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

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Peter,

Am 30.01.2020 um 08:31 schrieb Peter Zijlstra:
On Thu, Jan 30, 2020 at 07:52:11AM +1300, Michael Schmitz wrote:
Peter,

On Thu, Jan 30, 2020 at 12:54 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

On Wed, Jan 29, 2020 at 11:49:13AM +0100, John Paul Adrian Glaubitz wrote:

[1] https://wiki.debian.org/M68k/QemuSystemM68k

Now, if only debian would actually ship that :/

AFAICT that emulates a q800 which is another 68040 and should thus not
differ from ARAnyM.

I'm fairly confident in the 040 bits, it's the 020/030 things that need
coverage.

I'll take a look - unless this eats up way more kernel memory for page
tables, it should still boot on my Falcon.

It should actually be better in most cases I think, since we no longer
require all 16 pte-tables to map consecutive (virtual) memory.

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).

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).

Cheers,

	Michael





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