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

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Date:	Tue, 12 Jan 2016 12:39:24 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, 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 Tue, Jan 12, 2016 at 12:34:35PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 11, 2016 at 10:18:20AM +0100, Jiri Olsa escreveu:
> > On Sat, Jan 09, 2016 at 07:16:29PM +0900, Namhyung Kim wrote:
> > > +		help = perf_tip(DOCDIR);
> > > +		if (help == NULL)
> > > +			help = "Cannot load tips.txt file, please install perf!";
> > > +	}
> > 
> > hum, I can't get this one.. seems like perf_tip does
> > not retun NULL if there's no tip.txt file
> 
> Neither me, fixing it up, this fallback will never take place.

With this patch on top, it works:

[root@...icio ~]# perf trace --no-inherit -e access perf report --stdio
     0.094 ( 0.017 ms): access(filename: /etc/ld.so.preload, mode: R                          ) = -1 ENOENT No such file or directory
     1.940 ( 0.008 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     1.979 ( 0.004 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     2.000 ( 0.004 ms): access(filename: /home/acme/etc/perfconfig, mode: R                   ) = -1 ENOENT No such file or directory
     2.177 ( 0.006 ms): access(filename: /usr/bin/pager, mode: X                              ) = -1 ENOENT No such file or directory
     2.189 ( 0.011 ms): access(filename: /usr/bin/less, mode: X                               ) = 0
    17.250 ( 0.018 ms): access(filename: /home/acme/share/doc/perf-tip/tips.txt               ) = -1 ENOENT No such file or directory
    17.259 ( 0.006 ms): access(filename: /home/acme/git/linux/tools/perf/Documentation/tips.txt) = 0
# 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: To see callchains in a more compact form: perf report -g folded)
#
[root@...icio ~]#