linux-kernel - Re: [PATCH 3/3] perf, tools: Add support for guest/host-only profiling

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: <20110510150821.GC30996@amd.com>
Date:	Tue, 10 May 2011 17:08:21 +0200
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/3] perf, tools: Add support for guest/host-only
 profiling

On Tue, May 10, 2011 at 10:50:08AM -0400, Peter Zijlstra wrote:
> On Tue, 2011-05-10 at 16:35 +0200, Joerg Roedel wrote:
> > @@ -740,6 +740,12 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr)
> >                         if (!exclude)
> >                                 exclude = eu = ek = eh = 1;
> >                         eh = 0;
> > +               } else if (*str == 'G') {
> > +                       eg   = 0;
> > +                       ehst = 1;
> > +               } else if (*str == 'H') {
> > +                       eg   = 1;
> > +                       ehst = 0; 
> 
> This doesn't match the existing exclude logic, also eH and eG come to
> mind.

OK, eH and eG seems like a better choice. Regarding the logic I
explictly decided to do it this way. The reason is that guest/host
counting is orthogonal to user/kernel/hv counting. You can decide to
only count guest-kernel for example. And if a user just specifies
-e cycles:G this would automatically exlucde user and kernel counting.
This didn't make sense to me so I decided to keep the logic seperate for
guest/host exclusions.

	Joerg


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/