From: Andrew Vagin <avagin@virtuozzo.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Andrey Vagin <avagin@openvz.org>, David Ahern <dsahern@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux API <linux-api@vger.kernel.org>,
"Oleg Nesterov" <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Cyrill Gorcunov" <gorcunov@openvz.org>,
Pavel Emelyanov <xemul@parallels.com>,
"Roger Luethi" <rl@hellgate.ch>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
"Pavel Odintsov" <pavel.odintsov@gmail.com>
Subject: Re: [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2)
Date: Mon, 14 Dec 2015 11:05:39 +0300 [thread overview]
Message-ID: <20151214080538.GC4112@odin.com> (raw)
In-Reply-To: <1583220.Fp5vNj67Du@wuerfel>
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
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Vagin <avagin-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org>
To: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
Cc: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Andrey Vagin <avagin-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
David Ahern <dsahern-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Cyrill Gorcunov
<gorcunov-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
Roger Luethi <rl-7uj+XXdSDtwfv37vnLkPlQ@public.gmane.org>,
Arnaldo Carvalho de Melo
<acme-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Pavel Odintsov
<pavel.odintsov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2)
Date: Mon, 14 Dec 2015 11:05:39 +0300 [thread overview]
Message-ID: <20151214080538.GC4112@odin.com> (raw)
In-Reply-To: <1583220.Fp5vNj67Du@wuerfel>
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
next prev parent reply other threads:[~2015-12-14 8:05 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-06 8:47 [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2) Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 01/24] kernel: define taststats commands in the one place Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 02/24] kernel: add a netlink interface to get information about tasks (v2) Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 03/24] kernel: make taskstats available from all net namespaces Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 04/24] kernel: move next_tgid from fs/proc Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 05/24] task_diag: add ability to get information about all tasks Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 06/24] task_diag: add ability to split per-task data on a few netlink messages Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 07/24] task_diag: add a new group to get process credentials Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 08/24] proc: pick out a function to iterate task children Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-14 18:02 ` Oleg Nesterov
2015-07-14 18:02 ` Oleg Nesterov
2015-07-17 15:57 ` Andrew Vagin
2015-07-17 15:57 ` Andrew Vagin
2015-07-18 21:22 ` Oleg Nesterov
2015-07-18 21:22 ` Oleg Nesterov
2015-07-06 8:47 ` [PATCH 09/24] proc: move task_next_child() from fs/proc Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 10/24] task_diag: add ability to dump children (v2) Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 11/24] task_diag: add a new group to get task statistics Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 12/24] task_diag: add a new group to get tasks memory mappings (v2) Andrey Vagin
2015-07-14 18:08 ` Oleg Nesterov
2015-07-14 18:08 ` Oleg Nesterov
2015-07-15 2:02 ` David Ahern
2015-07-15 2:02 ` David Ahern
2015-07-06 8:47 ` [PATCH 13/24] task_diag: shows memory consumption for " Andrey Vagin
2015-07-06 8:47 ` [PATCH 14/24] task_diag: add a marcos to enumirate memory mappings Andrey Vagin
2015-07-06 8:47 ` [PATCH 15/24] proc: give task_struct instead of pid into first_tid Andrey Vagin
2015-07-14 18:11 ` Oleg Nesterov
2015-07-06 8:47 ` [PATCH 16/24] proc: move first_tid and next_tid out of proc Andrey Vagin
2015-07-06 8:47 ` [PATCH 17/24] task_diag: add ability to dump theads Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 8:47 ` [PATCH 18/24] task_diag: add ability to handle one task in a continious mode Andrey Vagin
2015-07-06 8:47 ` [PATCH 19/24] task_diag: Add option to dump all threads for all tasks Andrey Vagin
2015-07-06 8:47 ` [PATCH 20/24] task_diag: Only add VMAs for thread_group leader Andrey Vagin
2015-07-14 17:47 ` Oleg Nesterov
2015-07-14 17:47 ` Oleg Nesterov
2015-07-15 2:01 ` David Ahern
2015-07-15 13:31 ` Oleg Nesterov
2015-07-15 13:31 ` Oleg Nesterov
2015-07-06 8:47 ` [PATCH 21/24] task diag: Add support for TGID attribute Andrey Vagin
2015-07-06 8:47 ` [PATCH 22/24] Documentation: add documentation for task_diag Andrey Vagin
2015-07-06 8:47 ` [PATCH 23/24] selftest: check the task_diag functinonality Andrey Vagin
2015-07-06 8:47 ` [PATCH 24/24] task_diag: Enhance fork tool to spawn threads Andrey Vagin
2015-07-06 8:47 ` Andrey Vagin
2015-07-06 17:10 ` [PATCH 0/24] kernel: add a netlink interface to get information about processes (v2) Andy Lutomirski
2015-07-07 15:43 ` Andrew Vagin
2015-07-07 15:56 ` Andy Lutomirski
2015-07-07 15:56 ` Andy Lutomirski
2015-07-07 16:17 ` David Ahern
2015-07-07 16:17 ` David Ahern
2015-07-07 16:24 ` Andy Lutomirski
2015-07-07 16:41 ` David Ahern
2015-07-07 16:41 ` David Ahern
2015-07-08 16:10 ` Andrew Vagin
2015-07-08 16:10 ` Andrew Vagin
2015-07-08 17:39 ` Andy Lutomirski
2015-07-08 22:49 ` Andrey Vagin
2015-07-08 23:48 ` Andy Lutomirski
2015-07-08 23:48 ` Andy Lutomirski
2015-07-07 16:25 ` Arnaldo Carvalho de Melo
2015-07-07 16:25 ` Arnaldo Carvalho de Melo
2015-07-07 16:27 ` Andy Lutomirski
2015-07-07 16:27 ` Andy Lutomirski
2015-07-07 16:56 ` David Ahern
2015-07-07 16:56 ` David Ahern
2015-11-24 15:18 ` Andrew Vagin
2015-11-24 15:18 ` Andrew Vagin
2015-12-03 23:20 ` Andy Lutomirski
2015-12-03 23:20 ` Andy Lutomirski
2015-12-03 23:43 ` Arnd Bergmann
2015-12-14 8:05 ` Andrew Vagin [this message]
2015-12-14 8:05 ` Andrew Vagin
2015-12-14 7:52 ` Andrew Vagin
2015-12-14 7:52 ` Andrew Vagin
2015-12-14 22:38 ` Andy Lutomirski
2015-12-15 15:53 ` Andrew Vagin
2015-12-15 15:53 ` Andrew Vagin
2015-12-15 16:43 ` Andy Lutomirski
2015-12-15 16:43 ` Andy Lutomirski
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