RE: "struct perf_sample_data" alignment

[David Laight]

...
> What I remember is that since perf_sample_data is fairly large,
> unconditionally initializing the whole thing is *slow* (and
> -fauto-var-init=zero will hurt here).

That will hurt everywhere.
I can also imagine it hiding bugs and making people
shrink on-stack arrays to the point where they either overrun
or cause an unexpected error or string truncation.

Initialising to zero is a bad choice if the aim is to
avoid leaking stack.

	David

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