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Subject: Re: svn commit: r328916 - in head/sys: kern vm
From: Andrew Turner <andrew@fubar.geek.nz>
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To: Gleb Smirnoff <glebius@FreeBSD.org>
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> On 6 Feb 2018, at 04:16, Gleb Smirnoff <glebius@FreeBSD.org> wrote:
>=20
> Author: glebius
> Date: Tue Feb  6 04:16:00 2018
> New Revision: 328916
> URL: https://svnweb.freebsd.org/changeset/base/328916
>=20
> Log:
>  Followup on r302393 by cperciva, improving calculation of boot pages =
required
>  for UMA startup.
>=20
>  o Introduce another stage of UMA startup, which is entered after
>    vm_page_startup() finishes. After this stage we don't yet enable =
buckets,
>    but we can ask VM for pages. Rename stages to meaningful names =
while here.
>    New list of stages: BOOT_COLD, BOOT_STRAPPED, BOOT_PAGEALLOC, =
BOOT_BUCKETS,
>    BOOT_RUNNING.
>    Enabling page alloc earlier allows us to dramatically reduce number =
of
>    boot pages required. What is more important number of zones becomes
>    consistent across different machines, as no MD allocations are done =
before
>    the BOOT_PAGEALLOC stage. Now only UMA internal zones actually need =
to use
>    startup_alloc(), however that may change, so vm_page_startup() =
provides
>    its need for early zones as argument.
>  o Introduce uma_startup_count() function, to avoid code duplication. =
The
>    functions calculates sizes of zones zone and kegs zone, and =
calculates how
>    many pages UMA will need to bootstrap.
>    It counts not only of zone structures, but also of kegs, slabs and =
hashes.
>  o Hide uma_startup_foo() declarations from public file.
>  o Provide several DIAGNOSTIC printfs on boot_pages usage.
>  o Bugfix: when calculating zone of zones size use (mp_maxid + 1) =
instead of
>    mp_ncpus. Use resulting number not only in the size argument to =
zone_ctor()
>    but also as args.size.

With this I=E2=80=99m getting "panic: UMA: Increase vm.boot_pages=E2=80=9D=
 on an arm64 simulator with 4GB of memory. I can increase vm.boot_pages =
manually, however this isn=E2=80=99t useful in the long term.

Andrew