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

[Song Liu]

> On Oct 2, 2018, at 1:12 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
> 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@xxxxxx>
>> Reviewed-and-tested-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
>> Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
>> Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
>> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> 
> Works for me,
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>

Thanks Peter!

Steven, could you please test/apply this? 

Best,
Song