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

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Message-ID: <20200130081623.GW14879@hirez.programming.kicks-ass.net>
Date:   Thu, 30 Jan 2020 09:16:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michael Schmitz <schmitzmic@...il.com>
Cc:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux/m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Development <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH 0/5] Rewrite Motorola MMU page-table layout


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?

> 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.