linux-kernel - Re: [PATCH v2 RESEND] trace_uprobe: support reference counter in fd-based uprobe

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Message-ID: <20181002081206.GS3439@hirez.programming.kicks-ass.net>
Date:   Tue, 2 Oct 2018 10:12:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 RESEND] trace_uprobe: support reference counter in
 fd-based uprobe

On Mon, Oct 01, 2018 at 10:36:36PM -0700, Song Liu wrote:
> Changes v1 -> v2: Fix PMU_FORMAT_ATTR as Peter suggested
> 
> This patch enables uprobes with reference counter in fd-based uprobe.
> Highest 32 bits of perf_event_attr.config is used to stored offset
> of the reference count (semaphore).
> 
> Format information in /sys/bus/event_source/devices/uprobe/format/ is
> updated to reflect this new feature.
> 
> Signed-off-by: Song Liu <songliubraving@...com>
> Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>

Works for me,

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>