Re: AIM7 40% regression with 2.6.26-rc1

[Andrew Morton]

On Wed, 07 May 2008 11:41:52 +0800 "Zhang, Yanmin" <yanmin_zhang@xxxxxxxxxxxxxxx> wrote:

> As system idle is more than 50%, so the schedule/schedule_timeout caller is important
> information.
> 1) lock_kernel causes most schedule/schedule_timeout;
> 2) When lock_kernel calls down, then __down, __down calls ___schedule_timeout for
> lots of times in a loop;

Really?  Are you sure?  That would imply that we keep on waking up tasks
which then fail to acquire the lock.  But the code pretty plainly doesn't
do that.

Odd.

> 3) Caller of lcok_kernel are sys_fcntl/vfs_ioctl/tty_release/chrdev_open.

Still :(
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