void G1PageBasedVirtualSpace::print_on(outputStream* out) {
out->print ("Virtual space:");
if (special()) out->print(" (pinned in memory)");
out->cr();
out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary));
}
void ReservedMemoryRegion::set_flag(MEMFLAGS f) {
assert((flag() == mtNone || flag() == f), "Overwrite memory type");
if (flag() != f) {
VirtualMemorySummary::move_reserved_memory(flag(), f, size());
VirtualMemorySummary::move_committed_memory(flag(), f, committed_size());
_flag = f;
}
}
void VirtualSpace::print() {
tty->print ("Virtual space:");
if (special()) tty->print(" (pinned in memory)");
tty->cr();
tty->print_cr(" - committed: " SIZE_FORMAT, committed_size());
tty->print_cr(" - reserved: " SIZE_FORMAT, reserved_size());
tty->print_cr(" - [low, high]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low(), high());
tty->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", low_boundary(), high_boundary());
}
bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
assert(is_aligned(bytes), "arg not aligned");
DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
if (committed_size() < bytes) {
return false;
}
char* const base_addr = committed_low_addr();
os::uncommit_memory(base_addr,bytes,Modules::ParGC_PSVirtualSpace);
return true;
}
void PSVirtualSpace::print() const {
gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
SIZE_FORMAT "K grows %s",
this, alignment() / K, grows_up() ? "up" : "down");
gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
" [" PTR_FORMAT "," PTR_FORMAT "]"
" committed=" SIZE_FORMAT "K"
" [" PTR_FORMAT "," PTR_FORMAT "]",
reserved_size() / K,
reserved_low_addr(), reserved_high_addr(),
committed_size() / K,
committed_low_addr(), committed_high_addr());
}
void PSVirtualSpace::print() const {
gclog_or_tty->print_cr("virtual space [" PTR_FORMAT "]: alignment="
SIZE_FORMAT "K grows %s%s",
p2i(this), alignment() / K, grows_up() ? "up" : "down",
special() ? " (pinned in memory)" : "");
gclog_or_tty->print_cr(" reserved=" SIZE_FORMAT "K"
" [" PTR_FORMAT "," PTR_FORMAT "]"
" committed=" SIZE_FORMAT "K"
" [" PTR_FORMAT "," PTR_FORMAT "]",
reserved_size() / K,
p2i(reserved_low_addr()), p2i(reserved_high_addr()),
committed_size() / K,
p2i(committed_low_addr()), p2i(committed_high_addr()));
}
bool PSVirtualSpaceHighToLow::shrink_by(size_t bytes) {
assert(is_aligned(bytes), "arg not aligned");
DEBUG_ONLY(PSVirtualSpaceVerifier this_verifier(this));
if (committed_size() < bytes) {
return false;
}
char* const base_addr = committed_low_addr();
bool result = special() || os::uncommit_memory(base_addr, bytes);
if (result) {
_committed_low_addr += bytes;
}
return result;
}
size_t G1PageBasedVirtualSpace::uncommitted_size() const {
return reserved_size() - committed_size();
}
inline size_t PSVirtualSpace::uncommitted_size() const {
return reserved_size() - committed_size();
}
// A page is uncommitted if the contents of the entire page is deemed unusable.
// Continue to decrement the high() pointer until it reaches a page boundary
// in which case that particular page can now be uncommitted.
void VirtualSpace::shrink_by(size_t size) {
if (committed_size() < size)
fatal("Cannot shrink virtual space to negative size");
if (special()) {
// don't uncommit if the entire space is pinned in memory
_high -= size;
return;
}
char* unaligned_new_high = high() - size;
assert(unaligned_new_high >= low_boundary(), "cannot shrink past lower boundary");
// Calculate new unaligned address
char* unaligned_upper_new_high =
MAX2(unaligned_new_high, middle_high_boundary());
char* unaligned_middle_new_high =
MAX2(unaligned_new_high, lower_high_boundary());
char* unaligned_lower_new_high =
MAX2(unaligned_new_high, low_boundary());
// Align address to region's alignment
char* aligned_upper_new_high =
(char*) round_to((intptr_t) unaligned_upper_new_high, upper_alignment());
char* aligned_middle_new_high =
(char*) round_to((intptr_t) unaligned_middle_new_high, middle_alignment());
char* aligned_lower_new_high =
(char*) round_to((intptr_t) unaligned_lower_new_high, lower_alignment());
// Determine which regions need to shrink
size_t upper_needs = 0;
if (aligned_upper_new_high < upper_high()) {
upper_needs =
pointer_delta(upper_high(), aligned_upper_new_high, sizeof(char));
}
size_t middle_needs = 0;
if (aligned_middle_new_high < middle_high()) {
middle_needs =
pointer_delta(middle_high(), aligned_middle_new_high, sizeof(char));
}
size_t lower_needs = 0;
if (aligned_lower_new_high < lower_high()) {
lower_needs =
pointer_delta(lower_high(), aligned_lower_new_high, sizeof(char));
}
// Check contiguity.
assert(middle_high_boundary() <= upper_high() &&
upper_high() <= upper_high_boundary(),
"high address must be contained within the region");
assert(lower_high_boundary() <= middle_high() &&
middle_high() <= middle_high_boundary(),
"high address must be contained within the region");
assert(low_boundary() <= lower_high() &&
lower_high() <= lower_high_boundary(),
"high address must be contained within the region");
// Uncommit
if (upper_needs > 0) {
assert(middle_high_boundary() <= aligned_upper_new_high &&
aligned_upper_new_high + upper_needs <= upper_high_boundary(),
"must not shrink beyond region");
if (!os::uncommit_memory(aligned_upper_new_high, upper_needs)) {
debug_only(warning("os::uncommit_memory failed"));
return;
} else {
_upper_high -= upper_needs;
}
}
if (middle_needs > 0) {
assert(lower_high_boundary() <= aligned_middle_new_high &&
aligned_middle_new_high + middle_needs <= middle_high_boundary(),
"must not shrink beyond region");
if (!os::uncommit_memory(aligned_middle_new_high, middle_needs)) {
debug_only(warning("os::uncommit_memory failed"));
return;
} else {
_middle_high -= middle_needs;
}
}
if (lower_needs > 0) {
assert(low_boundary() <= aligned_lower_new_high &&
aligned_lower_new_high + lower_needs <= lower_high_boundary(),
"must not shrink beyond region");
if (!os::uncommit_memory(aligned_lower_new_high, lower_needs)) {
debug_only(warning("os::uncommit_memory failed"));
return;
} else {
_lower_high -= lower_needs;
}
}
_high -= size;
}
