netdev - Re: [net-next PATCH 05/15] net: sched: a dflt qdisc may be used with per cpu stats

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Date:   Wed, 24 Aug 2016 10:26:50 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     jhs@...atatu.com, davem@...emloft.net, brouer@...hat.com,
        xiyou.wangcong@...il.com, alexei.starovoitov@...il.com,
        john.r.fastabend@...el.com, netdev@...r.kernel.org
Subject: Re: [net-next PATCH 05/15] net: sched: a dflt qdisc may be used
 with per cpu stats

On Wed, 2016-08-24 at 10:13 -0700, John Fastabend wrote:

> > 
> 
> I could fully allocate it in qdisc_alloc() but we don't know if the
> qdisc needs per cpu data structures until after the init call

Should not we have a flag to advertise the need of per spu stats on
qdisc ?

This is not clear why ->init() can know this, and not its caller.

> . So it
> would sit unused in those cases if done from qdisc_alloc(). It seems
> best to me at least to just avoid the allocation in qdisc_alloc() and
> do it after init like I did here.
> 
> Perhaps it would be nice to pull these into a function call
> post_init_qdisc_alloc() that does all this allocation?
> 
> .John
>