Re: [RFC PATCH] bpf: Add new bpf map type for timer

[Alexei Starovoitov]

On 10/21/15 3:02 AM, He Kuang wrote:
> Here's a hypothetical scenario to illustrate the use of timer map.
>
> A video frame is updated between frame_refresh_start() and
> frame_refresh_end(), in most cases, the interval between these two
> functions is less than 40ms, but occasionally over 200ms.
>
> We can set a timer which alarm after the frame_refresh_start() has
> been executed 42ms(slightly larger than 40ms) and destory this timer
> if frame_refresh_end() is called. So, for most cases, the timer is not
> triggered, this can significantly reduce the amount of trace data.

As a feature it sounds useful, but implementation is not acceptable.
You cannot have one callback stub for all users of this feature.

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