linux-kernel - Re: [GIT PULL] uprobes: pre-filtering

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Message-ID: <20130124170612.GA14823@redhat.com>
Date:	Thu, 24 Jan 2013 18:06:12 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Anton Arapov <anton@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Josh Stone <jistone@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] uprobes: pre-filtering

On 01/24, Ingo Molnar wrote:
>
> * Oleg Nesterov <oleg@...hat.com> wrote:
>
> > Unfortunately, currently there is no in-kernel user of
> > pre-filtering.
> >
> > I'll try to implement the pid-base filtering at least for
> > tracing/uprobe_events, but this needs a time. Not only I am
> > not familiar with this code, I am not sure how this interface
> > should actually look. And I agree, perf should be able to use
> > it somehow, perhaps at least to allow to probe a single
> > task/mm.
>
> Would be nice to get something minimal/simple going, so that it
> can be tested, etc.

Heh, I understand.

I do not see anything simple to implement... I'll try to think.
Srikar, do you have any idea?

All I can say right now: I'll send you the patches when I have them ;)
Can't promise this will be soon.

_Perhaps_, as a first step, we can simply change create_trace_uprobe()
so that it would be possible to specify list-of-pids at creation time...
Not sure this actually makes sense.

Oleg.

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