[PATCH 0/1] posix timers: Expand exitsting info in proc file

[PATCH 0/1] posix timers: Expand exitsting info in proc file

[Pavel Tikhomirov]

Hi.

I'm working on the checkpoint-restore project (http://criu.org), on
realisation of posix-timers. To compleatly checkpoint and restore these
timers we need to know which clock they are using. So I d'like to add
this information to existing syscall which shows posix-timers info.

Pavel Tikhomirov (1):
  posix-timers: Show clock ID in proc file

 fs/proc/base.c |    1 +
 1 file changed, 1 insertion(+)

-- 
1.7.9.5

[PATCH 1/1] posix-timers: Show clock ID in proc file

[Pavel Tikhomirov]

Expand information about posix-timers in /proc/<pid>/timers by adding
info about clock, with which the timer was created. I.e. in the forth
line of timer info after "notify:" line go "ClockID: <clock_id>".

Signed-off-by: Pavel Tikhomirov <snorcht-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 fs/proc/base.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 2dad4a9..8a38eef 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2079,6 +2079,7 @@ static int show_timer(struct seq_file *m, void *v)
 		nstr[notify & ~SIGEV_THREAD_ID],
 		(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
 		pid_nr_ns(timer->it_pid, tp->ns));
+	seq_printf(m, "ClockID: %d\n", timer->it_clock);
 
 	return 0;
 }
-- 
1.7.9.5

Re: [PATCH 1/1] posix-timers: Show clock ID in proc file

[Greg KH]

On Fri, May 17, 2013 at 02:12:03AM +0400, Pavel Tikhomirov wrote:
> Expand information about posix-timers in /proc/<pid>/timers by adding
> info about clock, with which the timer was created. I.e. in the forth
> line of timer info after "notify:" line go "ClockID: <clock_id>".
> 
> Signed-off-by: Pavel Tikhomirov <snorcht-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  fs/proc/base.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 2dad4a9..8a38eef 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2079,6 +2079,7 @@ static int show_timer(struct seq_file *m, void *v)
>  		nstr[notify & ~SIGEV_THREAD_ID],
>  		(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
>  		pid_nr_ns(timer->it_pid, tp->ns));
> +	seq_printf(m, "ClockID: %d\n", timer->it_clock);

What userspace tool just broke by adding a new field to this file?

thanks,

greg k-h

Re: [PATCH 1/1] posix-timers: Show clock ID in proc file

[Pavel Emelyanov]

On 05/17/2013 07:59 PM, Greg KH wrote:
> On Fri, May 17, 2013 at 02:12:03AM +0400, Pavel Tikhomirov wrote:
>> Expand information about posix-timers in /proc/<pid>/timers by adding
>> info about clock, with which the timer was created. I.e. in the forth
>> line of timer info after "notify:" line go "ClockID: <clock_id>".
>>
>> Signed-off-by: Pavel Tikhomirov <snorcht@gmail.com>
>> ---
>>  fs/proc/base.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/proc/base.c b/fs/proc/base.c
>> index 2dad4a9..8a38eef 100644
>> --- a/fs/proc/base.c
>> +++ b/fs/proc/base.c
>> @@ -2079,6 +2079,7 @@ static int show_timer(struct seq_file *m, void *v)
>>  		nstr[notify & ~SIGEV_THREAD_ID],
>>  		(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
>>  		pid_nr_ns(timer->it_pid, tp->ns));
>> +	seq_printf(m, "ClockID: %d\n", timer->it_clock);
> 
> What userspace tool just broke by adding a new field to this file?

Zero for two reasons:

1. this proc file appeared this merge window
2. this file format is

  <name>: <value>

and should be parsed line-by-line by applications like e.g. /proc/pid/status
or /proc/pid/smaps. Both these files were extended with fields in the past with
no worries to tools, so should be this new one.

> thanks,
> 
> greg k-h
> .
> 


Thanks,
Pavel

Re: [PATCH 1/1] posix-timers: Show clock ID in proc file

[Greg KH]

On Fri, May 17, 2013 at 08:12:55PM +0400, Pavel Emelyanov wrote:
> On 05/17/2013 07:59 PM, Greg KH wrote:
> > On Fri, May 17, 2013 at 02:12:03AM +0400, Pavel Tikhomirov wrote:
> >> Expand information about posix-timers in /proc/<pid>/timers by adding
> >> info about clock, with which the timer was created. I.e. in the forth
> >> line of timer info after "notify:" line go "ClockID: <clock_id>".
> >>
> >> Signed-off-by: Pavel Tikhomirov <snorcht-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> >> ---
> >>  fs/proc/base.c |    1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/fs/proc/base.c b/fs/proc/base.c
> >> index 2dad4a9..8a38eef 100644
> >> --- a/fs/proc/base.c
> >> +++ b/fs/proc/base.c
> >> @@ -2079,6 +2079,7 @@ static int show_timer(struct seq_file *m, void *v)
> >>  		nstr[notify & ~SIGEV_THREAD_ID],
> >>  		(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
> >>  		pid_nr_ns(timer->it_pid, tp->ns));
> >> +	seq_printf(m, "ClockID: %d\n", timer->it_clock);
> > 
> > What userspace tool just broke by adding a new field to this file?
> 
> Zero for two reasons:
> 
> 1. this proc file appeared this merge window
> 2. this file format is
> 
>   <name>: <value>
> 
> and should be parsed line-by-line by applications like e.g. /proc/pid/status
> or /proc/pid/smaps. Both these files were extended with fields in the past with
> no worries to tools, so should be this new one.

Ok, just making sure :)

Re: [PATCH 1/1] posix-timers: Show clock ID in proc file

[Pavel Emelyanov]

On 05/17/2013 02:12 AM, Pavel Tikhomirov wrote:
> Expand information about posix-timers in /proc/<pid>/timers by adding
> info about clock, with which the timer was created. I.e. in the forth
> line of timer info after "notify:" line go "ClockID: <clock_id>".
> 
> Signed-off-by: Pavel Tikhomirov <snorcht-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>


Acked-by: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>

> ---
>  fs/proc/base.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 2dad4a9..8a38eef 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -2079,6 +2079,7 @@ static int show_timer(struct seq_file *m, void *v)
>  		nstr[notify & ~SIGEV_THREAD_ID],
>  		(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
>  		pid_nr_ns(timer->it_pid, tp->ns));
> +	seq_printf(m, "ClockID: %d\n", timer->it_clock);
>  
>  	return 0;
>  }
>