[haiku-commits] Re: r36489 - in haiku/trunk: headers/private/kernel/vm src/system/kernel/vm
- From: Stephan Assmus <superstippi@xxxxxx>
- To: haiku-commits@xxxxxxxxxxxxx
- Date: Mon, 26 Apr 2010 16:16:32 +0200
On 2010-04-26 at 15:56:09 [+0200], ingo_weinhold@xxxxxx wrote:
> Author: bonefish
> Date: 2010-04-26 15:56:09 +0200 (Mon, 26 Apr 2010)
> New Revision: 36489
> Changeset: http://dev.haiku-os.org/changeset/36489/haiku
>
> Modified:
> haiku/trunk/headers/private/kernel/vm/vm_page.h
> haiku/trunk/src/system/kernel/vm/vm_page.cpp
> Log:
> * The "page_stats" command does now also print the longest contiguous runs
> of
> free respective free and cached pages.
> * Removed the unused vm_page_allocate_page_run_no_base().
> * vm_page_allocate_page_run() (and allocate_page_run()):
> - Use vm_page_reserve_pages() instead of vm_page_try_reserve_pages(), i.e.
> wait until the reservation succeeds.
> - Now we iterates two times through the pages to find a suitable page
> run. In
> the first iteration it only looks for free/clear pages, in the second
> iteration it also considers cached pages. This increases the chance of
> the
> function to succeed, when a lot of caching is going on.
> This reduces the amount of memory required to use the IOCache when
> booting
> off the anyboot Live CD to around 160 MB in qemu. It also seems to work
> with
> 128 MB, but the syslog indicates that some memory allocations fail,
> which
> is not exactly inspiring confidence.
As a last resort, using the IOCache could become a run-time configuration
that depends on the amount of available memory.
On a related note, I just found out that booting a regular QEMU image with
128 MB RAM, launching WebPositive will fail. It could also be a result of the
library and executable "pre-caching" that Axel and I introduced for the last
alpha. Perhaps both problems even relate somehow, i.e. maybe using the
IOCache at 128 MB RAM stops being a problem if the pre-caching is turned off,
which in turn is not necessary anymore when the IOCache is used.
Best regards,
-Stephan
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