linux-kernel - Re: [PATCH] uprobes: Add exports for module use

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Message-ID: <20130112163840.GA19987@redhat.com>
Date:	Sat, 12 Jan 2013 17:38:40 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Josh Stone <jistone@...hat.com>, srikar@...ux.vnet.ibm.com,
	mingo@...nel.org, peterz@...radead.org, anton@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes: Add exports for module use

On 01/11, Christoph Hellwig wrote:
>
> On Thu, Jan 10, 2013 at 03:01:46PM -0800, Josh Stone wrote:
> > The original pull message for uprobes (commit 654443e2) noted:
> >
> >   This tree includes uprobes support in 'perf probe' - but SystemTap
> >   (and other tools) can take advantage of user probe points as well.
> >
> > In order to actually be usable in module-based tools like SystemTap, the
> > interface needs to be exported.  This patch first adds the obvious
> > exports for uprobe_register and uprobe_unregister.  Then it also adds
> > one for task_user_regset_view, which is necessary to get the correct
> > state of userspace registers.
>
> Get systemtap into the mainline kernel tree and we can talk.

I can't understand your reply.

Looks like, you do not like the fact that uprobes can be used by the out
of tree modules. Why?

And why, say, kprobe_register() is exported then? Afaics, it does not
have any modular in-kernel user.

As for systemtap in particular. I never used it, and probably you didn't.
But it has a lot of users, and I know many people who find it very useful.

Oleg.

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