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From: Steven Rostedt <rostedt@goodmis.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: werner <w.landgraf@ru.ru>,
	akpm@linux-foundation.org, hannes@cmpxchg.org,
	idryomov@gmail.com, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org,
	Minchan Kim <minchan.kim@gmail.com>,
	Johannes Weiner <jweiner@redhat.com>
Subject: Re: 2.6.38-rc1 problems with khugepaged
Date: Fri, 21 Jan 2011 16:14:02 -0500	[thread overview]
Message-ID: <1295644442.12215.4482.camel@gandalf.stny.rr.com> (raw)
In-Reply-To: <20110121191757.GO9506@random.random>

[ annoying plug ]

On Fri, 2011-01-21 at 20:17 +0100, Andrea Arcangeli wrote:
> On Fri, Jan 21, 2011 at 06:43:44AM -0400, werner wrote:
> > 2.6.38-rc1-git1 runs normally with khugepaged switched 
> > OFF.  Thus, khugepaged  is the problem; as said if 
> > switched it on, during boot the computer becomes very slow 
> > and sticks almost.    wl
> 
> Sorry, looks like x86 32bit THP wasn't tested in all possible .config
> (32bit support is upstream-only feature and because of lower userbase
> it also got a lot less testing than 64bit support).
> 
> Does it make any difference if you both disable CONFIG_PARAVIRT and
> enable HIGHMEM64?
> 
> For now keep THP off on 32bit, it should be trivial to reproduce so
> fix will come soon.
> 
> Minchan info shows it's an 32bit arch bug so don't be too worried
> about it because it can't affect 64bit builds and it's not common code
> bug and we'll fix it ASAP.

Just want to mention that ktest.pl was included in this release, just
for this purpose :)

It does randconfigs (and other nice features) and will test various
kernels. All you need is to have a test machine that can be remotely
booted and have its console read via stdio from another machine.

This happened to be how I triggered the bug.

I would be happy to help anyone set it up. The config I used to test my
box to do 10 runs of randconfig with a minimal config to make it boot,
and then 10 runs of randconfig with the minimal config to make it boot
and enable networking:

-----
MACHINE = mitest

# The TEST_START can override most defaults

# do ten boot tests (minimum forced config settings as possible)
TEST_START ITERATE 10
TEST_TYPE = boot
BUILD_TYPE = randconfig
MIN_CONFIG = /home/rostedt/work/autotest/configs/mitest/config-mitest-min
CHECKOUT = origin/master

# do ten boot and ssh hackbench tests (need network configs set)
TEST_START ITERATE 10
TEST_TYPE = TEST
BUILD_TYPE = randconfig
MIN_CONFIG = /home/rostedt/work/autotest/configs/mitest/config-mitest-net
CHECKOUT = origin/master
TEST = ssh root@mitest /work/c/hackbench_32 50


# defaults to use when watching test (SKIP will make ktest ignore it)
DEFAULTS SKIP
REBOOT_ON_ERROR = 1
POWEROFF_ON_ERROR = 0
POWEROFF_ON_SUCCESS = 0
REBOOT_ON_SUCCESS = 1
DIE_ON_FAILURE = 1

#defaults to kick off at night, and shut down at the end
DEFAULTS
REBOOT_ON_ERROR = 0
POWEROFF_ON_ERROR = 1
POWEROFF_ON_SUCCESS = 1
REBOOT_ON_SUCCESS = 0
DIE_ON_FAILURE = 0
STORE_FAILURES = /home/rostedt/work/autotest/nobackup/failures

# defaults for all tests
DEFAULTS
POWEROFF_AFTER_HALT = 60
CLEAR_LOG = 1
MIN_CONFIG = /home/rostedt/work/autotest/configs/mitest/config-mitest-min
SSH_USER = root
BUILD_DIR = /home/rostedt/work/autotest/nobackup/linux-test.git
OUTPUT_DIR = /home/rostedt/work/autotest/nobackup/mitest
BUILD_TARGET = arch/x86/boot/bzImage
TARGET_IMAGE = /boot/vmlinuz-test
POWER_CYCLE = /home/rostedt/work/autotest/cycle-mxtest
CONSOLE = nc -d fedora 3001
LOCALVERSION = -test
GRUB_MENU = Test Kernel
MAKE_CMD = distmake-32 ARCH=i386
POWER_OFF = /home/rostedt/work/autotest/poweroff-mxtest
BUILD_OPTIONS = -j20
LOG_FILE = /home/rostedt/work/autotest/nobackup/mitest/mitest.log
TEST = ssh root@mitest cat /debug/tracing/trace
ADD_CONFIG = /home/rostedt/work/autotest/configs/config-broken /home/rostedt/work/autotest/config-general
-----


-- Steve



  reply	other threads:[~2011-01-21 21:14 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-21 10:43 werner
2011-01-21 19:17 ` Andrea Arcangeli
2011-01-21 21:14   ` Steven Rostedt [this message]
2011-01-22  2:12   ` [PATCH] thp: fix PARAVIRT x86 32bit noPAE Andrea Arcangeli
2011-01-22  3:18     ` Minchan Kim
  -- strict thread matches above, loose matches on Subject: below --
2011-01-21  8:36 2.6.38-rc1 problems with khugepaged werner
2011-01-19 13:45 werner
2011-01-19 15:59 ` Borislav Petkov
2011-01-19 19:55   ` Andrea Arcangeli
2011-01-19 21:45   ` Johannes Weiner
2011-01-20  0:01     ` Andrea Arcangeli
2011-01-20  1:10       ` Johannes Weiner
2011-01-20  1:21         ` Andrea Arcangeli
2011-01-19 22:21   ` Andrea Arcangeli
2011-01-20 20:13     ` Steven Rostedt

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