in src/hotspot/share/code/codeHeapState.cpp [512:1222]
void CodeHeapState::aggregate(outputStream* out, CodeHeap* heap, size_t granularity) {
unsigned int nBlocks_free = 0;
unsigned int nBlocks_used = 0;
unsigned int nBlocks_zomb = 0;
unsigned int nBlocks_disconn = 0;
unsigned int nBlocks_notentr = 0;
//---< max & min of TopSizeArray >---
// it is sufficient to have these sizes as 32bit unsigned ints.
// The CodeHeap is limited in size to 4GB. Furthermore, the sizes
// are stored in _segment_size units, scaling them down by a factor of 64 (at least).
unsigned int currMax = 0;
unsigned int currMin = 0;
unsigned int currMin_ix = 0;
unsigned long total_iterations = 0;
bool done = false;
const int min_granules = 256;
const int max_granules = 512*K; // limits analyzable CodeHeap (with segment_granules) to 32M..128M
// results in StatArray size of 24M (= max_granules * 48 Bytes per element)
// For a 1GB CodeHeap, the granule size must be at least 2kB to not violate the max_granles limit.
const char* heapName = get_heapName(heap);
BUFFEREDSTREAM_DECL(ast, out)
if (!initialization_complete) {
memset(CodeHeapStatArray, 0, sizeof(CodeHeapStatArray));
initialization_complete = true;
printBox(ast, '=', "C O D E H E A P A N A L Y S I S (general remarks)", nullptr);
ast->print_cr(" The code heap analysis function provides deep insights into\n"
" the inner workings and the internal state of the Java VM's\n"
" code cache - the place where all the JVM generated machine\n"
" code is stored.\n"
" \n"
" This function is designed and provided for support engineers\n"
" to help them understand and solve issues in customer systems.\n"
" It is not intended for use and interpretation by other persons.\n"
" \n");
BUFFEREDSTREAM_FLUSH("")
}
get_HeapStatGlobals(out, heapName);
// Since we are (and must be) analyzing the CodeHeap contents under the CodeCache_lock,
// all heap information is "constant" and can be safely extracted/calculated before we
// enter the while() loop. Actually, the loop will only be iterated once.
char* low_bound = heap->low_boundary();
size_t size = heap->capacity();
size_t res_size = heap->max_capacity();
seg_size = heap->segment_size();
log2_seg_size = seg_size == 0 ? 0 : exact_log2(seg_size); // This is a global static value.
if (seg_size == 0) {
printBox(ast, '-', "Heap not fully initialized yet, segment size is zero for segment ", heapName);
BUFFEREDSTREAM_FLUSH("")
return;
}
if (!holding_required_locks()) {
printBox(ast, '-', "Must be at safepoint or hold Compile_lock and CodeCache_lock when calling aggregate function for ", heapName);
BUFFEREDSTREAM_FLUSH("")
return;
}
// Calculate granularity of analysis (and output).
// The CodeHeap is managed (allocated) in segments (units) of CodeCacheSegmentSize.
// The CodeHeap can become fairly large, in particular in productive real-life systems.
//
// It is often neither feasible nor desirable to aggregate the data with the highest possible
// level of detail, i.e. inspecting and printing each segment on its own.
//
// The granularity parameter allows to specify the level of detail available in the analysis.
// It must be a positive multiple of the segment size and should be selected such that enough
// detail is provided while, at the same time, the printed output does not explode.
//
// By manipulating the granularity value, we enforce that at least min_granules units
// of analysis are available. We also enforce an upper limit of max_granules units to
// keep the amount of allocated storage in check.
//
// Finally, we adjust the granularity such that each granule covers at most 64k-1 segments.
// This is necessary to prevent an unsigned short overflow while accumulating space information.
//
assert(granularity > 0, "granularity should be positive.");
if (granularity > size) {
granularity = size;
}
if (size/granularity < min_granules) {
granularity = size/min_granules; // at least min_granules granules
}
granularity = granularity & (~(seg_size - 1)); // must be multiple of seg_size
if (granularity < seg_size) {
granularity = seg_size; // must be at least seg_size
}
if (size/granularity > max_granules) {
granularity = size/max_granules; // at most max_granules granules
}
granularity = granularity & (~(seg_size - 1)); // must be multiple of seg_size
if (granularity>>log2_seg_size >= (1L<<sizeof(unsigned short)*8)) {
granularity = ((1L<<(sizeof(unsigned short)*8))-1)<<log2_seg_size; // Limit: (64k-1) * seg_size
}
segment_granules = granularity == seg_size;
size_t granules = (size + (granularity-1))/granularity;
printBox(ast, '=', "C O D E H E A P A N A L Y S I S (used blocks) for segment ", heapName);
ast->print_cr(" The aggregate step takes an aggregated snapshot of the CodeHeap.\n"
" Subsequent print functions create their output based on this snapshot.\n"
" The CodeHeap is a living thing, and every effort has been made for the\n"
" collected data to be consistent. Only the method names and signatures\n"
" are retrieved at print time. That may lead to rare cases where the\n"
" name of a method is no longer available, e.g. because it was unloaded.\n");
ast->print_cr(" CodeHeap committed size %zuK (%zuM), reserved size %zuK (%zuM), %d%% occupied.",
size/(size_t)K, size/(size_t)M, res_size/(size_t)K, res_size/(size_t)M, (unsigned int)(100.0*size/res_size));
ast->print_cr(" CodeHeap allocation segment size is %zu bytes. This is the smallest possible granularity.", seg_size);
ast->print_cr(" CodeHeap (committed part) is mapped to %zu granules of size %zu bytes.", granules, granularity);
ast->print_cr(" Each granule takes %zu bytes of C heap, that is %zuK in total for statistics data.", sizeof(StatElement), (sizeof(StatElement)*granules)/(size_t)K);
ast->print_cr(" The number of granules is limited to %dk, requiring a granules size of at least %d bytes for a 1GB heap.", (unsigned int)(max_granules/K), (unsigned int)(G/max_granules));
BUFFEREDSTREAM_FLUSH("\n")
while (!done) {
//---< reset counters with every aggregation >---
nBlocks_t1 = 0;
nBlocks_t2 = 0;
nBlocks_alive = 0;
nBlocks_stub = 0;
nBlocks_free = 0;
nBlocks_used = 0;
nBlocks_zomb = 0;
nBlocks_disconn = 0;
nBlocks_notentr = 0;
//---< discard old arrays if size does not match >---
if (granules != alloc_granules) {
discard_StatArray(out);
discard_TopSizeArray(out);
}
//---< allocate arrays if they don't yet exist, initialize >---
prepare_StatArray(out, granules, granularity, heapName);
if (StatArray == nullptr) {
set_HeapStatGlobals(out, heapName);
return;
}
prepare_TopSizeArray(out, maxTopSizeBlocks, heapName);
prepare_SizeDistArray(out, nSizeDistElements, heapName);
latest_compilation_id = CompileBroker::get_compilation_id();
int highest_compilation_id = 0;
size_t usedSpace = 0;
size_t t1Space = 0;
size_t t2Space = 0;
size_t aliveSpace = 0;
size_t disconnSpace = 0;
size_t notentrSpace = 0;
size_t stubSpace = 0;
size_t freeSpace = 0;
size_t maxFreeSize = 0;
HeapBlock* maxFreeBlock = nullptr;
bool insane = false;
unsigned int n_methods = 0;
for (HeapBlock *h = heap->first_block(); h != nullptr && !insane; h = heap->next_block(h)) {
unsigned int hb_len = (unsigned int)h->length(); // despite being size_t, length can never overflow an unsigned int.
size_t hb_bytelen = ((size_t)hb_len)<<log2_seg_size;
unsigned int ix_beg = (unsigned int)(((char*)h-low_bound)/granule_size);
unsigned int ix_end = (unsigned int)(((char*)h-low_bound+(hb_bytelen-1))/granule_size);
int compile_id = 0;
CompLevel comp_lvl = CompLevel_none;
compType cType = noComp;
blobType cbType = noType;
//---< some sanity checks >---
// Do not assert here, just check, print error message and return.
// This is a diagnostic function. It is not supposed to tear down the VM.
if ((char*)h < low_bound) {
insane = true; ast->print_cr("Sanity check: HeapBlock @%p below low bound (%p)", (char*)h, low_bound);
}
if ((char*)h > (low_bound + res_size)) {
insane = true; ast->print_cr("Sanity check: HeapBlock @%p outside reserved range (%p)", (char*)h, low_bound + res_size);
}
if ((char*)h > (low_bound + size)) {
insane = true; ast->print_cr("Sanity check: HeapBlock @%p outside used range (%p)", (char*)h, low_bound + size);
}
if (ix_end >= granules) {
insane = true; ast->print_cr("Sanity check: end index (%d) out of bounds (%zu)", ix_end, granules);
}
if (size != heap->capacity()) {
insane = true; ast->print_cr("Sanity check: code heap capacity has changed (%zuK to %zuK)", size/(size_t)K, heap->capacity()/(size_t)K);
}
if (ix_beg > ix_end) {
insane = true; ast->print_cr("Sanity check: end index (%d) lower than begin index (%d)", ix_end, ix_beg);
}
if (insane) {
BUFFEREDSTREAM_FLUSH("")
continue;
}
if (h->free()) {
nBlocks_free++;
freeSpace += hb_bytelen;
if (hb_bytelen > maxFreeSize) {
maxFreeSize = hb_bytelen;
maxFreeBlock = h;
}
} else {
update_SizeDistArray(out, hb_len);
nBlocks_used++;
usedSpace += hb_bytelen;
CodeBlob* cb = (CodeBlob*)heap->find_start(h);
cbType = get_cbType(cb); // Will check for cb == nullptr and other safety things.
if (cbType != noType) {
const char* blob_name = nullptr;
unsigned int nm_size = 0;
nmethod* nm = cb->as_nmethod_or_null();
if (nm != nullptr) { // no is_readable check required, nm = (nmethod*)cb.
ResourceMark rm;
Method* method = nm->method();
if (nm->is_in_use() || nm->is_not_entrant()) {
blob_name = os::strdup(method->name_and_sig_as_C_string());
} else {
blob_name = os::strdup(cb->name());
}
#if INCLUDE_JVMCI
const char* jvmci_name = nm->jvmci_name();
if (jvmci_name != nullptr) {
size_t size = ::strlen(blob_name) + ::strlen(" jvmci_name=") + ::strlen(jvmci_name) + 1;
char* new_blob_name = (char*)os::malloc(size, mtInternal);
os::snprintf_checked(new_blob_name, size, "%s jvmci_name=%s", blob_name, jvmci_name);
os::free((void*)blob_name);
blob_name = new_blob_name;
}
#endif
nm_size = nm->total_size();
compile_id = nm->compile_id();
comp_lvl = (CompLevel)(nm->comp_level());
if (nm->is_compiled_by_c1()) {
cType = c1;
}
if (nm->is_compiled_by_c2()) {
cType = c2;
}
if (nm->is_compiled_by_jvmci()) {
cType = jvmci;
}
switch (cbType) {
case nMethod_inuse: { // only for executable methods!!!
// space for these cbs is accounted for later.
n_methods++;
break;
}
case nMethod_notused:
nBlocks_alive++;
nBlocks_disconn++;
aliveSpace += hb_bytelen;
disconnSpace += hb_bytelen;
break;
case nMethod_notentrant: // equivalent to nMethod_alive
nBlocks_alive++;
nBlocks_notentr++;
aliveSpace += hb_bytelen;
notentrSpace += hb_bytelen;
break;
default:
break;
}
} else {
blob_name = os::strdup(cb->name());
}
//------------------------------------------
//---< register block in TopSizeArray >---
//------------------------------------------
if (alloc_topSizeBlocks > 0) {
if (used_topSizeBlocks == 0) {
TopSizeArray[0].start = h;
TopSizeArray[0].blob_name = blob_name;
TopSizeArray[0].len = hb_len;
TopSizeArray[0].index = tsbStopper;
TopSizeArray[0].nm_size = nm_size;
TopSizeArray[0].compiler = cType;
TopSizeArray[0].level = comp_lvl;
TopSizeArray[0].type = cbType;
currMax = hb_len;
currMin = hb_len;
currMin_ix = 0;
used_topSizeBlocks++;
blob_name = nullptr; // indicate blob_name was consumed
// This check roughly cuts 5000 iterations (JVM98, mixed, dbg, termination stats):
} else if ((used_topSizeBlocks < alloc_topSizeBlocks) && (hb_len < currMin)) {
//---< all blocks in list are larger, but there is room left in array >---
TopSizeArray[currMin_ix].index = used_topSizeBlocks;
TopSizeArray[used_topSizeBlocks].start = h;
TopSizeArray[used_topSizeBlocks].blob_name = blob_name;
TopSizeArray[used_topSizeBlocks].len = hb_len;
TopSizeArray[used_topSizeBlocks].index = tsbStopper;
TopSizeArray[used_topSizeBlocks].nm_size = nm_size;
TopSizeArray[used_topSizeBlocks].compiler = cType;
TopSizeArray[used_topSizeBlocks].level = comp_lvl;
TopSizeArray[used_topSizeBlocks].type = cbType;
currMin = hb_len;
currMin_ix = used_topSizeBlocks;
used_topSizeBlocks++;
blob_name = nullptr; // indicate blob_name was consumed
} else {
// This check cuts total_iterations by a factor of 6 (JVM98, mixed, dbg, termination stats):
// We don't need to search the list if we know beforehand that the current block size is
// smaller than the currently recorded minimum and there is no free entry left in the list.
if (!((used_topSizeBlocks == alloc_topSizeBlocks) && (hb_len <= currMin))) {
if (currMax < hb_len) {
currMax = hb_len;
}
unsigned int i;
unsigned int prev_i = tsbStopper;
unsigned int limit_i = 0;
for (i = 0; i != tsbStopper; i = TopSizeArray[i].index) {
if (limit_i++ >= alloc_topSizeBlocks) {
insane = true; break; // emergency exit
}
if (i >= used_topSizeBlocks) {
insane = true; break; // emergency exit
}
total_iterations++;
if (TopSizeArray[i].len < hb_len) {
//---< We want to insert here, element <i> is smaller than the current one >---
if (used_topSizeBlocks < alloc_topSizeBlocks) { // still room for a new entry to insert
// old entry gets moved to the next free element of the array.
// That's necessary to keep the entry for the largest block at index 0.
// This move might cause the current minimum to be moved to another place
if (i == currMin_ix) {
assert(TopSizeArray[i].len == currMin, "sort error");
currMin_ix = used_topSizeBlocks;
}
memcpy((void*)&TopSizeArray[used_topSizeBlocks], (void*)&TopSizeArray[i], sizeof(TopSizeBlk));
TopSizeArray[i].start = h;
TopSizeArray[i].blob_name = blob_name;
TopSizeArray[i].len = hb_len;
TopSizeArray[i].index = used_topSizeBlocks;
TopSizeArray[i].nm_size = nm_size;
TopSizeArray[i].compiler = cType;
TopSizeArray[i].level = comp_lvl;
TopSizeArray[i].type = cbType;
used_topSizeBlocks++;
blob_name = nullptr; // indicate blob_name was consumed
} else { // no room for new entries, current block replaces entry for smallest block
//---< Find last entry (entry for smallest remembered block) >---
// We either want to insert right before the smallest entry, which is when <i>
// indexes the smallest entry. We then just overwrite the smallest entry.
// What's more likely:
// We want to insert somewhere in the list. The smallest entry (@<j>) then falls off the cliff.
// The element at the insert point <i> takes it's slot. The second-smallest entry now becomes smallest.
// Data of the current block is filled in at index <i>.
unsigned int j = i;
unsigned int prev_j = tsbStopper;
unsigned int limit_j = 0;
while (TopSizeArray[j].index != tsbStopper) {
if (limit_j++ >= alloc_topSizeBlocks) {
insane = true; break; // emergency exit
}
if (j >= used_topSizeBlocks) {
insane = true; break; // emergency exit
}
total_iterations++;
prev_j = j;
j = TopSizeArray[j].index;
}
if (!insane) {
if (TopSizeArray[j].blob_name != nullptr) {
os::free((void*)TopSizeArray[j].blob_name);
}
if (prev_j == tsbStopper) {
//---< Above while loop did not iterate, we already are the min entry >---
//---< We have to just replace the smallest entry >---
currMin = hb_len;
currMin_ix = j;
TopSizeArray[j].start = h;
TopSizeArray[j].blob_name = blob_name;
TopSizeArray[j].len = hb_len;
TopSizeArray[j].index = tsbStopper; // already set!!
TopSizeArray[i].nm_size = nm_size;
TopSizeArray[j].compiler = cType;
TopSizeArray[j].level = comp_lvl;
TopSizeArray[j].type = cbType;
} else {
//---< second-smallest entry is now smallest >---
TopSizeArray[prev_j].index = tsbStopper;
currMin = TopSizeArray[prev_j].len;
currMin_ix = prev_j;
//---< previously smallest entry gets overwritten >---
memcpy((void*)&TopSizeArray[j], (void*)&TopSizeArray[i], sizeof(TopSizeBlk));
TopSizeArray[i].start = h;
TopSizeArray[i].blob_name = blob_name;
TopSizeArray[i].len = hb_len;
TopSizeArray[i].index = j;
TopSizeArray[i].nm_size = nm_size;
TopSizeArray[i].compiler = cType;
TopSizeArray[i].level = comp_lvl;
TopSizeArray[i].type = cbType;
}
blob_name = nullptr; // indicate blob_name was consumed
} // insane
}
break;
}
prev_i = i;
}
if (insane) {
// Note: regular analysis could probably continue by resetting "insane" flag.
out->print_cr("Possible loop in TopSizeBlocks list detected. Analysis aborted.");
discard_TopSizeArray(out);
}
}
}
}
if (blob_name != nullptr) {
os::free((void*)blob_name);
blob_name = nullptr;
}
//----------------------------------------------
//---< END register block in TopSizeArray >---
//----------------------------------------------
} else {
nBlocks_zomb++;
}
if (ix_beg == ix_end) {
StatArray[ix_beg].type = cbType;
switch (cbType) {
case nMethod_inuse:
highest_compilation_id = (highest_compilation_id >= compile_id) ? highest_compilation_id : compile_id;
if (comp_lvl < CompLevel_full_optimization) {
nBlocks_t1++;
t1Space += hb_bytelen;
StatArray[ix_beg].t1_count++;
StatArray[ix_beg].t1_space += (unsigned short)hb_len;
StatArray[ix_beg].t1_age = StatArray[ix_beg].t1_age < compile_id ? compile_id : StatArray[ix_beg].t1_age;
} else {
nBlocks_t2++;
t2Space += hb_bytelen;
StatArray[ix_beg].t2_count++;
StatArray[ix_beg].t2_space += (unsigned short)hb_len;
StatArray[ix_beg].t2_age = StatArray[ix_beg].t2_age < compile_id ? compile_id : StatArray[ix_beg].t2_age;
}
StatArray[ix_beg].level = comp_lvl;
StatArray[ix_beg].compiler = cType;
break;
default:
nBlocks_stub++;
stubSpace += hb_bytelen;
StatArray[ix_beg].stub_count++;
StatArray[ix_beg].stub_space += (unsigned short)hb_len;
break;
}
} else {
unsigned int beg_space = (unsigned int)(granule_size - ((char*)h - low_bound - ix_beg*granule_size));
unsigned int end_space = (unsigned int)(hb_bytelen - beg_space - (ix_end-ix_beg-1)*granule_size);
beg_space = beg_space>>log2_seg_size; // store in units of _segment_size
end_space = end_space>>log2_seg_size; // store in units of _segment_size
StatArray[ix_beg].type = cbType;
StatArray[ix_end].type = cbType;
switch (cbType) {
case nMethod_inuse:
highest_compilation_id = (highest_compilation_id >= compile_id) ? highest_compilation_id : compile_id;
if (comp_lvl < CompLevel_full_optimization) {
nBlocks_t1++;
t1Space += hb_bytelen;
StatArray[ix_beg].t1_count++;
StatArray[ix_beg].t1_space += (unsigned short)beg_space;
StatArray[ix_beg].t1_age = StatArray[ix_beg].t1_age < compile_id ? compile_id : StatArray[ix_beg].t1_age;
StatArray[ix_end].t1_count++;
StatArray[ix_end].t1_space += (unsigned short)end_space;
StatArray[ix_end].t1_age = StatArray[ix_end].t1_age < compile_id ? compile_id : StatArray[ix_end].t1_age;
} else {
nBlocks_t2++;
t2Space += hb_bytelen;
StatArray[ix_beg].t2_count++;
StatArray[ix_beg].t2_space += (unsigned short)beg_space;
StatArray[ix_beg].t2_age = StatArray[ix_beg].t2_age < compile_id ? compile_id : StatArray[ix_beg].t2_age;
StatArray[ix_end].t2_count++;
StatArray[ix_end].t2_space += (unsigned short)end_space;
StatArray[ix_end].t2_age = StatArray[ix_end].t2_age < compile_id ? compile_id : StatArray[ix_end].t2_age;
}
StatArray[ix_beg].level = comp_lvl;
StatArray[ix_beg].compiler = cType;
StatArray[ix_end].level = comp_lvl;
StatArray[ix_end].compiler = cType;
break;
default:
nBlocks_stub++;
stubSpace += hb_bytelen;
StatArray[ix_beg].stub_count++;
StatArray[ix_beg].stub_space += (unsigned short)beg_space;
StatArray[ix_end].stub_count++;
StatArray[ix_end].stub_space += (unsigned short)end_space;
break;
}
for (unsigned int ix = ix_beg+1; ix < ix_end; ix++) {
StatArray[ix].type = cbType;
switch (cbType) {
case nMethod_inuse:
if (comp_lvl < CompLevel_full_optimization) {
StatArray[ix].t1_count++;
StatArray[ix].t1_space += (unsigned short)(granule_size>>log2_seg_size);
StatArray[ix].t1_age = StatArray[ix].t1_age < compile_id ? compile_id : StatArray[ix].t1_age;
} else {
StatArray[ix].t2_count++;
StatArray[ix].t2_space += (unsigned short)(granule_size>>log2_seg_size);
StatArray[ix].t2_age = StatArray[ix].t2_age < compile_id ? compile_id : StatArray[ix].t2_age;
}
StatArray[ix].level = comp_lvl;
StatArray[ix].compiler = cType;
break;
default:
StatArray[ix].stub_count++;
StatArray[ix].stub_space += (unsigned short)(granule_size>>log2_seg_size);
break;
}
}
}
}
}
done = true;
if (!insane) {
// There is a risk for this block (because it contains many print statements) to get
// interspersed with print data from other threads. We take this risk intentionally.
// Getting stalled waiting for tty_lock while holding the CodeCache_lock is not desirable.
printBox(ast, '-', "Global CodeHeap statistics for segment ", heapName);
ast->print_cr("freeSpace = %8zuk, nBlocks_free = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", freeSpace/(size_t)K, nBlocks_free, (100.0*freeSpace)/size, (100.0*freeSpace)/res_size);
ast->print_cr("usedSpace = %8zuk, nBlocks_used = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", usedSpace/(size_t)K, nBlocks_used, (100.0*usedSpace)/size, (100.0*usedSpace)/res_size);
ast->print_cr(" Tier1 Space = %8zuk, nBlocks_t1 = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", t1Space/(size_t)K, nBlocks_t1, (100.0*t1Space)/size, (100.0*t1Space)/res_size);
ast->print_cr(" Tier2 Space = %8zuk, nBlocks_t2 = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", t2Space/(size_t)K, nBlocks_t2, (100.0*t2Space)/size, (100.0*t2Space)/res_size);
ast->print_cr(" Alive Space = %8zuk, nBlocks_alive = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", aliveSpace/(size_t)K, nBlocks_alive, (100.0*aliveSpace)/size, (100.0*aliveSpace)/res_size);
ast->print_cr(" disconnected = %8zuk, nBlocks_disconn = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", disconnSpace/(size_t)K, nBlocks_disconn, (100.0*disconnSpace)/size, (100.0*disconnSpace)/res_size);
ast->print_cr(" not entrant = %8zuk, nBlocks_notentr = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", notentrSpace/(size_t)K, nBlocks_notentr, (100.0*notentrSpace)/size, (100.0*notentrSpace)/res_size);
ast->print_cr(" stubSpace = %8zuk, nBlocks_stub = %6d, %10.3f%% of capacity, %10.3f%% of max_capacity", stubSpace/(size_t)K, nBlocks_stub, (100.0*stubSpace)/size, (100.0*stubSpace)/res_size);
ast->print_cr("ZombieBlocks = %8d. These are HeapBlocks which could not be identified as CodeBlobs.", nBlocks_zomb);
ast->cr();
ast->print_cr("Segment start = " INTPTR_FORMAT ", used space = %8zuk", p2i(low_bound), size/K);
ast->print_cr("Segment end (used) = " INTPTR_FORMAT ", remaining space = %8zuk", p2i(low_bound) + size, (res_size - size)/K);
ast->print_cr("Segment end (reserved) = " INTPTR_FORMAT ", reserved space = %8zuk", p2i(low_bound) + res_size, res_size/K);
ast->cr();
ast->print_cr("latest allocated compilation id = %d", latest_compilation_id);
ast->print_cr("highest observed compilation id = %d", highest_compilation_id);
ast->print_cr("Building TopSizeList iterations = %ld", total_iterations);
BUFFEREDSTREAM_FLUSH("\n")
// This loop is intentionally printing directly to "out".
// It should not print anything, anyway.
out->print("Verifying collected data...");
size_t granule_segs = granule_size>>log2_seg_size;
for (unsigned int ix = 0; ix < granules; ix++) {
if (StatArray[ix].t1_count > granule_segs) {
out->print_cr("t1_count[%d] = %d", ix, StatArray[ix].t1_count);
}
if (StatArray[ix].t2_count > granule_segs) {
out->print_cr("t2_count[%d] = %d", ix, StatArray[ix].t2_count);
}
if (StatArray[ix].tx_count > granule_segs) {
out->print_cr("tx_count[%d] = %d", ix, StatArray[ix].tx_count);
}
if (StatArray[ix].stub_count > granule_segs) {
out->print_cr("stub_count[%d] = %d", ix, StatArray[ix].stub_count);
}
if (StatArray[ix].t1_space > granule_segs) {
out->print_cr("t1_space[%d] = %d", ix, StatArray[ix].t1_space);
}
if (StatArray[ix].t2_space > granule_segs) {
out->print_cr("t2_space[%d] = %d", ix, StatArray[ix].t2_space);
}
if (StatArray[ix].tx_space > granule_segs) {
out->print_cr("tx_space[%d] = %d", ix, StatArray[ix].tx_space);
}
if (StatArray[ix].stub_space > granule_segs) {
out->print_cr("stub_space[%d] = %d", ix, StatArray[ix].stub_space);
}
// this cast is awful! I need it because NT/Intel reports a signed/unsigned mismatch.
if ((size_t)(StatArray[ix].t1_count+StatArray[ix].t2_count+StatArray[ix].tx_count+StatArray[ix].stub_count) > granule_segs) {
out->print_cr("t1_count[%d] = %d, t2_count[%d] = %d, tx_count[%d] = %d, stub_count[%d] = %d", ix, StatArray[ix].t1_count, ix, StatArray[ix].t2_count, ix, StatArray[ix].tx_count, ix, StatArray[ix].stub_count);
}
if ((size_t)(StatArray[ix].t1_space+StatArray[ix].t2_space+StatArray[ix].tx_space+StatArray[ix].stub_space) > granule_segs) {
out->print_cr("t1_space[%d] = %d, t2_space[%d] = %d, tx_space[%d] = %d, stub_space[%d] = %d", ix, StatArray[ix].t1_space, ix, StatArray[ix].t2_space, ix, StatArray[ix].tx_space, ix, StatArray[ix].stub_space);
}
}
// This loop is intentionally printing directly to "out".
// It should not print anything, anyway.
if (used_topSizeBlocks > 0) {
unsigned int j = 0;
if (TopSizeArray[0].len != currMax) {
out->print_cr("currMax(%d) differs from TopSizeArray[0].len(%d)", currMax, TopSizeArray[0].len);
}
for (unsigned int i = 0; (TopSizeArray[i].index != tsbStopper) && (j++ < alloc_topSizeBlocks); i = TopSizeArray[i].index) {
if (TopSizeArray[i].len < TopSizeArray[TopSizeArray[i].index].len) {
out->print_cr("sort error at index %d: %d !>= %d", i, TopSizeArray[i].len, TopSizeArray[TopSizeArray[i].index].len);
}
}
if (j >= alloc_topSizeBlocks) {
out->print_cr("Possible loop in TopSizeArray chaining!\n allocBlocks = %d, usedBlocks = %d", alloc_topSizeBlocks, used_topSizeBlocks);
for (unsigned int i = 0; i < alloc_topSizeBlocks; i++) {
out->print_cr(" TopSizeArray[%d].index = %d, len = %d", i, TopSizeArray[i].index, TopSizeArray[i].len);
}
}
}
out->print_cr("...done\n\n");
} else {
// insane heap state detected. Analysis data incomplete. Just throw it away.
discard_StatArray(out);
discard_TopSizeArray(out);
}
}
done = false;
while (!done && (nBlocks_free > 0)) {
printBox(ast, '=', "C O D E H E A P A N A L Y S I S (free blocks) for segment ", heapName);
ast->print_cr(" The aggregate step collects information about all free blocks in CodeHeap.\n"
" Subsequent print functions create their output based on this snapshot.\n");
ast->print_cr(" Free space in %s is distributed over %d free blocks.", heapName, nBlocks_free);
ast->print_cr(" Each free block takes %zu bytes of C heap for statistics data, that is %zuK in total.", sizeof(FreeBlk), (sizeof(FreeBlk)*nBlocks_free)/K);
BUFFEREDSTREAM_FLUSH("\n")
//----------------------------------------
//-- Prepare the FreeArray of FreeBlks --
//----------------------------------------
//---< discard old array if size does not match >---
if (nBlocks_free != alloc_freeBlocks) {
discard_FreeArray(out);
}
prepare_FreeArray(out, nBlocks_free, heapName);
if (FreeArray == nullptr) {
done = true;
continue;
}
//----------------------------------------
//-- Collect all FreeBlks in FreeArray --
//----------------------------------------
unsigned int ix = 0;
FreeBlock* cur = heap->freelist();
while (cur != nullptr) {
if (ix < alloc_freeBlocks) { // don't index out of bounds if _freelist has more blocks than anticipated
FreeArray[ix].start = cur;
FreeArray[ix].len = (unsigned int)(cur->length()<<log2_seg_size);
FreeArray[ix].index = ix;
}
cur = cur->link();
ix++;
}
if (ix != alloc_freeBlocks) {
ast->print_cr("Free block count mismatch. Expected %d free blocks, but found %d.", alloc_freeBlocks, ix);
ast->print_cr("I will update the counter and retry data collection");
BUFFEREDSTREAM_FLUSH("\n")
nBlocks_free = ix;
continue;
}
done = true;
}
if (!done || (nBlocks_free == 0)) {
if (nBlocks_free == 0) {
printBox(ast, '-', "no free blocks found in ", heapName);
} else if (!done) {
ast->print_cr("Free block count mismatch could not be resolved.");
ast->print_cr("Try to run \"aggregate\" function to update counters");
}
BUFFEREDSTREAM_FLUSH("")
//---< discard old array and update global values >---
discard_FreeArray(out);
set_HeapStatGlobals(out, heapName);
return;
}
//---< calculate and fill remaining fields >---
if (FreeArray != nullptr) {
// This loop is intentionally printing directly to "out".
// It should not print anything, anyway.
for (unsigned int ix = 0; ix < alloc_freeBlocks-1; ix++) {
size_t lenSum = 0;
FreeArray[ix].gap = (unsigned int)((address)FreeArray[ix+1].start - ((address)FreeArray[ix].start + FreeArray[ix].len));
for (HeapBlock *h = heap->next_block(FreeArray[ix].start); (h != nullptr) && (h != FreeArray[ix+1].start); h = heap->next_block(h)) {
CodeBlob *cb = (CodeBlob*)(heap->find_start(h));
if ((cb != nullptr) && !cb->is_nmethod()) { // checks equivalent to those in get_cbType()
FreeArray[ix].stubs_in_gap = true;
}
FreeArray[ix].n_gapBlocks++;
lenSum += h->length()<<log2_seg_size;
if (((address)h < ((address)FreeArray[ix].start+FreeArray[ix].len)) || (h >= FreeArray[ix+1].start)) {
out->print_cr("unsorted occupied CodeHeap block found @ %p, gap interval [%p, %p)", h, (address)FreeArray[ix].start+FreeArray[ix].len, FreeArray[ix+1].start);
}
}
if (lenSum != FreeArray[ix].gap) {
out->print_cr("Length mismatch for gap between FreeBlk[%d] and FreeBlk[%d]. Calculated: %d, accumulated: %d.", ix, ix+1, FreeArray[ix].gap, (unsigned int)lenSum);
}
}
}
set_HeapStatGlobals(out, heapName);
printBox(ast, '=', "C O D E H E A P A N A L Y S I S C O M P L E T E for segment ", heapName);
BUFFEREDSTREAM_FLUSH("\n")
}