Re: [PATCH 0/5] Rewrite Motorola MMU page-table layout

Michael Schmitz
2020-01-30T19:12:31Z

Peter,

On 30/01/20 9:16 PM, Peter Zijlstra wrote:
> Hi Michael,
>
> On Thu, Jan 30, 2020 at 08:31:13PM +1300, Michael Schmitz wrote:
>
>> Not much difference:
>>
>> total used free shared buffers cached
>> Mem: 10712 10120 592 0 1860 2276
>> -/+ buffers/cache: 5984 4728
>> Swap: 2097144 1552 2095592
>>
>>
>> vs. vanilla 5.5rc5:
>> total used free shared buffers cached
>> Mem: 10716 10104 612 0 1588 2544
>> -/+ buffers/cache: 5972 4744
>> Swap: 2097144 1296 2095848
>>
>> By sheer coincidence, the boot with your patch series happened to run a full
>> filesystem check on the root filesystem, so I'd say it got a good workout
>> re: paging and swapping (even though it's just a paltry 4 GB).
> Sweet!, can I translate this into a Tested-by: from you?

If the test coverage is sufficient, you may certainly do that.

Cheers,

Michael

>
>> Haven't tried any VM stress testing yet (not sure what to do for that; it's
>> been years since I tried that sort of stuff).
> I think, this not being SMP, doing what you just did tickled just about
> everything there is.
>
> There is one more potential issue with MMU-gather / TLB invalidate on
> m68k (and a whole bunch of other archs) and I have patches for that
> (although I now need to redo the m68k one.
>
> Meanwhile the build robot gifted me with a build issue, and Will had
> some nitpicks, so I'll go respin and repost these patches.