Re: [patch] sched: fix scheduling latencies for !PREEMPT kernels

William Lee Irwin III
2004-09-15T02:36:36Z

On Tue, 2004-09-14 at 21:46, William Lee Irwin III wrote:
>> I've not heard a peep about anyone trying to fix this. It should be
>> killed off along with the rest, of course, but like I said before, it's
>> the messiest, dirtiest, and ugliest code that's left to go through,
>> which is why it's been left for last. e.g. driver ->ioctl() methods.

On Tue, Sep 14, 2004 at 10:00:44PM -0400, Lee Revell wrote:
> Andrew tried to fix this a few times in 2.4 and it broke the FS in
> subtle ways. Don't have an archive link but the message is
> <20040712163141.31ef1ad6.akpm@osdl.org>. I asked Hans directly about it
> and he said "balancing makes it hard, the fix is reiser4", see
> <411925FA.2000303@namesys.com>.

I have neither of these locally. I suspect someone needs to care enough
about the code for anything to happen soon. I suppose there are things
that probably weren't tried, e.g. auditing to make sure dependencies on
external synchronization are taken care of, removing implicit sleeping
with the BKL held, then punt a private recursive spinlock in reiser3's
direction. Not sure what went on, or if I want to get involved in this
particular case.

-- wli