linux-kernel - Re: [PATCH 0/4] uprobes: Teach debug/tracing/uprobe

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Message-ID: <20130131170412.GA14017@redhat.com>
Date:	Thu, 31 Jan 2013 18:04:12 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	Anton Arapov <anton@...hat.com>, Frank Eigler <fche@...hat.com>,
	Josh Stone <jistone@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] uprobes: Teach debug/tracing/uprobe_events to do
	the filtering

On 01/27, Oleg Nesterov wrote:
>
> Based on git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc uprobes/core
> on top of pre-filtering patches in kernel/uprobes.c.
>
> Please review.

Self-NACK.

Everything seems to work, including the additional cleanupe I sent,
but:

> After that I'll try to change tools/perf to use this new feature.

this can't help perf.

I never used it before so I naively thought that it writes to
tracing/uprobe_events and does perf_event_open(id) in the single
session, but this is not true.

I'll try to do something else. It seems that we can use
TRACE_REG_PERF_OPEN rather than TRACE_REG_PERF_REGISTER and
exploit event->ctx->task->mm to implement the pre-filtering...

Oleg.

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