Re: [PATCH] Add tracepoints to track pagecache transition

KOSAKI Motohiro
2009-02-18T00:29:08Z

Hi Frederic,

> > And, both function is freqentlly called one.
> > I worry about performance issue. can you prove no degression?
>
> It would be very hard to prove. Tracepoints are very cheap in that they only
> add the overhead of a single branch check while off.

this is typical reviewing comment.

Memory folks adage says,
Don't believe theory, you believe benchmark result.

I don't oppose your theorical background opinion :)

> But are there some plans about writing a tracer or so for pagecache?