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src/share/vm/runtime/virtualspace.cpp
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rev 7555 : imported patch 8067469-g1-ignores-alwayspretouch
@@ -613,23 +613,11 @@
_upper_high += upper_needs;
}
}
if (pre_touch || AlwaysPreTouch) {
- int vm_ps = os::vm_page_size();
- for (char* curr = previous_high;
- curr < unaligned_new_high;
- curr += vm_ps) {
- // Note the use of a write here; originally we tried just a read, but
- // since the value read was unused, the optimizer removed the read.
- // If we ever have a concurrent touchahead thread, we'll want to use
- // a read, to avoid the potential of overwriting data (if a mutator
- // thread beats the touchahead thread to a page). There are various
- // ways of making sure this read is not optimized away: for example,
- // generating the code for a read procedure at runtime.
- *curr = 0;
- }
+ os::pretouch_memory(previous_high, unaligned_new_high);
}
_high += bytes;
return true;
}
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