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Re: Page sizes

From Don Y <blockedofcourse@foo.invalid>
Newsgroups comp.arch.embedded
Subject Re: Page sizes
Date 2020-06-27 15:10 -0700
Organization A noiseless patient Spider
Message-ID <rd8g50$e2j$1@dont-email.me> (permalink)
References <rd6iuc$fkg$1@dont-email.me> <0mefffpilr3unrt19naquhucp21o0pqcua@4ax.com>

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Hi George,

Hope you are keeping well...  bad pandemic response, here; really
high temperatures; increasing humidity; and lots of smoke in the
air (but really cool "displays" at night!)  :<   Time to make some
ice cream and enjoy the ride!  :>

On 6/27/2020 2:37 PM, George Neuner wrote:
> Hi Don,
> On Fri, 26 Jun 2020 21:45:54 -0700, Don Y
> <blockedofcourse@foo.invalid> wrote:
> 
>> Are there any processors/PMMUs for which the following would be
>> true (nonzero)?
>>
>> (pagesize - 1) & pagesize
> 
> Not anything you can buy.

I'm wondering if some of the "classic" designs might scale to newer
device geometries better than some of the newer architectures?

E.g., supporting ~100 (variable sized) segments concurrently and
binding each to a particular "object" (for want of a better word).
If the segment management hardware automatically reloads (in a manner
similar to the TLBs functionality), then this should yield better
(or comparable) performance to the fixed page-size approach (if
you assume the fixed pages poorly "fit" the types of "objects"
that you are mapping)

[I think we discussed this -- or something similar -- a while ago]

You still have a "packing problem" but with a virtual address space
per process, you'd only have to address the "objects" with which a
particular process interacted in any particular address space.
And, that binding (for PIC) could be done at compile time *or*
load time (the latter being more flexible) -- or even RUN-time!

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Thread

Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-26 21:45 -0700
  Re: Page sizes Bernd Linsel <bl1@gmx.com> - 2020-06-27 08:33 +0200
    Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-27 00:32 -0700
      Re: Page sizes Bernd Linsel <bl1@gmx.com> - 2020-06-27 12:21 +0200
        Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-27 15:12 -0700
        Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-27 18:14 -0400
      Re: Page sizes David Brown <david.brown@hesbynett.no> - 2020-06-27 17:21 +0200
        Re: Page sizes Clifford Heath <no.spam@please.net> - 2020-06-28 15:30 +1000
      Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-27 18:02 -0400
  Re: Page sizes upsidedown@downunder.com - 2020-06-27 11:11 +0300
  Re: Page sizes John Speth <johnspeth@yahoo.com> - 2020-06-27 07:59 -0700
  Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-27 17:37 -0400
    Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-27 15:10 -0700
      Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-27 18:35 -0400
        Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-27 16:36 -0700
          Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-28 01:01 -0400
            Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-27 23:50 -0700
              Re: Page sizes upsidedown@downunder.com - 2020-06-28 13:27 +0300
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-28 11:49 -0700
              Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-30 00:05 -0400
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-29 23:24 -0700
                Re: Page sizes upsidedown@downunder.com - 2020-06-30 11:00 +0300
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-30 12:23 -0700
                Re: Page sizes upsidedown@downunder.com - 2020-07-01 13:31 +0300
                Re: Page sizes Dimiter_Popoff <dp@tgi-sci.com> - 2020-07-01 19:44 +0300
                Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-30 05:45 -0400
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-30 04:13 -0700
                Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-06-30 12:49 -0400
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-30 12:44 -0700
                Re: Page sizes George Neuner <gneuner2@comcast.net> - 2020-07-02 03:14 -0400
        Re: Page sizes upsidedown@downunder.com - 2020-06-28 09:24 +0300
          Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-28 00:11 -0700
            Re: Page sizes upsidedown@downunder.com - 2020-06-28 15:59 +0300
              Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-28 12:04 -0700
                Re: Page sizes upsidedown@downunder.com - 2020-06-30 06:43 +0300
                Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-29 23:47 -0700
          Re: Page sizes Rick C <gnuarm.deletethisbit@gmail.com> - 2020-06-28 01:18 -0700
            Re: Page sizes upsidedown@downunder.com - 2020-06-28 16:29 +0300
              Re: Page sizes Don Y <blockedofcourse@foo.invalid> - 2020-06-28 12:18 -0700
  Re: Page sizes Richard Damon <Richard@Damon-Family.org> - 2020-06-27 18:27 -0400
  Re: Page sizes Andrew Smallshaw <andrews@sdf.org> - 2020-07-04 06:11 +0000

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