linux-kernel - Re: [RFC V2 1/3] perf, tools: Support wildcards on pmu name in dynamic pmu events

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]

Message-ID: <1ddac3f4900267b0c9a69ef4c598be51@codeaurora.org>
Date:   Mon, 05 Mar 2018 10:08:18 -0500
From:   Agustin Vega-Frias <agustinv@...eaurora.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>, timur@...eaurora.org
Subject: Re: [RFC V2 1/3] perf, tools: Support wildcards on pmu name in
 dynamic pmu events

On 2018-03-04 13:10, Jiri Olsa wrote:
> On Sun, Mar 04, 2018 at 09:12:45AM -0800, Andi Kleen wrote:
>> > > +#include <fnmatch.h>
>> > >  #include <linux/compiler.h>
>> > >  #include <linux/list.h>
>> > >  #include <linux/types.h>
>> > > @@ -241,7 +242,7 @@ PE_NAME opt_event_config
>> > >  			if (!strncmp(name, "uncore_", 7) &&
>> > >  			    strncmp($1, "uncore_", 7))
>> > >  				name += 7;
>> > > -			if (!strncmp($1, name, strlen($1))) {
>> > > +			if (!strncmp($1, name, strlen($1)) || !fnmatch($1, name, 0)) {
>> >
>> > could we now get rid of the strncmp in here and keep the
>> > glob matching only?
>> 
>> That would break existing command lines. Not a good idea.
> 
> I hoped that only you guys are using this and would rewrite your 
> scripts ;-)
> 
> I had no idea there's fnmatch func before.. too bad, ok
> 
> jirka

An option to keep backward compatibility and consistency would be
to wrap the pattern/string passed in *'s, that way we can just use
fnmatch and have all the examples Jiri brought up work the same.
With that in place we can actually also drop the explicit ignoring
of the uncore_ prefix since the globbing would take care of that.

Thoughts?

Agustín

-- 
Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a 
Linux Foundation Collaborative Project.