linux-kernel - Re: [PATCH 4/4] perf tools: Fallback to srcdir/Documentation/tips.txt

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Date:	Tue, 12 Jan 2016 12:22:56 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 4/4] perf tools: Fallback to srcdir/Documentation/tips.txt

Em Sat, Jan 09, 2016 at 07:16:29PM +0900, Namhyung Kim escreveu:
> Some people don't install perf, but just use compiled version in the
> source.  Fallback to lookup the source directory for those poor guys. :)
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

So, after applying this I tried:

  $ rm -f ~/share/doc/perf-tip/tips.txt

  To make it fallback and:

  $ perf report --stdio | tail -3
  #
  # (Tip: get more memory! ;-p)
  #
  $ 

Doesn't work, looking at what it is trying to find:

  # perf trace --no-inherit -e access perf report --stdio
     0.090 ( 0.010 ms): access(filename: /etc/ld.so.preload, mode: R                          ) = -1 ENOENT No such file or directory
     2.013 ( 0.014 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     2.045 ( 0.004 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     2.076 ( 0.005 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     2.239 ( 0.006 ms): access(filename: /usr/bin/pager, mode: X                              ) = -1 ENOENT No such file or directory
     2.244 ( 0.004 ms): access(filename: /usr/bin/less, mode: X                               ) = 0
    16.969 ( 0.018 ms): access(filename: /home/acme/share/doc/perf-tip/tips.txt               ) = -1 ENOENT No such file or directory
  # To display the perf.data header info, please use --header/--header-only options.
  # 
  #
  # Total Lost Samples: 0
  #
  # Samples: 5  of event 'cycles:pp'
  # Event count (approx.): 24954605
  #
  # Overhead  Command  Shared Object     Symbol                   
  # ........  .......  ................  .........................
  #
    99.68%  usleep   [kernel.vmlinux]  [k] vma_rb_erase         
     0.32%  perf     [kernel.vmlinux]  [k] nmi_cpu_backtrace    
     0.00%  perf     [kernel.vmlinux]  [k] native_write_msr_safe

  #
  # (Tip: get more memory! ;-p)
  #
  #


Also you're not just fallbacking, you did this other unrelated change, no?

-     const char *help = perf_tip(TIPDIR);
+     const char *help = perf_tip(system_path(TIPDIR));


Investigating...

> ---
>  tools/perf/builtin-report.c | 10 +++++++++-
>  tools/perf/util/util.c      | 11 ++++++-----
>  2 files changed, 15 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
> index d5a42ee12529..2bf537f190a0 100644
> --- a/tools/perf/builtin-report.c
> +++ b/tools/perf/builtin-report.c
> @@ -28,6 +28,7 @@
>  #include "util/tool.h"
>  
>  #include <subcmd/parse-options.h>
> +#include <subcmd/exec-cmd.h>
>  #include "util/parse-events.h"
>  
>  #include "util/thread.h"
> @@ -433,7 +434,14 @@ static int report__browse_hists(struct report *rep)
>  	int ret;
>  	struct perf_session *session = rep->session;
>  	struct perf_evlist *evlist = session->evlist;
> -	const char *help = perf_tip(TIPDIR);
> +	const char *help = perf_tip(system_path(TIPDIR));
> +
> +	if (help == NULL) {
> +		/* fallback for people who don't install perf ;-) */
> +		help = perf_tip(DOCDIR);
> +		if (help == NULL)
> +			help = "Cannot load tips.txt file, please install perf!";
> +	}
>  
>  	switch (use_browser) {
>  	case 1:
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 88b8f8d21f58..92e8543dadf9 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -17,7 +17,6 @@
>  #include <unistd.h>
>  #include "callchain.h"
>  #include "strlist.h"
> -#include <subcmd/exec-cmd.h>
>  
>  struct callchain_param	callchain_param = {
>  	.mode	= CHAIN_GRAPH_ABS,
> @@ -672,14 +671,16 @@ const char *perf_tip(const char *dirpath)
>  	struct str_node *node;
>  	char *tip = NULL;
>  	struct strlist_config conf = {
> -		.dirname = system_path(dirpath) ,
> +		.dirname = dirpath,
> +		.file_only = true,
>  	};
>  
>  	tips = strlist__new("tips.txt", &conf);
> -	if (tips == NULL || strlist__nr_entries(tips) == 1) {
> -		tip = (char *)"Cannot find tips.txt file";
> +	if (tips == NULL)
> +		return "Tip: get more memory! ;-p";
> +
> +	if (strlist__nr_entries(tips) == 0)
>  		goto out;
> -	}
>  
>  	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
>  	if (asprintf(&tip, "Tip: %s", node->s) < 0)
> -- 
> 2.6.4