[OpenWrt-Devel] [PATCH] config: enable some useful features on !SMALL_FLASH devices

[Daniel Golle]

Hi!

On Sun, Dec 30, 2018 at 11:26:58AM +0100, Petr Štetiar wrote:
> Daniel Golle <daniel at makrotopia.org> [2018-12-29 06:51:32]:
> 
> >  config KERNEL_AIO
> >  config KERNEL_FHANDLE
> >  config KERNEL_FANOTIFY
> > +	default y if !SMALL_FLASH
> 
> What about `FEATURES += nas` to make it clear and don't abuse SMALL_FLASH.

This is not necessarily only used on NAS devices. systemd requires
FHANDLE and FANOTIFY (eg. when running inside LXC container), lvm2
needs AIO. Both could well run on a modern router or SBC having USB or
an SDCARD slot.
> 
> >  config KERNEL_CGROUPS
> >  config KERNEL_CPUSETS
> >  config KERNEL_CGROUP_CPUACCT
> >  config KERNEL_RESOURCE_COUNTERS
> >  config KERNEL_MEMCG
> >  config KERNEL_MEMCG_KMEM
> >  menuconfig KERNEL_CGROUP_SCHED
> >   config KERNEL_FAIR_GROUP_SCHED
> >   config KERNEL_RT_GROUP_SCHED
> >  config KERNEL_NAMESPACES
> >  config KERNEL_LXC_MISC
> >  config KERNEL_SECCOMP_FILTER
> >  config KERNEL_SECCOMP
> > -		default n
> > +		default y if !SMALL_FLASH
> 
> What about `FEATURES += containers` ?

From what I understood FEATURES is supposed to reflect hardware
capabilities -- all the above are generic software features useful on
any device having the capacity (ie. flash and RAM) to make use of them.

> 
> Daniel Engberg <daniel.engberg.lists at pyret.net> [2018-12-30 10:21:46]:
> 
> > however KERNEL_CGROUPS, config KERNEL_NAMESPACES, config KERNEL_LXC_MISC,
> > KERNEL_SECCOMP_FILTER are very limited use cases to my knowledge and more or
> > less only used on x86*?
> 
> There are other quite powerful platforms like mvebu, imx6, ipq etc. where you
> could use this as well.

I use LXC on oxnas/ox820 (ARM11mpcore) and ramips/mt7621 (MIPS1004Kc),
running Debian inside LXC containers (and it's annoying that I can't
use regular OpenWrt releases or buildbot-generated snapshots on the).


Cheers


Daniel

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