg
>   unix_seqpacket_recvmsg
>   unix_stream_recvmsg
>   #
> 
> Without filters:
> 
>   # perf probe -F | tail -5
>   zswap_pool_create
>   zswap_pool_current
>   zswap_update_total_size
>   zswap_writeback_entry
>   zswap_zpool_param_set
>   #
>   # perf probe -F | wc -l
>   33311
>   #

Looks good to me! 

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thanks!

> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Wang Nan <wangnan0@...wei.com>
> Link: http://lkml.kernel.org/n/tip-tc6y64i698cddufwe5ppn2k3@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/util/probe-event.c | 29 ++++++++++-------------------
>  1 file changed, 10 insertions(+), 19 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 28733962cd80..0bed2ee16292 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -3289,24 +3289,10 @@ out:
>  	return ret;
>  }
>  
> -/* TODO: don't use a global variable for filter ... */
> -static struct strfilter *available_func_filter;
> -
> -/*
> - * If a symbol corresponds to a function with global binding and
> - * matches filter return 0. For all others return 1.
> - */
> -static int filter_available_functions(struct map *map __maybe_unused,
> -				      struct symbol *sym)
> -{
> -	if (strfilter__compare(available_func_filter, sym->name))
> -		return 0;
> -	return 1;
> -}
> -
>  int show_available_funcs(const char *target, struct strfilter *_filter,
>  					bool user)
>  {
> +        struct rb_node *nd;
>  	struct map *map;
>  	int ret;
>  
> @@ -3324,9 +3310,7 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
>  		return -EINVAL;
>  	}
>  
> -	/* Load symbols with given filter */
> -	available_func_filter = _filter;
> -	ret = map__load(map, filter_available_functions);
> +	ret = map__load(map, NULL);
>  	if (ret) {
>  		if (ret == -2) {
>  			char *str = strfilter__string(_filter);
> @@ -3343,7 +3327,14 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
>  
>  	/* Show all (filtered) symbols */
>  	setup_pager();
> -	dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
> +
> +        for (nd = rb_first(&map->dso->symbol_names[map->type]); nd; nd = rb_next(nd)) {
> +		struct symbol_name_rb_node *pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
> +
> +		if (strfilter__compare(_filter, pos->sym.name))
> +			printf("%s\n", pos->sym.name);
> +        }
> +
>  end:
>  	if (user) {
>  		map__put(map);
> -- 
> 2.7.4
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>