Re: [PATCH] Add tracepoints to track pagecache transition

[KOSAKI Motohiro]

>> If you want to see I/O activity, you need to add tracepoint into block
>> layer.
>
> We already have that, Arnaldo converted blktrace to use tracepoints and
> wrote an ftrace tracer for it.

Yup. I agree I selected wrong word.
My point is, if he want to know I/O delaying reason, the number of the
cache pages seems unrelated thing.
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