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

From: Stanislav Meduna
Date: Thu Jun 20 2013 - 13:51:17 EST

On 19.06.2013 10:06, Peter Zijlstra wrote:

>> On 19.06.2013 07:20, Linus Torvalds wrote:
>>> 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...

> The easiest way to test for your system is to ensure tlb_fast_mode()
> return an unconditional 0.

Nope. Got the faults also with tlb_fast_mode() returning 0, this time
after ~10 hours. So there still has to be something...


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