Re: [PATCH] mm: fix up a spurious page fault whenever it happens

From: Stanislav Meduna
Date: Wed Jun 19 2013 - 03:36:59 EST

On 19.06.2013 07:20, Linus Torvalds wrote:

>> No crash in 2 days running with preempt none...
> Is this UP?

Yes it is.

> There's the fast_tlb race that Peter fixed in commit 29eb77825cc7
> ("arch, mm: Remove tlb_fast_mode()"). I'm not seeing how it would
> cause infinite TLB faults, but it definitely causes potentially
> incoherent TLB contents. And afaik it only happens with
> CONFIG_PREEMPT, and on UP systems. Which sounds like it might match
> your setup...

Oh, thank you for the pointer, this indeed looks interesting.

Unfortunately the patch massively does not apply to 3.4 which
I am using and I know too little what all is involved here
to backport it. I will test it when (if) it gets to the 3.4(-rt)
(or when I find some spare time to play with the newer kernel
on that system).


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