linux-kernel - Re: [RFC PATCH] vfs: optimization to /proc/<pid>/mountinfo patch

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Message-Id: <1202715391.1942.9.camel@ram.us.ibm.com>
Date:	Sun, 10 Feb 2008 23:36:31 -0800
From:	Ram Pai <linuxram@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, viro@....linux.org.uk,
	a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH] vfs: optimization to /proc/<pid>/mountinfo patch

On Mon, 2008-02-04 at 01:28 -0800, Andrew Morton wrote:
> On Mon, 04 Feb 2008 01:15:05 -0800 Ram Pai <linuxram@...ibm.com> wrote:
> 
> > 1) reports deleted inode in dentry_path() consistent with that in __d_path()
> > 2) modified __d_path() to use prepend(), reducing the size of __d_path()
> > 3) moved all the functionality that reports mount information in /proc under
> > 	CONFIG_PROC_FS.
> > 
> > Could not verify if the code would work with CONFIG_PROC_FS=n, since it was
> > impossible to disable CONFIG_PROC_FS. Looking for ideas on how to disable
> > CONFIG_PROC_FS.

this worked. thanks. There was one place in ipv4 that failed compilation
with proc_fs disabled. Fixed that. Otherwise everything compiled
cleanly.

> 
> Do `make menuconfig', then hit '/' and search for "proc_fs".
> 
> It'll tell you that you need to set EMBEDDED=y to disable procfs.
> 
> >  fs/dcache.c              |   59 +++++++++++++++++++----------------------------
> >  fs/namespace.c           |    2 +
> >  fs/seq_file.c            |    2 +
> >  include/linux/dcache.h   |    3 ++
> >  include/linux/seq_file.h |    3 ++
> 
> Please resend after testing that, thanks.

with procfs disabled, the boot fails, since nash(fedora's startup
script) which links with libc.so library has dependencies on /proc. Nash
segfaults and so does init.  looking for ideas.

without passing this hurdle, its hard to test the patch :(
RP

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