On Tue, Apr 30, 2019 at 01:53:33PM +0200, Oleg Nesterov wrote:
> On 04/29, Joel Fernandes wrote:
> >
> > On Mon, Apr 29, 2019 at 04:20:30PM +0200, Oleg Nesterov wrote:
> > > On 04/29, Joel Fernandes wrote:
> > > >
> > > > However, in your code above, it is avoided because we get:
> > > >
> > > >
On 04/30, Oleg Nesterov wrote:
>
> > > pidfd_poll() can race with the exiting task, miss exit_code != 0, and
> > > return
> > > zero. However, do_poll() won't block after that and pidfd_poll() will be
> > > called
> > > again.
> >
> > Here also I didn't follow what you mean. If exit_code is read
On 04/29, Joel Fernandes wrote:
>
> On Mon, Apr 29, 2019 at 04:20:30PM +0200, Oleg Nesterov wrote:
> > On 04/29, Joel Fernandes wrote:
> > >
> > > However, in your code above, it is avoided because we get:
> > >
> > > Task A (poller) Task B (exiting task being polled)
> > >
On Mon, Apr 29, 2019 at 04:20:30PM +0200, Oleg Nesterov wrote:
> On 04/29, Joel Fernandes wrote:
> >
> > However, in your code above, it is avoided because we get:
> >
> > Task A (poller) Task B (exiting task being polled)
> >
> > poll() called
On 04/29, Joel Fernandes wrote:
>
> On Mon, Apr 29, 2019 at 10:02:45AM -0400, Joel Fernandes wrote:
> > On Sun, Apr 28, 2019 at 06:24:06PM +0200, Oleg Nesterov wrote:
> [snip]
> > > > > +{
> > > > > + struct pid *pid;
> > > > > +
> > > > > + lockdep_assert_held(_lock);
> > > > > +
> > > >
On 04/29, Joel Fernandes wrote:
>
> However, in your code above, it is avoided because we get:
>
> Task A (poller) Task B (exiting task being polled)
>
> poll() called
> add_wait_queue()
> exit_state is set to non-zero
>
On Mon, Apr 29, 2019 at 10:02:45AM -0400, Joel Fernandes wrote:
> On Sun, Apr 28, 2019 at 06:24:06PM +0200, Oleg Nesterov wrote:
[snip]
> > > > +{
> > > > + struct pid *pid;
> > > > +
> > > > + lockdep_assert_held(_lock);
> > > > +
> > > > + pid = get_task_pid(task, PIDTYPE_PID);
On Sun, Apr 28, 2019 at 06:24:06PM +0200, Oleg Nesterov wrote:
> Thanks for cc'ing me...
>
> On 04/26, Christian Brauner wrote:
> >
> > On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> > > +static unsigned int pidfd_poll(struct file *file, struct
> > > poll_table_struct
Thanks for cc'ing me...
On 04/26, Christian Brauner wrote:
>
> On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> > +static unsigned int pidfd_poll(struct file *file, struct poll_table_struct
> > *pts)
> > +{
> > + struct task_struct *task;
> > + struct pid *pid;
> >
On April 26, 2019 5:21:40 PM GMT+02:00, Christian Brauner
wrote:
>On Fri, Apr 26, 2019 at 10:23:37AM -0400, Joel Fernandes wrote:
>> On Fri, Apr 26, 2019 at 12:24:04AM +0200, Christian Brauner wrote:
>> > On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google)
>wrote:
>> > > pidfd are
On Fri, Apr 26, 2019 at 10:23:37AM -0400, Joel Fernandes wrote:
> On Fri, Apr 26, 2019 at 12:24:04AM +0200, Christian Brauner wrote:
> > On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> > > pidfd are file descriptors referring to a process created with the
> > >
On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> pidfd are file descriptors referring to a process created with the
> CLONE_PIDFD clone(2) flag. Android low memory killer (LMK) needs pidfd
> polling support to replace code that currently checks for existence of
>
On Fri, Apr 26, 2019 at 12:24:04AM +0200, Christian Brauner wrote:
> On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> > pidfd are file descriptors referring to a process created with the
> > CLONE_PIDFD clone(2) flag. Android low memory killer (LMK) needs pidfd
> >
On Thu, Apr 25, 2019 at 03:00:09PM -0400, Joel Fernandes (Google) wrote:
> pidfd are file descriptors referring to a process created with the
> CLONE_PIDFD clone(2) flag. Android low memory killer (LMK) needs pidfd
> polling support to replace code that currently checks for existence of
>
pidfd are file descriptors referring to a process created with the
CLONE_PIDFD clone(2) flag. Android low memory killer (LMK) needs pidfd
polling support to replace code that currently checks for existence of
/proc/pid for knowing that a process that is signalled to be killed has
died, which is
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