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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
