On Thu, May 21, 2015 at 11:47 PM, Andy Lutomirski <[email protected]> wrote: > On Thu, May 21, 2015 at 3:30 AM, Alban Crequy <[email protected]> wrote: >> From: Alban Crequy <[email protected]> >> >> commit 818411616baf ("fs, proc: introduce >> /proc/<pid>/task/<tid>/children entry") introduced the children entry >> for checkpoint restore and the file is only available on kernels >> configured with CONFIG_EXPERT and CONFIG_CHECKPOINT_RESTORE. >> >> This is available in most distributions (Fedora, Debian, Ubuntu, CoreOS) >> because they usually enable CONFIG_EXPERT and CONFIG_CHECKPOINT_RESTORE. >> But Arch does not enable CONFIG_EXPERT or CONFIG_CHECKPOINT_RESTORE. >> >> However, the children proc file is useful outside of checkpoint restore. >> I would like to use it in rkt. The rkt process exec() another program it >> does not control, and that other program will fork()+exec() a child >> process. I would like to find the pid of the child process from an >> external tool without iterating in /proc over all processes to find >> which one has a parent pid equal to rkt. >> >> Since the children proc file is useful outside of checkpoint-restore, >> I am removing the guard on CONFIG_CHECKPOINT_RESTORE. > > I sent an essentially identical patch a couple years ago, and it got > some interesting comments: > > http://lkml.kernel.org/g/0e00e9073855c02a382d49ba1ede9c4fda3451b7.1372189875.git.l...@amacapital.net
Thanks for the pointer, I didn't see it. > See also: > > http://lkml.kernel.org/g/5f9a6b3ab75b12f2c5ba61ea1f6f3b08e9952b55.1372280661.git.l...@amacapital.net Your paragraph seems good to have in the documentation but I am also not qualified to comment on the behavior. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
