Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-07

[Ingo Molnar]

* Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> > could you send me your latest patch for the bit-spin issue? My main 
> > issue was cleanliness, so that the patch doesnt get stuck in the -RT 
> > tree forever.
> 
> I think that's the main problem. Without changing the design of the 
> ext3 system, I don't think there is a clean patch.  The implementation 
> that I finally settled down with was to make the j_state and 
> j_journal_head locks two global locks. I had to make a few 
> modifications to some spots to avoid deadlocks, but this worked out 
> well. The problem I was worried about was this causing too much 
> overhead. So the ext3 buffers would have to contend with each other. I 
> don't have any tests to see if this had too much of an impact.

yeah - i think Andrew said that a global lock at that particular place 
might not be that much of an issue.

	Ingo
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