Re: struct ifnet and ifaddr handling [was: Re: Making global variables of if.c MPSAFE]

[Masao Uebayashi <uebayasi%gmail.com@localhost>]

On Wed, Nov 26, 2014 at 5:53 PM, Ryota Ozaki <ozaki-r%netbsd.org@localhost> wrote:
> On Wed, Nov 26, 2014 at 5:09 PM, Masao Uebayashi <uebayasi%gmail.com@localhost> wrote:
>> I overlooked you've back out the struct callout * dynamic allocation
>> part.  Can you make it use kmem as I showed?
>
> Hmm, I'll do so, although I don't yet understand why the pointer version
> is better than the embedded version.

You told that the pseudo interfaces have no watchdog/slowtimo.
Routers might have thousands of pseudo interfaces.  I'd save 10
pointers there.  struct ifnet is already too big.

But it's also true that callout_t is designed to be opaque to be
embedded in other structs.