Re: [PATCH v8 3/4] cgroups: allow a cgroup subsystem to reject a fork

From: Tejun Heo
Date: Mon Apr 06 2015 - 11:05:44 EST

Hello, Aleksa.

On Fri, Apr 03, 2015 at 10:42:27AM +1100, Aleksa Sarai wrote:
> I tried doing this and the kernel would refuse to boot. I believe it has
> something to do with the ordering of early_init subsystems, but I'm not

Hmmm... yeah, failure in early_init can be tricky to debug.

> entirely sure (this optimisation can be dealt with later [it's non-critical],
> so IMO this should be done in a separate patchset [if at all]). Also, your
> later comments would fix the subsys bitmask problem (we can just pass the
> default %NULL), we don't even need to test the index.

But we'd be adding quite a few loops in relatively hot paths. I don't
think it's a good idea to send the patches as-are because we can't
debug and fix them properly, right? If there are hard ordering
dependencies, the range of subsystems which require fork/exit doesn't
have to be at the beginning.


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