linux-kernel - Re: [REVIEW][PATCH 0/4] /proc/thread-self

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Message-ID: <53DB3790.7020600@infradead.org>
Date:	Thu, 31 Jul 2014 23:45:36 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.linux-foundation.org>
CC:	linux-api@...r.kernel.org,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [REVIEW][PATCH 0/4] /proc/thread-self

On 07/31/14 17:30, Eric W. Biederman wrote:
> 
> This patchset implements /proc/thread-self a magic symlink that
> solves a couple of problems.
> 
> - It makes it easy to get to a specific threads directory in /proc
>   with gettid() not being exported in glibc this is currently a pain.
> 
> - It allows fixing the problem present in /proc/mounts and /proc/net
>   that when the thread group leader exits but the entire thread group
>   remains /proc/self/net and /proc/self/mounts and thus /proc/mounts and
>   /proc/net become empty.
> 
> - As mount and network namespaces are per thread it allows /proc/net and
>   /proc/mounts to reflect this.

Hi Eric,

Any changes/additions to Documentation/ ?

Thanks.

> This is small chance changing /proc/net and /proc/mounts will cause
> userspace regressions (although nothing has shown up in my testing) if
> that happens we can just point the change that moves them from
> /proc/self/... to /proc/thread-self/...
> 
> Eric W. Biederman (4):
>       proc: Have net show up under /proc/<tgid>/task/<tid>
>       proc: Implement /proc/thread-self to point at the directory of the current thread
>       proc: Point /proc/net at /proc/thread-self/net instead of /proc/self/net
>       proc: Point /proc/mounts at /proc/thread-self/mounts instead of /proc/self/mounts
> 
>  fs/proc/Makefile              |  1 +
>  fs/proc/base.c                | 18 ++++++---
>  fs/proc/inode.c               |  7 +++-
>  fs/proc/internal.h            |  6 +++
>  fs/proc/proc_net.c            |  2 +-
>  fs/proc/root.c                |  5 ++-
>  fs/proc/thread_self.c         | 85 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/pid_namespace.h |  1 +
>  8 files changed, 117 insertions(+), 8 deletions(-)


-- 
~Randy
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