Re: [kvm-unit-tests RFC PATCH 06/19] lib/alloc_phys: Remove allocation accounting

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On Tue, Aug 09, 2022 at 10:15:45AM +0100, Alexandru Elisei wrote:
> The page allocator has better allocation tracking and is used by all
> architectures, while the physical allocator is now never used for
> allocating memory.
> 
> Simplify the physical allocator by removing allocation accounting. This
> accomplishes two things:
> 
> 1. It makes the allocator more useful, as the warning that was displayed
> each allocation after the 256th is removed.
> 
> 2. Together with the lock removal, the physical allocator becomes more
> appealing as a very early allocator, when using the page allocator might
> not be desirable or feasible.

How does the locking cause problems when used in an early allocator?

> 
> Also, phys_alloc_show() has received a slight change in the way it displays
> the use and free regions: the end of the region is now non-inclusive, to
> allow phys_alloc_show() to express that no memory has been used, or no
> memory is free, in which case the start and the end adresses are equal.
> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei@xxxxxxx>
> ---
>  lib/alloc_phys.c | 65 ++++++++++++++----------------------------------
>  lib/alloc_phys.h |  5 ++--
>  2 files changed, 21 insertions(+), 49 deletions(-)
>

Reviewed-by: Andrew Jones <andrew.jones@xxxxxxxxx>
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