linux-kernel - Re: [PATCH] [RFC] pidns: don't zap processes several times

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Message-ID: <20121009162925.GA6517@redhat.com>
Date:	Tue, 9 Oct 2012 18:29:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrey Wagin <avagin@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH] [RFC] pidns: don't zap processes several times

On 10/08, Andrey Wagin wrote:
>
> 2012/10/7 Oleg Nesterov <oleg@...hat.com>:
> >
> > Perhaps we should MAX_PID_NS_LEVEL instead?
>
> Yes, we can.
>
> Could I just define MAX_PID_NS_LEVEL in a code:
> #define MAX_PID_NS_LEVEL ((PAGE_SIZE - offsetof(struct pid, numbers))
> / sizeof(struct upid))

Or even less. But looks reasonable.

> Or should it be added in a config?

Personally I think that "define" is fine, we can add config/sysctl
later if needed.


Hmm. This is off-topic, but...

	create_pid_namespace:

		unsigned int level = parent_pid_ns->level + 1;
		ns->pid_cachep = create_pid_cachep(level + 1);

is it correct? is seems that only one "+ 1" is needed?

Oleg.

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