linux-kernel - Re: [PATCH] perf, x86: Add workaround for MEM_*

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: <20130501101004.GA17360@gmail.com>
Date:	Wed, 1 May 2013 12:10:04 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, mingo@...e.hu,
	eranian@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf, x86: Add workaround for MEM_*_RETIRED errata BV98


* Andi Kleen <andi@...stfloor.org> wrote:

> Peter Zijlstra <peterz@...radead.org> writes:
> >
> > So you're saying that if two SMT siblings count the same MEM_*_RETIRED event
> > (on the same counter?) events can get accounted to the wrong sibling?
> 
> It can happen regardless of what event is enabled on the other counter.
> 
> > And when the other sibling doesn't have (the same counter?) enabled we
> > can loose events?
> 
> doesn't have any events enabled.
> 
> > This begs the question what happens when the sibling does have the (same?)
> > counter enabled but counting an all together different event; do we then still
> > 'loose' events from the one sibling and add then to the other counter?
> 
> Yes, that is what the patch fixes.
> 
> Of course only if you actually apply it, and not lose it as usual.

If your snide remark is referring to your pending Haswell patchset then 
you are dead wrong: the reason why they have not been picked up yet is not 
because they were ignored, but because they had to go through 11 review 
iterations already - still counting (!).

That is a huge amount of overhead on the maintainer side.

With such a negative track record you should not expect maintainers to 
fast-track your patches or trust your judgement too much - your patches 
are often sloppy, your changelogs incomplete or outright deceiving, your 
replies are often evasive and non-constructive.

Thanks,

	Ingo
--
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/