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Re: Fwd: Hurd shutdown problems
From: |
Richard Braun |
Subject: |
Re: Fwd: Hurd shutdown problems |
Date: |
Fri, 12 Aug 2016 19:50:51 +0200 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Fri, Aug 12, 2016 at 07:08:07PM +0200, Samuel Thibault wrote:
> More precisely though, adding debugging to vm_page_load:
>
> vm_page_load 10000-1000000 10000-1000000
> vm_page_load 1000000-7a000000 114f000-79c41000
> vm_page_load 7a000000-7ffe0000 7a000000-7ffe0000
>
> I.e. it properly skips the kernel (1000000-114f000), but nothing else.
>
> What is supposed to exclude everything else? (modules, VGA BIOS, etc.)
Look at the vm_page_load calls and you'll see there is a range of
available pages inside each loaded region.
Here is how biosmem operates :
1/ biosmem_bootstrap is called. It sets the early allocator heap by
looking at each segment (dma, directmap and highmem if present).
Each segment and their associated heap is stored in biosmem_segments.
The biosmem heap is the heap with most available pages that can
be directly mapped by the kernel once paging is enabled. Other heaps
are of no interest after this.
2/ When using the early allocator (biosmem_bootalloc), a chunk of
contiguous pages is removed from the heap and given to the caller.
3/ When enabling the virtual memory system, biosmem_setup is called.
It loads each segment into the vm_page module, but is careful to clip
the biosmem heap from them. When loading a segment, the biosmem heap
part is passed as [avail_start, avail_end] to vm_page_load.
4/ Once the VM system is enabled, memory that wasn't part of the
heap is normally reserved, and can be made available by calling
vm_page_manage.
To properly answer your question, step 1/ is what looks at the boot
data (biosmem_find_boot_data) so that the resulting heap boundaries
completely exclude any.
--
Richard Braun
- Fwd: Hurd shutdown problems, (continued)
- Message not available
- Fwd: Hurd shutdown problems, Brent W. Baccala, 2016/08/08
- Re: Fwd: Hurd shutdown problems, Justus Winter, 2016/08/09
- Re: Fwd: Hurd shutdown problems, Brent W. Baccala, 2016/08/09
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/10
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/10
- Re: Fwd: Hurd shutdown problems, Brent W. Baccala, 2016/08/11
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems,
Richard Braun <=
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Brent W. Baccala, 2016/08/15
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Richard Braun, 2016/08/12
- Re: Fwd: Hurd shutdown problems, Samuel Thibault, 2016/08/12
Re: Hurd shutdown problems, Esa Peuha, 2016/08/07