netdev - Re: [PATCH net-next v3 1/3] xdp: Refactor devmap code in preparation for subsequent additions

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Date:   Mon, 04 Mar 2019 18:37:02 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next v3 1/3] xdp: Refactor devmap code in preparation for subsequent additions

Jakub Kicinski <jakub.kicinski@...ronome.com> writes:

> On Mon, 04 Mar 2019 13:47:47 +0100, Toke Høiland-Jørgensen wrote:
>> In an earlier version I had a namespace enter/exit notifier in devmap.c
>> as well, to react to new namespaces. And that notifier has a comment
>> about avoiding calls to synchronize_rcu(). But since this version
>> doesn't actually need that, maybe I can just keep using direct calls and
>> synchronize_rcu() and avoid the callback? I'm a bit worried about adding
>> both synchronize_rcu() and cond_resched() as a possible side effect of
>> every call to bpf_prog_put(), though; so maybe it's better to move the
>> cleanup somewhere it's actually safe to call cond_resched(); what would
>> that be, a workqueue?
>
> Workqueue would be my go to.

Gotcha! Thanks :)

-Toke