linux-kernel - Re: sys_write() racy for multi-threaded append?

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Message-ID: <y0mhcsldtq4.fsf@ton.toronto.redhat.com>
Date:	16 Mar 2007 12:43:47 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	"Michael K. Edwards" <medwards.linux@...il.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Bodo Eggert" <7eggert@....de>,
	"Eric Dumazet" <dada1@...mosbay.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: sys_write() racy for multi-threaded append?

"Michael K. Edwards" <medwards.linux@...il.com> writes:

> Thanks Alan, this is really helpful -- I'll see if I can figure out
> kprobes.  It is not immediately obvious to me how to use them to
> trace function calls in userspace, but I'll read up.

kprobes does not work with userspace.  We in systemtap land have been
pushing for such an extension, and primarily IBM folks have been
writing one that would be acceptable for LKML.

> [...]  There doesn't seem to be an arch/arm/kernel/kprobes.c, and
> I'm not sure I have the skill to write one.  On the other hand,
> ltrace manages something similar (through libelf), and I can trace
> ltrace's ptrace activity with strace, so maybe I can clone that.
> :-)

Efforts are underway to port kprobes to ARM.

Both these efforts may be tracked on the public systemtap mailing list.

- FChE
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