linux-kernel - Re: [PATCHv4] procfs: show hierarchy of pid namespace

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Date:	Tue, 14 Oct 2014 19:42:29 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Chen, Hanxiao" <chenhanxiao@...fujitsu.com>
Cc:	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	David Howells <dhowells@...hat.com>,
	Richard Weinberger <richard.weinberger@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Vasiliy Kulikov <segooon@...il.com>,
	Mateusz Guzik <mguzik@...hat.com>
Subject: Re: [PATCHv4] procfs: show hierarchy of pid namespace

On 10/13, Chen, Hanxiao wrote:
>
> > At the same time, for_each_process() in the global namespace can be
> > faster if there are a lot of sub-threads.
> >
> > > Perhaps that's not a good way.
> >
> > OK, I won't insist.
> >
> > although it would be nice to know why do you think this is bad.
> >
> I worried about it may slower in global namespace.
> But it will provide a great convenient way when query pid hierarchy
> when not in init_pid_ns.

Yes, it is not clear what is actually better, so ...

> I'll post a new patch using find_ge_pid + get_pid

Only if you think this makes more sense. I do not have a strong opinion.

And we can change the implementation at any time. The real problem is
the API this patch adds. I leave this to you and other reviewers who
understand the problem space better ;) Just I think that the changelog
could say a bit more, to explain why do we need this patch. IOW, explain
the problem and how/why this patch helps.

Oleg.

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