From: Joel Fernandes <joel@joelfernandes.org>
To: Christian Brauner <christian@brauner.io>
Cc: linux-kernel@vger.kernel.org, luto@amacapital.net,
rostedt@goodmis.org, dancol@google.com, jannh@google.com,
surenb@google.com, torvalds@linux-foundation.org,
Alexey Dobriyan <adobriyan@gmail.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Andrei Vagin <avagin@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Arnd Bergmann <arnd@arndb.de>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Kees Cook <keescook@chromium.org>,
linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org,
Michal Hocko <mhocko@suse.com>, Nadav Amit <namit@vmware.com>,
Oleg Nesterov <oleg@redhat.com>, Serge Hallyn <serge@hallyn.com>,
Shuah Khan <shuah@kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Taehee Yoo <ap420073@gmail.com>, Tejun Heo <tj@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
kernel-team@android.com, Tycho Andersen <tycho@tycho.ws>
Subject: Re: [PATCH RFC 1/2] Add polling support to pidfd
Date: Thu, 11 Apr 2019 16:20:06 -0400 [thread overview]
Message-ID: <20190411202006.GA130334@google.com> (raw)
In-Reply-To: <DA36DE02-73C2-4C9E-9761-27B3EBC6FED2@brauner.io>
On Thu, Apr 11, 2019 at 10:02:32PM +0200, Christian Brauner wrote:
> On April 11, 2019 10:00:59 PM GMT+02:00, Joel Fernandes <joel@joelfernandes.org> wrote:
> >On Thu, Apr 11, 2019 at 01:50:42PM -0400, Joel Fernandes (Google)
> >wrote:
> >> pidfd are /proc/pid directory file descriptors referring to a task
> >group
> >> leader. Android low memory killer (LMK) needs pidfd polling support
> >to
> >> replace code that currently checks for existence of /proc/pid for
> >> knowing a process that is signalled to be killed has died, which is
> >both
> >> racy and slow. The pidfd poll approach is race-free, and also allows
> >the
> >> LMK to do other things (such as by polling on other fds) while
> >awaiting
> >> the process being killed to die.
> >
> >It appears to me that the "pidfd" now will be an anon inode fd, and not
> >based
> >on /proc/, based on discussions with Linus. So I'll rework the patches
> >accordingly. However that is relatively independent of this patch so
> >this
> >version can also be reviewed before I send out the reworked version.
>
> Thank you very much, Joel.
> I'm off this week and traveling but I'll try to give it a look asap.
>
> Christian
Sounds great to me, thanks a lot Christian.
- Joel
WARNING: multiple messages have this Message-ID (diff)
From: joel at joelfernandes.org (Joel Fernandes)
Subject: [PATCH RFC 1/2] Add polling support to pidfd
Date: Thu, 11 Apr 2019 16:20:06 -0400 [thread overview]
Message-ID: <20190411202006.GA130334@google.com> (raw)
In-Reply-To: <DA36DE02-73C2-4C9E-9761-27B3EBC6FED2@brauner.io>
On Thu, Apr 11, 2019 at 10:02:32PM +0200, Christian Brauner wrote:
> On April 11, 2019 10:00:59 PM GMT+02:00, Joel Fernandes <joel at joelfernandes.org> wrote:
> >On Thu, Apr 11, 2019 at 01:50:42PM -0400, Joel Fernandes (Google)
> >wrote:
> >> pidfd are /proc/pid directory file descriptors referring to a task
> >group
> >> leader. Android low memory killer (LMK) needs pidfd polling support
> >to
> >> replace code that currently checks for existence of /proc/pid for
> >> knowing a process that is signalled to be killed has died, which is
> >both
> >> racy and slow. The pidfd poll approach is race-free, and also allows
> >the
> >> LMK to do other things (such as by polling on other fds) while
> >awaiting
> >> the process being killed to die.
> >
> >It appears to me that the "pidfd" now will be an anon inode fd, and not
> >based
> >on /proc/, based on discussions with Linus. So I'll rework the patches
> >accordingly. However that is relatively independent of this patch so
> >this
> >version can also be reviewed before I send out the reworked version.
>
> Thank you very much, Joel.
> I'm off this week and traveling but I'll try to give it a look asap.
>
> Christian
Sounds great to me, thanks a lot Christian.
- Joel
WARNING: multiple messages have this Message-ID (diff)
From: joel@joelfernandes.org (Joel Fernandes)
Subject: [PATCH RFC 1/2] Add polling support to pidfd
Date: Thu, 11 Apr 2019 16:20:06 -0400 [thread overview]
Message-ID: <20190411202006.GA130334@google.com> (raw)
Message-ID: <20190411202006.goLtrWFPD92-0T95IKCu7BuQ3S8KVOWCs9pRj5pMoTo@z> (raw)
In-Reply-To: <DA36DE02-73C2-4C9E-9761-27B3EBC6FED2@brauner.io>
On Thu, Apr 11, 2019@10:02:32PM +0200, Christian Brauner wrote:
> On April 11, 2019 10:00:59 PM GMT+02:00, Joel Fernandes <joel@joelfernandes.org> wrote:
> >On Thu, Apr 11, 2019 at 01:50:42PM -0400, Joel Fernandes (Google)
> >wrote:
> >> pidfd are /proc/pid directory file descriptors referring to a task
> >group
> >> leader. Android low memory killer (LMK) needs pidfd polling support
> >to
> >> replace code that currently checks for existence of /proc/pid for
> >> knowing a process that is signalled to be killed has died, which is
> >both
> >> racy and slow. The pidfd poll approach is race-free, and also allows
> >the
> >> LMK to do other things (such as by polling on other fds) while
> >awaiting
> >> the process being killed to die.
> >
> >It appears to me that the "pidfd" now will be an anon inode fd, and not
> >based
> >on /proc/, based on discussions with Linus. So I'll rework the patches
> >accordingly. However that is relatively independent of this patch so
> >this
> >version can also be reviewed before I send out the reworked version.
>
> Thank you very much, Joel.
> I'm off this week and traveling but I'll try to give it a look asap.
>
> Christian
Sounds great to me, thanks a lot Christian.
- Joel
next prev parent reply other threads:[~2019-04-11 20:20 UTC|newest]
Thread overview: 198+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-11 17:50 [PATCH RFC 1/2] Add polling support to pidfd Joel Fernandes (Google)
2019-04-11 17:50 ` Joel Fernandes (Google)
2019-04-11 17:50 ` joel
2019-04-11 17:50 ` [PATCH RFC 2/2] Add selftests for pidfd polling Joel Fernandes (Google)
2019-04-11 17:50 ` Joel Fernandes (Google)
2019-04-11 17:50 ` joel
2019-04-12 14:51 ` Tycho Andersen
2019-04-12 14:51 ` Tycho Andersen
2019-04-12 14:51 ` tycho
2019-04-11 20:00 ` [PATCH RFC 1/2] Add polling support to pidfd Joel Fernandes
2019-04-11 20:00 ` Joel Fernandes
2019-04-11 20:00 ` joel
2019-04-11 20:02 ` Christian Brauner
2019-04-11 20:02 ` Christian Brauner
2019-04-11 20:02 ` christian
2019-04-11 20:20 ` Joel Fernandes [this message]
2019-04-11 20:20 ` Joel Fernandes
2019-04-11 20:20 ` joel
2019-04-12 21:32 ` Andy Lutomirski
2019-04-12 21:32 ` Andy Lutomirski
2019-04-12 21:32 ` luto
2019-04-13 0:09 ` Joel Fernandes
2019-04-13 0:09 ` Joel Fernandes
2019-04-13 0:09 ` joel
[not found] ` <CAKOZuetX4jMPDtDqAvGgSNo4BHf9BOnu79ufEiULfM5X5nDyyQ@mail.gmail.com>
2019-04-13 0:56 ` Daniel Colascione
2019-04-13 0:56 ` Daniel Colascione
2019-04-13 0:56 ` dancol
2019-04-14 18:19 ` Linus Torvalds
2019-04-14 18:19 ` Linus Torvalds
2019-04-14 18:19 ` torvalds
2019-04-16 12:04 ` Oleg Nesterov
2019-04-16 12:04 ` Oleg Nesterov
2019-04-16 12:04 ` oleg
2019-04-16 12:43 ` Oleg Nesterov
2019-04-16 12:43 ` Oleg Nesterov
2019-04-16 12:43 ` oleg
2019-04-16 19:20 ` Joel Fernandes
2019-04-16 19:20 ` Joel Fernandes
2019-04-16 19:20 ` joel
2019-04-16 19:32 ` Joel Fernandes
2019-04-16 19:32 ` Joel Fernandes
2019-04-16 19:32 ` joel
2019-04-17 13:09 ` Oleg Nesterov
2019-04-17 13:09 ` Oleg Nesterov
2019-04-17 13:09 ` oleg
2019-04-18 17:23 ` Jann Horn
2019-04-18 17:23 ` Jann Horn
2019-04-18 17:23 ` jannh
2019-04-18 17:26 ` Christian Brauner
2019-04-18 17:26 ` Christian Brauner
2019-04-18 17:26 ` christian
2019-04-18 17:53 ` Daniel Colascione
2019-04-18 17:53 ` Daniel Colascione
2019-04-18 17:53 ` dancol
2019-04-19 19:02 ` Joel Fernandes
2019-04-19 19:02 ` Joel Fernandes
2019-04-19 19:02 ` joel
2019-04-19 19:18 ` Christian Brauner
2019-04-19 19:18 ` Christian Brauner
2019-04-19 19:18 ` christian
2019-04-19 19:22 ` Christian Brauner
2019-04-19 19:22 ` Christian Brauner
2019-04-19 19:22 ` christian
2019-04-19 19:42 ` Christian Brauner
2019-04-19 19:42 ` Christian Brauner
2019-04-19 19:42 ` christian
2019-04-19 19:49 ` Joel Fernandes
2019-04-19 19:49 ` Joel Fernandes
2019-04-19 19:49 ` joel
2019-04-19 20:01 ` Christian Brauner
2019-04-19 20:01 ` Christian Brauner
2019-04-19 20:01 ` christian
2019-04-19 21:13 ` Joel Fernandes
2019-04-19 21:13 ` Joel Fernandes
2019-04-19 21:13 ` joel
2019-04-19 20:34 ` Daniel Colascione
2019-04-19 20:34 ` Daniel Colascione
2019-04-19 20:34 ` dancol
2019-04-19 20:57 ` Christian Brauner
2019-04-19 20:57 ` Christian Brauner
2019-04-19 20:57 ` christian
2019-04-19 21:20 ` Joel Fernandes
2019-04-19 21:20 ` Joel Fernandes
2019-04-19 21:20 ` joel
2019-04-19 21:24 ` Daniel Colascione
2019-04-19 21:24 ` Daniel Colascione
2019-04-19 21:24 ` dancol
2019-04-19 21:45 ` Joel Fernandes
2019-04-19 21:45 ` Joel Fernandes
2019-04-19 21:45 ` joel
2019-04-19 22:08 ` Daniel Colascione
2019-04-19 22:08 ` Daniel Colascione
2019-04-19 22:08 ` dancol
2019-04-19 22:17 ` Christian Brauner
2019-04-19 22:17 ` Christian Brauner
2019-04-19 22:17 ` christian
2019-04-19 22:37 ` Daniel Colascione
2019-04-19 22:37 ` Daniel Colascione
2019-04-19 22:37 ` dancol
2019-04-24 8:04 ` Enrico Weigelt, metux IT consult
2019-04-24 8:04 ` Enrico Weigelt, metux IT consult
2019-04-24 8:04 ` lkml
2019-04-19 21:59 ` Christian Brauner
2019-04-19 21:59 ` Christian Brauner
2019-04-19 21:59 ` christian
2019-04-20 11:51 ` Oleg Nesterov
2019-04-20 11:51 ` Oleg Nesterov
2019-04-20 11:51 ` oleg
2019-04-20 12:26 ` Oleg Nesterov
2019-04-20 12:26 ` Oleg Nesterov
2019-04-20 12:26 ` oleg
2019-04-20 12:35 ` Christian Brauner
2019-04-20 12:35 ` Christian Brauner
2019-04-20 12:35 ` christian
2019-04-19 23:11 ` Linus Torvalds
2019-04-19 23:11 ` Linus Torvalds
2019-04-19 23:11 ` torvalds
2019-04-19 23:20 ` Christian Brauner
2019-04-19 23:20 ` Christian Brauner
2019-04-19 23:20 ` christian
2019-04-19 23:32 ` Linus Torvalds
2019-04-19 23:32 ` Linus Torvalds
2019-04-19 23:32 ` torvalds
2019-04-19 23:36 ` Daniel Colascione
2019-04-19 23:36 ` Daniel Colascione
2019-04-19 23:36 ` dancol
2019-04-20 0:46 ` Joel Fernandes
2019-04-20 0:46 ` Joel Fernandes
2019-04-20 0:46 ` joel
2019-04-19 21:21 ` Daniel Colascione
2019-04-19 21:21 ` Daniel Colascione
2019-04-19 21:21 ` dancol
2019-04-19 21:48 ` Christian Brauner
2019-04-19 21:48 ` Christian Brauner
2019-04-19 21:48 ` christian
2019-04-19 22:02 ` Christian Brauner
2019-04-19 22:02 ` Christian Brauner
2019-04-19 22:02 ` christian
2019-04-19 22:46 ` Daniel Colascione
2019-04-19 22:46 ` Daniel Colascione
2019-04-19 22:46 ` dancol
2019-04-19 23:12 ` Christian Brauner
2019-04-19 23:12 ` Christian Brauner
2019-04-19 23:12 ` christian
2019-04-19 23:46 ` Daniel Colascione
2019-04-19 23:46 ` Daniel Colascione
2019-04-19 23:46 ` dancol
2019-04-20 0:17 ` Christian Brauner
2019-04-20 0:17 ` Christian Brauner
2019-04-20 0:17 ` christian
2019-04-24 9:05 ` Enrico Weigelt, metux IT consult
2019-04-24 9:05 ` Enrico Weigelt, metux IT consult
2019-04-24 9:05 ` lkml
2019-04-24 9:03 ` Enrico Weigelt, metux IT consult
2019-04-24 9:03 ` Enrico Weigelt, metux IT consult
2019-04-24 9:03 ` lkml
2019-04-19 22:35 ` Daniel Colascione
2019-04-19 22:35 ` Daniel Colascione
2019-04-19 22:35 ` dancol
2019-04-19 23:02 ` Christian Brauner
2019-04-19 23:02 ` Christian Brauner
2019-04-19 23:02 ` christian
2019-04-19 23:29 ` Daniel Colascione
2019-04-19 23:29 ` Daniel Colascione
2019-04-19 23:29 ` dancol
2019-04-20 0:02 ` Christian Brauner
2019-04-20 0:02 ` Christian Brauner
2019-04-20 0:02 ` christian
2019-04-24 9:17 ` Enrico Weigelt, metux IT consult
2019-04-24 9:17 ` Enrico Weigelt, metux IT consult
2019-04-24 9:17 ` lkml
2019-04-24 9:11 ` Enrico Weigelt, metux IT consult
2019-04-24 9:11 ` Enrico Weigelt, metux IT consult
2019-04-24 9:11 ` lkml
2019-04-24 8:56 ` Enrico Weigelt, metux IT consult
2019-04-24 8:56 ` Enrico Weigelt, metux IT consult
2019-04-24 8:56 ` lkml
2019-04-24 8:20 ` Enrico Weigelt, metux IT consult
2019-04-24 8:20 ` Enrico Weigelt, metux IT consult
2019-04-24 8:20 ` lkml
2019-04-19 15:43 ` Oleg Nesterov
2019-04-19 15:43 ` Oleg Nesterov
2019-04-19 15:43 ` oleg
2019-04-19 18:12 ` Joel Fernandes
2019-04-19 18:12 ` Joel Fernandes
2019-04-19 18:12 ` joel
2019-04-18 18:44 ` Jonathan Kowalski
2019-04-18 18:44 ` Jonathan Kowalski
2019-04-18 18:44 ` bl0pbl33p
2019-04-18 18:57 ` Daniel Colascione
2019-04-18 18:57 ` Daniel Colascione
2019-04-18 18:57 ` dancol
2019-04-18 19:14 ` Linus Torvalds
2019-04-18 19:14 ` Linus Torvalds
2019-04-18 19:14 ` torvalds
2019-04-19 19:05 ` Joel Fernandes
2019-04-19 19:05 ` Joel Fernandes
2019-04-19 19:05 ` joel
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