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8294266: Add a way to pre-touch java thread stacks

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Reviewed-by: rehn, gziemski
This commit is contained in:
Thomas Stuefe 2023-04-02 06:21:30 +00:00
parent 41a3db267d
commit b8c748dbe4
4 changed files with 153 additions and 0 deletions
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23
src/hotspot/share/runtime/javaThread.cpp
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@ -693,6 +693,10 @@ void JavaThread::run() {
}
if (AlwaysPreTouchStacks) {
pretouch_stack();
}
// We call another function to do the rest so we are sure that the stack addresses used
// from there will be lower than the stack base just computed.
thread_main_inner();
@ -2119,6 +2123,25 @@ void JavaThread::vm_exit_on_osthread_failure(JavaThread* thread) {
}
}
void JavaThread::pretouch_stack() {
// Given an established java thread stack with usable area followed by
// shadow zone and reserved/yellow/red zone, pretouch the usable area ranging
// from the current frame down to the start of the shadow zone.
const address end = _stack_overflow_state.shadow_zone_safe_limit();
if (is_in_full_stack(end)) {
char* p1 = (char*) alloca(1);
address here = (address) &p1;
if (is_in_full_stack(here) && here > end) {
size_t to_alloc = here - end;
char* p2 = (char*) alloca(to_alloc);
log_trace(os, thread)("Pretouching thread stack from " PTR_FORMAT " to " PTR_FORMAT ".",
p2i(p2), p2i(end));
os::pretouch_memory(p2, p2 + to_alloc,
NOT_AIX(os::vm_page_size()) AIX_ONLY(4096));
}
}
}
// Deferred OopHandle release support.
class OopHandleList : public CHeapObj<mtInternal> {