linux-kernel - Re: Detailed Stack Information Patch [0/3]

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Date:	Thu, 22 Jan 2009 22:39:28 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Jörn Engel <joern@...fs.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Detailed Stack Information Patch [0/3]

First, i had explained what is the reason for the patch.

Second, the number of #ifdef is not more or less than other features
which extends the task_struct on demand.

There is no way to do this without #ifdef's, only if i add this feature
without a CONFIG_.... option.

I think the main reason why i get low responses is, because i posted it
to the wrong mail list. kernel-mm would be a better place for this.

So i will wait until 2.6.29 is out, then move my patch to this version,
enhance it, add a diffstat and try it again which are more detailed
reason why this patch should be included.

But this patch did nit solve a problem, it is a feature like
PROC_PAGE_MONITOR or similar. It will help to figure out, how much stack
will be consumed by a particular process or thread.

It also not a patch which cares Joe Kernelhacker, it cares Jane
Userlandhacker!

Thnx,
Steffi

Am Donnerstag, den 22.01.2009, 20:41 +0100 schrieb Jörn Engel:
> On Tue, 20 January 2009 11:16:37 +0100, Stefani Seibold wrote:
> > 
> > this is a patch which give you a better overview of the userland
> > application stack usage, especially for embedded linux.
> > 
> > Currently you are only able to dump the main process/thread stack usage
> > which is showed in proc/pid/status by the "VmStk" Value. But you get no
> > information about the consumed stack memory of the the threads.
> >
> > [...]
> > 
> > This patch is against 2.6.28.1. The patch is cpu independent, so it
> > should work on all linux supported architectures, it was tested under
> > x86 and powerpc. Also there is not dependency a library: glibc, uclibc
> > and all other should work.
> > 
> > I hope you like it and want ask what is necessary for inclusion into the
> > main stream kernel or linux-next? If you have ideas how to do things in
> > a better way, please let me know.
> 
> First goal would be to get people interested.  Why would Joe
> Kernelhacker care about this, what problem would it solve for him?  Next
> goal is to prove to akpm that the solved problems are worth the
> maintenance burden this code brings.
> 
> It would be nice to have diffstat added to each patch to give people
> a quick overview.  More importantly, the number of #ifdef's in the
> patches may raise a red flag.  You should try to remove them from common
> code and have a single one in the headers:
> 
> #ifdef CONFIG_NEW_FEATURE
> 
> void handle_this(int foo, long bar);
> 
> #else
> 
> static inline void handle_this(int foo, long bar)
> {
> }
> #endif
> 
> Not sure what else to say.  I'm still wondering whether it will solve a
> problem for me.
> 
> Jörn
> 

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