The strace output is attached. I don't pretend to understand all of it,
but there are some things I did not expect, like the SIGSEGVs!? What is
the significance of all the calls to mprotect?
Generational garbage collection. :-)
And the SIGSEGVs ?
SIGSEGVs are writes to the oldspace. The SIGSEGV handler marks the page
as having a reference to new objects, and unprotects it so that it does
not cause further SIGSEGVs.
At garbage collection time, if the page does not have any other
references to new objects, it is protected again.
Paolo
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