linux-kernel - Re: [PATCH] sched: Provide iowait counters

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:	Sat, 25 Jul 2009 10:56:01 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"Kok, Auke-jan H" <auke-jan.h.kok@...el.com>
Subject: Re: [PATCH] sched: Provide iowait counters

Peter Zijlstra wrote:
> On Sat, 2009-07-25 at 09:42 -0700, Arjan van de Ven wrote:
>> In case you wonder why you need both tools, and can't just use one: we
>> wondered the same, but it turns out that if you only build
>> Tool Two, you don't get a good overview of what is going on on a
>> higher level. It's like looking at the world via a microscope all the
>> time,
> 
> I'd be thinking you could compose your ms based picture on the sample
> data. For instance, if you sample on cpu-clock at 100kHz, then a 100
> samples get you a full blue slice, 50 get you a 50% blue slice, etc.

we can compose part of it from the details (but there's a lot of details),
but not nearly all of it, things like the IO bandwidth etc we just can't
do this with.

we could do this for cpu use to a large degree though I suppose

--
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/