Rusty Russell 6a8e586ea8 trace: don't use randombytes_buf(), use pseudorand. ...

This is much faster to give 64 bits of data, and we don't need
cryptographic randomness.

This brings us back to 413ns per trace.

Before:
	real	0m5.819000-6.472000(6.2064+/-0.26)s
	user	0m3.779000-4.101000(3.956+/-0.12)s
	sys	0m2.040000-2.431000(2.2496+/-0.15)s

After:
	real	0m3.981000-4.247000(4.1276+/-0.11)s
	user	0m3.979000-4.245000(4.126+/-0.11)s
	sys	0m0.000000-0.002000(0.001+/-0.00063)s

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Fixed: lightingd: trimmed overhead of tracing infrastructure.

2025-04-23 13:45:18 +09:30

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