sched behaviour (was: Re: linux-next: Tree for January 26)

[Andrew Morton]

On Mon, 26 Jan 2009 19:23:49 +1100
Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:

> I have created today's linux-next tree at
> git://git.kernel.org/pub/scm/linux/kernel/git/sfr/linux-next.git

The machine is 8-way x86_64.  In one window it is running `make -j32
vmlinux'.

In another window I run the `fpatch' command.  fpatch is a scruffy
shell script from
http://userweb.kernel.org/~akpm/stuff/patch-scripts.tar.gz which does a
few mv's, cp's, etc.


current mainline:

akpm2:/usr/src/25> time fpatch b kernel/sched.c
fpatch b kernel/sched.c  0.02s user 0.09s system 33% cpu 0.338 total

Jan 26 linux-next:

akpm2:/usr/src/25> time fpatch b kernel/sched.c
fpatch b kernel/sched.c  0.02s user 0.05s system 0% cpu 32.739 total


Machine basically unusable, user unhappy!

I'm assuming it's a scheduler problem - everything is in pagecache.
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