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Date: Thu, 24 Jan 2013 09:05:46 -0800
From: Josh Stone <jistone@redhat.com>
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To: Oleg Nesterov <oleg@redhat.com>
CC: Ingo Molnar <mingo@kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Anton Arapov <anton@redhat.com>, Christoph Hellwig <hch@infradead.org>,
        Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL] uprobes: pre-filtering
References: <20130113185916.GA25831@redhat.com> <20130124121720.GA3104@gmail.com> <20130124154018.GA8580@redhat.com>
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On 01/24/2013 07:40 AM, Oleg Nesterov wrote:
> 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.

Even without changing perf's interface, it already has constraints for
its child processes (versus --all-cpus) or for specific pid/tid/uid.
Pre-filtering could help enforce and optimize those constraints.