linux-kernel - Re: [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2)

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Date:	Mon, 14 Dec 2015 11:05:39 +0300
From:	Andrew Vagin <avagin@...tuozzo.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Andy Lutomirski <luto@...capital.net>,
	Andrey Vagin <avagin@...nvz.org>,
	David Ahern <dsahern@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	"Oleg Nesterov" <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Cyrill Gorcunov" <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Roger Luethi" <rl@...lgate.ch>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"Pavel Odintsov" <pavel.odintsov@...il.com>
Subject: Re: [PATCH 0/24] kernel: add a netlink interface to get information
 about processes (v2)

On Fri, Dec 04, 2015 at 12:43:29AM +0100, Arnd Bergmann wrote:
> On Thursday 03 December 2015 15:20:30 Andy Lutomirski wrote:
> > > * Netlink is designed for such type of workloads. It allows to expand
> > >   the interface and save backward compatibility. It allows to generates
> > >   packets with a different set of parameters.
> > > * If we use a file descriptor, we can create it and decrease
> > >   capabilities of the current process. It's a good feature which will be
> > >   unavailable if we decide to create a system call.
> > 
> > If this is actually a real goal and it matters, then I'd suggest doing
> > it right.  Make a way to create an fd that represents a pidns and,
> > specifically, the right to query non-secret properties of the
> > processes in the pidns.
> 
> My first thought about doing an interface here was to create a virtual
> file system that can be queried rather than using netlink, but then I
> realized that the idea was to avoid procfs ;-)

No, we doesn't have an idea to avoid using of procfs. The idea is to
create a new interace to get information about tasks, which will work
faster and will be more convenient for using from applications.

> 
> More seriously, maybe the answer is to have a transaction file in
> procfs itself. Procfs already knows about namespaces, so adding
> a /proc/task-diag file as the entry point into the kernel could
> get that out of the way.
> 
> The simple_transaction infrastructure that we have is limited to
> a little under a page for the total data size, but something similar
> could be used.

Thank you for the idea.
> 
> 	Arnd
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