Patches for piping to core pattern ?

Patches for piping to core pattern ?

[Ravinandan Arakali (rarakali)]

Hi,
I am trying to port the "piping cores to an executable" to
our kernel (2.6.10 based). I took Andi Kleen's patch (3/3)
available at http://lwn.net/Articles/195310/ and some of
the supporting functions from 2.6.19. But it's not working
for me.

Andi's patch mentions "Using the infrastructure created in 
previous patches implement support to pipe core dumps into 
programs."

Can somebody point me to these previous patches ?

Thanks,
Ravi

Re: Patches for piping to core pattern ?

[Randy Dunlap]

On Sun, 4 May 2008 19:24:59 -0700 Ravinandan Arakali (rarakali) wrote:

> Hi,
> I am trying to port the "piping cores to an executable" to
> our kernel (2.6.10 based). I took Andi Kleen's patch (3/3)
> available at http://lwn.net/Articles/195310/ and some of
> the supporting functions from 2.6.19. But it's not working
> for me.
> 
> Andi's patch mentions "Using the infrastructure created in 
> previous patches implement support to pipe core dumps into 
> programs."
> 
> Can somebody point me to these previous patches ?

I don't know if these patches 1/3 and 2/3 represent the complete
infrastructure that Andi referred to, but you can find them here:

http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2339.html
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2340.html


---
~Randy

RE: Patches for piping to core pattern ?

[Ravinandan Arakali (rarakali)]

Randy,
Thanks for the pointers to the patches. 
I am now able to see the core getting streamed to
a program (such as gzip). 

But I see that the core itself is quite small (truncated). 
I see this behavior even when using the normal core_pattern 
(without the "|" ). Wonder if it has something to do with the
changes to binfmt_elf.c ? I'm not sure why these
changes are required for pipe support.

Thanks,
Ravi
 

-----Original Message-----
From: Randy Dunlap [mailto:randy.dunlap@oracle.com] 
Sent: Monday, May 05, 2008 8:56 AM
To: Ravinandan Arakali (rarakali)
Cc: Linux Kernel
Subject: Re: Patches for piping to core pattern ?

On Sun, 4 May 2008 19:24:59 -0700 Ravinandan Arakali (rarakali) wrote:

> Hi,
> I am trying to port the "piping cores to an executable" to our kernel 
> (2.6.10 based). I took Andi Kleen's patch (3/3) available at 
> http://lwn.net/Articles/195310/ and some of the supporting functions 
> from 2.6.19. But it's not working for me.
> 
> Andi's patch mentions "Using the infrastructure created in previous 
> patches implement support to pipe core dumps into programs."
> 
> Can somebody point me to these previous patches ?

I don't know if these patches 1/3 and 2/3 represent the complete
infrastructure that Andi referred to, but you can find them here:

http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2339.html
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2340.html


---
~Randy

RE: Patches for piping to core pattern ?

[Ravinandan Arakali (rarakali)]

Upon adding some debugs, I find that it dumps core file upto
4096 bytes and after that, when pipe_write() notices that the 
free memory is less than the requested size, it checks for 
pending signals and exits from pipe_write().

But note that the user-level application on the read end of
the pipe does get to process the 4096 bytes since I get
a compressed core file. Problem is that the writer bails out
after 4K.

Any ideas ?

Thanks,
Ravi

 

-----Original Message-----
From: Ravinandan Arakali (rarakali) 
Sent: Monday, May 05, 2008 6:55 PM
To: 'Randy Dunlap'
Cc: Linux Kernel
Subject: RE: Patches for piping to core pattern ?

Randy,
Thanks for the pointers to the patches. 
I am now able to see the core getting streamed to a program (such as
gzip). 

But I see that the core itself is quite small (truncated). 
I see this behavior even when using the normal core_pattern (without the
"|" ). Wonder if it has something to do with the changes to binfmt_elf.c
? I'm not sure why these changes are required for pipe support.

Thanks,
Ravi
 

-----Original Message-----
From: Randy Dunlap [mailto:randy.dunlap@oracle.com]
Sent: Monday, May 05, 2008 8:56 AM
To: Ravinandan Arakali (rarakali)
Cc: Linux Kernel
Subject: Re: Patches for piping to core pattern ?

On Sun, 4 May 2008 19:24:59 -0700 Ravinandan Arakali (rarakali) wrote:

> Hi,
> I am trying to port the "piping cores to an executable" to our kernel 
> (2.6.10 based). I took Andi Kleen's patch (3/3) available at 
> http://lwn.net/Articles/195310/ and some of the supporting functions 
> from 2.6.19. But it's not working for me.
> 
> Andi's patch mentions "Using the infrastructure created in previous 
> patches implement support to pipe core dumps into programs."
> 
> Can somebody point me to these previous patches ?

I don't know if these patches 1/3 and 2/3 represent the complete
infrastructure that Andi referred to, but you can find them here:

http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2339.html
http://www.uwsg.indiana.edu/hypermail/linux/kernel/0608.1/2340.html


---
~Randy