linux-kernel - Re: [perfmon] Re: [perfmon2] perfmon2 merge news

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: <20071113212902.GA17593@one.firstfloor.org>
Date:	Tue, 13 Nov 2007 22:29:02 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephane Eranian <eranian@....hp.com>
Cc:	William Cohen <wcohen@...hat.com>, akpm@...l.org,
	Robert Richter <robert.richter@....com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, perfmon@...ali.hpl.hp.com,
	Andi Kleen <andi@...stfloor.org>,
	perfmon2-devel@...ts.sourceforge.net
Subject: Re: [perfmon] Re: [perfmon2] perfmon2 merge news

On Tue, Nov 13, 2007 at 01:13:45PM -0800, Stephane Eranian wrote:
> Oprofile does not setup the PMU interrupt. It builds on top of the NMI watchdog
> setup.

Oprofile works without the NMI watchdog too, but it just happens to be another
NMI user.

> It uses the register_die() mechanism, 

Not correct.

> if I recall. The low level APIC
> and gate is setup elsewhere. Perfmon does not use NMI, unless forced to because
> of the NMI watchdog. 

It could handle it in the same way as oprofile if it wanted. But given
NMIs make everything more complicated and it might not be worth it.

-Andi
-
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/