linux-kernel - Re: [patch] perf: use proper dTLB-load-misses event on Ivybridge

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]

Date:	Wed, 16 Jul 2014 09:53:08 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Andi Kleen <ak@...ux.intel.com>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Stephane Eranian <eranian@...il.com>
Subject: Re: [patch] perf: use proper dTLB-load-misses event on Ivybridge

On Mon, 14 Jul 2014, Andi Kleen wrote:

> On Mon, Jul 14, 2014 at 03:33:25PM -0400, Vince Weaver wrote:
> > 
> > This was discussed back in February 
> > 	https://lkml.org/lkml/2014/2/18/956
> > But I never saw a patch come out of it.
> > 
> > On Ivybridge we share the Sandybridge cache event tables, but the
> > dTLB-load-miss event is not compatible.  Patch it up after
> > the fact to the proper DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK
> 
> There is much more wrong. I've been working on revamping the whole
> tables.

any ETA on that?

The whole concept of generic events making life easier for casual users 
goes out the window if we're going to let them run experiments with bogus 
events.

If the IVB events are wrong we should just zero them out and give ENOENT 
for the entire lot of them rather than pretend like the kernel has useful 
event definitions.

Vince
--
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/