[libbsd 00/22] Remove FreeBSD file descriptors and avoid VFS

[Sebastian Huber]

On 29/08/2022 10:27, Sebastian Huber wrote:
> Hello Chris,
> 
> On 25/07/2022 08:12, Sebastian Huber wrote:
>> On 11/07/2022 15:04, Sebastian Huber wrote:
>>> On 24/06/2022 08:33, Sebastian Huber wrote:
>>>> This patch set removes the FreeBSD file descriptors.  The VFS is no 
>>>> longer used
>>>> if only the USB, SD/MMC, network, PCI, and NVMe support is used by the
>>>> application.  This change significantly reduce the memory usage of 
>>>> LibBSD for
>>>> these applications.  Using the media01 test case for the arm/lpc32xx 
>>>> BSP as a
>>>> benchmark, the heap usage dropped from 14.3MiB to 10.2MiB.  The "_BSD
>>>> bufdaemon", "_BSD vnlru", "_BSD syncer", and "_BSD bufspacedaemon-" 
>>>> tasks are
>>>> no longer present in media01.  The code size is reduced by about 
>>>> 8KiB.  The
>>>> data size is reduced by about 30KiB.  The throughput with a simple 
>>>> FTP test
>>>> increased by about 1%.
>>>>
>>>> The "Remove FreeBSD file descriptors" change removes more lines than 
>>>> there are
>>>> added.
>>>>
>>>> This change makes it easier to port the NFS support to the master 
>>>> branch since
>>>> now the changes are more localized.
>>>
>>> I have a target with only 8MiB of RAM (for code and data). So, this 
>>> patch set is not just a micro optimization.
>>
>> This pending patch set is currently a blocker for me. I would like to 
>> work on the NTP daemon integration and an update of the libbsd master 
>> branch to a more recent FreeBSD version. This patch set just restores 
>> what worked well for several years.
> 
> did you have time to review this patch set in the meantime? The NTP 
> client no longer crashes with this patch set.

This patch set is now pending for about four months. From my point of 
view it is a straight forward fix of some severe issues which prevent 
the use of libbsd on lower end targets. It is not really good if our 
internal libbsd branches diverge too much from the RTEMS mainline.

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