linux-kernel - Re: [PATCH 0/6] enable creating [k,u]probe with perf_event

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Message-ID: <20171122050045.cjt4legewplt3yet@ast-mbp>
Date:   Tue, 21 Nov 2017 21:00:47 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     peterz@...radead.org, rostedt@...dmis.org, mingo@...hat.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, daniel@...earbox.net,
        kernel-team@...com
Subject: Re: [PATCH 0/6] enable creating [k,u]probe with perf_event_open

On Wed, Nov 15, 2017 at 09:23:31AM -0800, Song Liu wrote:
> Changes RFC v2 to PATCH v1:
>   Check type PERF_TYPE_PROBE in perf_event_set_filter().
>   Rebase on to tip perf/core.
> 
> Changes RFC v1 to RFC v2:
>   Fix build issue reported by kbuild test bot by adding ifdef of
>   CONFIG_KPROBE_EVENTS, and CONFIG_UPROBE_EVENTS.
> 
> RFC v1 cover letter:
> 
> This is to follow up the discussion over "new kprobe api" at Linux
> Plumbers 2017:
> 
> With current kernel, user space tools can only create/destroy [k,u]probes
> with a text-based API (kprobe_events and uprobe_events in tracefs). This
> approach relies on user space to clean up the [k,u]probe after using them.
> However, this is not easy for user space to clean up properly.
> 
> To solve this problem, we introduce a file descriptor based API.
> Specifically, we extended perf_event_open to create [k,u]probe, and attach
> this [k,u]probe to the file descriptor created by perf_event_open. These
> [k,u]probe are associated with this file descriptor, so they are not
> available in tracefs.

Peter, Ingo,
could you please review the proposed perf_event_open api extension?