linux-kernel - Re: [PATCH 1/7] x86/intel_rdt: Intel Cache Allocation Technology detection

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: <20150225112153.GB3226@pd.tnic>
Date:	Wed, 25 Feb 2015 12:21:53 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Vikas Shivappa <vikas.shivappa@...el.com>
Cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, matt.fleming@...el.com,
	hpa@...or.com, tglx@...utronix.de, mingo@...nel.org, tj@...nel.org,
	peterz@...radead.org, will.auld@...el.com, dave.hansen@...el.com,
	andi.kleen@...el.com, tony.luck@...el.com, kanaka.d.juvva@...el.com
Subject: Re: [PATCH 1/7] x86/intel_rdt: Intel Cache Allocation Technology
 detection

On Tue, Feb 24, 2015 at 04:42:10PM -0800, Vikas Shivappa wrote:
> >>+
> >>+	pr_info("cbmlength:%u,Closs: %u\n", cbm_len, maxid);
> >
> >This text message needs to be much more user-friendly if it is going out
> >to the console unconditionally.
> >
> 
> bit mask lengh:  number of CLOSids: ? . it should print with the module name
> as well which should help understand what it is for.

Right, if I haven't read the SDM on RDT, I still don't understand what
those mean. What is the need for that message at all, what is it telling
me?

Can you show an example from a machine with RDT and explain what it is
good for?

> >>+config CGROUP_RDT
> >>+	bool "Resource Director Technology cgroup subsystem"
> >>+	depends on X86_64
> >
> >depends on X86_64 && CPU_SUP_INTEL
> >
> >Also, this should probably also depend on CGROUP-something or so
> >AFAICT...
> 
> This is with in the if CGROUPS

Right, but you still need the CPU_SUP_INTEL dependency as !Intel x86
doesn't need that code built.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--
--
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/