archive mirror
 help / color / mirror / Atom feed
From: Samuel Thibault <>
To: Alan Cox <>
Cc: Linux Kernel Mailing List <>
Subject: Re: [RFC] single return paradigm
Date: Tue, 29 Jul 2003 21:02:12 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Le dim 27 jui 2003 11:43:22 GMT, Alan Cox a tapoté sur son clavier :
> On Sad, 2003-07-26 at 23:16, Samuel Thibault wrote:
> > The "single return" paradigm of drivers/char/vt.c:tioclinux() surprised
> > me at first glance. But I'm now trying to maintain a patch which adds
> > probes at entry and exit of functions for performance instrumenting
> gcc will already dop that for you

Indeed. The thing is that this automatic call only gives you the
function address and its caller site (yes, it couldn't give much more),
so you have to lookup symbols in the, you can't do this with
modules (at least for non-exported functions which don't appear in
/proc/ksyms), and you can't get the return code.

I'll yet add this possibility for quickly adding tracing to a particular
file by just adding CFLAGS_file.o=-finstrument-functions to the Makefile,
before progressively replacing it by hand-written probes with the wanted
parameters. The single-exit issue still remains then.

Thanks anyway,

  reply	other threads:[~2003-07-30  1:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-26 22:16 [RFC] single return paradigm Samuel Thibault
2003-07-27 10:43 ` Alan Cox
2003-07-30  1:02   ` Samuel Thibault [this message]
2003-08-17  1:10   ` Richard Henderson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).