Re: [PATCH 0/9] Containers (V9): Generic Process Containers

From: Paul Jackson
Date: Sun Apr 29 2007 - 05:37:45 EST

I'm afraid that this patch set doesn't do cpusets very well.

It builds and boots and mounts the cpuset file system ok.
But trying to write the 'mems' file hangs the system hard.

I had to test it against 2.6.21-rc7-mm2, because I can't boot
2.6.21-rc7-mm1, due to the 'bad_page' problem that I noted in an
earlier post this evening on lkml.

These container patches seemed to apply ok against 2.6.21-rc7-mm2,
and built and booted ok. I built with an sn2_defconfig configuration,
having the following CONTAINER and CPUSET settings:


I could mount the cpuset file system on /dev/cpuset just fine.

Then I invoked the following commands:

# cd /dev/cpuset
# mkdir foo
# cd foo
# echo 0-3 > cpus
# echo 0-1 > mems

At that point, the system hangs. Reproduced three times, on two boots.
I never get a shell prompt back from that second echo. I have to hit
Reset. The three different hangs were done with the following three
different values:

echo 0-3 > mems
echo 0-1 > mems
echo 1 > mems

On that last one, "echo 1 > mems", I did not do the echo to cpus first.

The test system had 8 cpus, numbered 0-7, and 4 mems, numbered 0-3.

I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@xxxxxxx> 1.925.600.0401
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at