Zdenek Kotala <[email protected]> writes:
> [...]
> + header = (StandardChunkHeader *)
> + ((char *) ret - STANDARDCHUNKHEADERSIZE);
> +
> +// TRACE_POSTGRESQL_MCXT_ALLOC(context->name, context, size, header->size,
> true);
> +
> [...]
If the dormant overhead of these probes is measured or suspected to be
excessive, consider using the dtrace-generated per-probe foo_ENABLED()
conditional, or a postgres configuration global thusly:
if (__builtin_expect(TRACE_POSTGRESQL_MCXT_ALLOC_ENABLED(), 0))
TRACE_POSTGRESQL_MCXT_ALLOC(...);
so that the whole instrumentation parameter setup/call can be placed
out of the hot line with gcc -freorder-blocks.
- FChE
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