[ltt-dev] [PATCH v5 0/5] Debugfs-based ltt trace controller

[Zhaolei]

Hello, Mathieu

This is v5 of debugfs-based ltt trace controller.

>> > But IMHO, mode is not necessary now, because we can control each channel's
>> > overwrite.
>> > So maybe I'd like to remove conception of "mode" in ltt's kernel source.
>> > It will delete some struct member, some function, and modify some function,
>> > so we can do it with another patch.
>> > User-mode tools can have conception of "mode". They can set each channel's
>> > overwrite attribute by mode.
>> > (OR let user-mode tools get rid of  conception of mode, and control each
>> > channel's overwrite attribute directly)
>> > 
> 
> Yes, the "mode" concept can go away form the kernel, it's not required
> anymore. Having one "overwrite" per channel is a superset of "mode"
> (flight, normal, hybrid) which is basically just fixing overwrite modes
> to specific channels.
> 
> If you plan to leave a "mode" file for transition (I don't think it is
> necessary), it should not go into
> debugfs/control/trace_name/channel/cpu/mode
> 
> but rather in
> 
> debugfs/control/trace_name/mode
> 
> because it fixes the mode for the whole trace, not only for a particular
> channel.
Concept of "mode" is removed from ltt-kernel and ltt-trace-control.

Other small fix(as ctrate -> create in comment) are also included.

We may begin to work on ltt-user-space tools after it got merged.

Thanks!