Re: 2.6.15-rc5: latency regression vs 2.6.14 in exit_mmap->free_pgtables

[Hugh Dickins <hugh@veritas.com>]

On Wed, 18 Jan 2006, Lee Revell wrote:
> On Wed, 2005-12-28 at 22:59 +0000, Hugh Dickins wrote:
> > 
> > On my list to work on; but the TLB always needs great care, and this
> > goes down into architectural divergences, with truncation of a mapped
> > file adding further awkward constraints.  I imagine 2.6.16-rc1 is only
> > a couple of weeks away, so it's unlikely to be fixed in 2.6.16 either.
> 
> Is this believed to be fixed in 2.6.16-rc1?

Not at all, I'm afraid.  Do you think I ought to try to persuade Linus
and Andrew to take that ugly free_pgtables #ifdef CONFIG_PREEMPT patch
in the interim before we've the proper latency fix there?  (I doubt the
mmu_gather rewrite in 2.6.17 too, but perhaps a reasonable compromise.)

Hugh
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