Re: VFS: file-max limit 50044 reached

[Dipankar Sarma <dipankar@in.ibm.com>]

On Mon, Oct 17, 2005 at 09:16:25AM -0700, Linus Torvalds wrote:
> 
> > Absolutely. Keeping a count of (percpu) queued items is basically free if kept
> > in the cache line used by list head, so the 'queue length on this cpu' is a
> > cheap metric.
> 
> The only downside to TIF_RCUUPDATE is that those damn TIF-flags are 
> per-architecture (probably largely unnecessary, but while most 
> architectures don't care at all, others seem to have optimized their 
> layout so that they can test the work bits more efficiently). So it's a 
> matter of each architecture being updated with its TIF_xyz flag and their 
> work function.
> 
> Anybody willing to try? Dipankar apparently has a lot on his plate, this 
> _should_ be fairly straightforward. Eric?

I *had*, when this hit me :) It was one those spurt things. I am going to
look at this, but I think we will need to do this with some careful
benchmarking.

At the moment however I do have another concern - open/close taking too
much time as I mentioned in an earlier email. It is nearly 4 times
slower than 2.6.13. So, that is first up in my list of things to
do at the moment.

Thanks
Dipankar