Messages in this thread | | | Date | Tue, 30 Sep 2014 12:05:10 -0400 | From | Dave Jones <> | Subject | Re: pipe/page fault oddness. |
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On Tue, Sep 30, 2014 at 08:52:08AM -0700, Linus Torvalds wrote:
> So if it's looping on that fault, what seems to happen is that the > page fault keeps happening. > > Can you recreate this? Because if you can, please try to revert commit > e4a1cc56e4d7 ("x86: mm: drop TLB flush from ptep_set_access_flags"). > Maybe the TLB has it read-only, and it doesn't get flushed, and the > page fault happens over and over again.
I left it spinning overnight in case someone wanted me to probe it further, so I haven't tried reproducing it yet. It took ~12 hours yesterday before it got in that state. I'll restart it, and tell it to only use pipe fd's, which might speed things up a little.
If I can reproduce it, I'll then try that revert.
> What kind of CPU is the problematic machine? There was some question > about just how architectural the whole "TLB entry causing a page fault > gets invalidated automatically" really is.
model name : Intel(R) Core(TM) i5-4670T CPU @ 2.30GHz
Dave
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