linux-kernel - RE: [RFC][PATCH v2 5/5] mutex: Give spinners a chance to spin_on_owner if need

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Date:	Thu, 6 Feb 2014 20:10:02 +0000
From:	"Norton, Scott J" <scott.norton@...com>
To:	"Long, Wai Man" <waiman.long@...com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	"Low, Jason" <jason.low2@...com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Bueso, Davidlohr" <davidlohr@...com>,
	"hpa@...or.com" <hpa@...or.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"Chandramouleeswaran, Aswin" <aswin@...com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: RE: [RFC][PATCH v2 5/5] mutex: Give spinners a chance to
 spin_on_owner if need_resched() triggered while queued

>> I run the patch through the AIM7 high-systime workload on a
>> 4-socket server and it seemed to run fine.
> How do people run this AIM7 piece of shit? I let it run for over an hour
> and it generated exactly 0 numbers, it just sits there eating cpu-time
> and creating a racket from my pantry.

./reaim -s100  -e2000 -t -j100 -i100 -f workfile.high_systime

The reaim.config file contains:

FILESIZE 10k
POOLSIZE 1m
DISKDIR /t0
DISKDIR /t1
DISKDIR /t2
DISKDIR /t3
DISKDIR /t4
DISKDIR /t5
DISKDIR /t6
DISKDIR /t7
DISKDIR /t8
DISKDIR /t9
DISKDIR /t10
DISKDIR /t11
DISKDIR /t12
DISKDIR /t13
DISKDIR /t14
DISKDIR /t15

The way Longman uses this is to create 16 ramdisk filesystems through
/dev/ram* and then mount those filesystems to the /t* directories.
Although you could run it through a regular filesystem also. It will use
whatever you place in the reaim.config file as DISKDIR. You can specify
one or more DISKDIR directories.


Scott

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