Where's 9.1's malloc?

[Mouse <mouse%Rodents-Montreal.ORG@localhost>]

Where is the source for 9.1's malloc implementation?

nm -o on /usr/lib/libc.a says malloc is defined in jemalloc.o.  I find
two jemalloc.c files in the source tree, one in lib/libc/stdlib and one
in external/bsd/jemalloc/dist/src.  I changed the former one and the
changes did not actually appear in libc, so I infer the latter must be
the one getting used.  On looking at the build log, I see it being
built - but the result appears to be going into libjemalloc, not libc,
leading me to think I'm missing something.  I also see no reason for
lib/libc/stdlib/jemalloc.c to exist if it's not getting used.

My most immediate question is, what file should I be hacking on to
fiddle the malloc implementation found in libc?

My experience has been that things I don't understand typically come
back to bite me, so, I'd also like to know, what am I missing?

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