Messages in this thread | | | Subject | Re: [RFC PATCH 00/11] Avoid synchronous TLB invalidation for intermediate page-table entries on arm64 | From | Jon Masters <> | Date | Fri, 7 Sep 2018 02:36:08 -0400 |
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On 09/05/2018 08:28 AM, Will Deacon wrote: > On Tue, Sep 04, 2018 at 02:38:02PM -0400, Jon Masters wrote: >> On 08/24/2018 11:52 AM, Will Deacon wrote: >> >>> I hacked up this RFC on the back of the recent changes to the mmu_gather >>> stuff in mainline. It's had a bit of testing and it looks pretty good so >>> far. >> >> I will request the server folks go and test this. You'll probably >> remember a couple of parts we've seen where aggressive walker caches >> ended up (correctly) seeing stale page table entries and we had all >> manner of horrifically hard to debug problems. We have some fairly nice >> reproducers that were able to find this last time that we can test. > > Cheers, Jon, that would be very helpful. You're probably best off using > my (rebasing) tlb branch rather than picking the RFC: > > git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git tlb > > Let me know if you'd prefer something stable (I can tag it with a date).
That would be useful. I've prodded each of the Arm server SoC vendors I work with via our weekly call to have them each specifically check this. A tag would be helpful to that effort I expect. They all claim to be watching this thread now, so we'll see if they see cabbages here.
Jon.
-- Computer Architect | Sent from my Fedora powered laptop
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