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bpo-40609: _tracemalloc allocates traces (GH-20064)

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Rewrite _tracemalloc to store "trace_t*" rather than directly
"trace_t" in traces hash tables. Traces are now allocated on the heap
memory, outside the hash table.

Add tracemalloc_copy_traces() and tracemalloc_copy_domains() helper
functions.

Remove _Py_hashtable_copy() function since there is no API to copy a
key or a value.

Remove also _Py_hashtable_delete() function which was commented.
This commit is contained in:
Victor Stinner 2020-05-13 03:52:11 +02:00 committed by GitHub
parent 2d0a3d682f
commit d95bd4214c
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 117 additions and 102 deletions
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10
Include/internal/pycore_hashtable.h
View file

@ -45,13 +45,6 @@ typedef struct {
sizeof(DATA)); \
} while (0)
#define _Py_HASHTABLE_ENTRY_WRITE_DATA(TABLE, ENTRY, DATA) \
do { \
assert(sizeof(DATA) == (TABLE)->data_size); \
memcpy((void *)_Py_HASHTABLE_ENTRY_PDATA(ENTRY), \
&(DATA), sizeof(DATA)); \
} while (0)
/* _Py_hashtable: prototypes */
@ -118,9 +111,6 @@ PyAPI_FUNC(_Py_hashtable_t *) _Py_hashtable_new_full(
PyAPI_FUNC(void) _Py_hashtable_destroy(_Py_hashtable_t *ht);
/* Return a copy of the hash table */
PyAPI_FUNC(_Py_hashtable_t *) _Py_hashtable_copy(_Py_hashtable_t *src);
PyAPI_FUNC(void) _Py_hashtable_clear(_Py_hashtable_t *ht);
typedef int (*_Py_hashtable_foreach_func) (_Py_hashtable_t *ht,

160
Modules/_tracemalloc.c
View file

@ -122,7 +122,7 @@ static traceback_t *tracemalloc_traceback = NULL;
Protected by the GIL */
static _Py_hashtable_t *tracemalloc_tracebacks = NULL;
/* pointer (void*) => trace (trace_t).
/* pointer (void*) => trace (trace_t*).
Protected by TABLES_LOCK(). */
static _Py_hashtable_t *tracemalloc_traces = NULL;
@ -467,13 +467,23 @@ traceback_new(void)
}
static void
tracemalloc_destroy_trace_cb(_Py_hashtable_t *traces,
_Py_hashtable_entry_t *entry)
{
trace_t *trace;
_Py_HASHTABLE_ENTRY_READ_DATA(traces, entry, trace);
raw_free(trace);
}
static _Py_hashtable_t*
tracemalloc_create_traces_table(void)
{
return hashtable_new(sizeof(trace_t),
return hashtable_new(sizeof(trace_t*),
_Py_hashtable_hash_ptr,
_Py_hashtable_compare_direct,
NULL);
tracemalloc_destroy_trace_cb);
}
@ -528,12 +538,13 @@ tracemalloc_remove_trace(unsigned int domain, uintptr_t ptr)
return;
}
trace_t trace;
trace_t *trace;
if (!_Py_HASHTABLE_POP(traces, TO_PTR(ptr), trace)) {
return;
}
assert(tracemalloc_traced_memory >= trace.size);
tracemalloc_traced_memory -= trace.size;
assert(tracemalloc_traced_memory >= trace->size);
tracemalloc_traced_memory -= trace->size;
raw_free(trace);
}
#define REMOVE_TRACE(ptr) \
@ -565,23 +576,27 @@ tracemalloc_add_trace(unsigned int domain, uintptr_t ptr,
}
_Py_hashtable_entry_t* entry = _Py_HASHTABLE_GET_ENTRY(traces, ptr);
trace_t trace;
if (entry != NULL) {
/* the memory block is already tracked */
trace_t *trace;
_Py_HASHTABLE_ENTRY_READ_DATA(traces, entry, trace);
assert(tracemalloc_traced_memory >= trace.size);
tracemalloc_traced_memory -= trace.size;
assert(tracemalloc_traced_memory >= trace->size);
tracemalloc_traced_memory -= trace->size;
trace.size = size;
trace.traceback = traceback;
_Py_HASHTABLE_ENTRY_WRITE_DATA(traces, entry, trace);
trace->size = size;
trace->traceback = traceback;
}
else {
trace.size = size;
trace.traceback = traceback;
trace_t *trace = raw_malloc(sizeof(trace_t));
if (trace == NULL) {
return -1;
}
trace->size = size;
trace->traceback = traceback;
int res = _Py_HASHTABLE_SET(traces, TO_PTR(ptr), trace);
if (res != 0) {
raw_free(trace);
return res;
}
}
@ -1225,19 +1240,62 @@ typedef struct {
unsigned int domain;
} get_traces_t;
static int
tracemalloc_get_traces_copy_domain(_Py_hashtable_t *domains,
_Py_hashtable_entry_t *entry,
void *user_data)
tracemalloc_copy_trace(_Py_hashtable_t *traces,
_Py_hashtable_entry_t *entry,
void *traces2_raw)
{
get_traces_t *get_traces = user_data;
_Py_hashtable_t *traces2 = (_Py_hashtable_t *)traces2_raw;
trace_t *trace;
_Py_HASHTABLE_ENTRY_READ_DATA(traces, entry, trace);
trace_t *trace2 = raw_malloc(sizeof(trace_t));
if (traces2 == NULL) {
return -1;
}
*trace2 = *trace;
if (_Py_HASHTABLE_SET(traces2, entry->key, trace2) < 0) {
raw_free(trace2);
return -1;
}
return 0;
}
static _Py_hashtable_t*
tracemalloc_copy_traces(_Py_hashtable_t *traces)
{
_Py_hashtable_t *traces2 = tracemalloc_create_traces_table();
if (traces2 == NULL) {
return NULL;
}
int err = _Py_hashtable_foreach(traces,
tracemalloc_copy_trace,
traces2);
if (err) {
_Py_hashtable_destroy(traces2);
return NULL;
}
return traces2;
}
static int
tracemalloc_copy_domain(_Py_hashtable_t *domains,
_Py_hashtable_entry_t *entry,
void *domains2_raw)
{
_Py_hashtable_t *domains2 = (_Py_hashtable_t *)domains2_raw;
unsigned int domain = (unsigned int)FROM_PTR(entry->key);
_Py_hashtable_t *traces;
_Py_HASHTABLE_ENTRY_READ_DATA(domains, entry, traces);
_Py_hashtable_t *traces2 = _Py_hashtable_copy(traces);
if (_Py_HASHTABLE_SET(get_traces->domains, TO_PTR(domain), traces2) < 0) {
_Py_hashtable_t *traces2 = tracemalloc_copy_traces(traces);
if (_Py_HASHTABLE_SET(domains2, TO_PTR(domain), traces2) < 0) {
_Py_hashtable_destroy(traces2);
return -1;
}
@ -1245,18 +1303,37 @@ tracemalloc_get_traces_copy_domain(_Py_hashtable_t *domains,
}
static _Py_hashtable_t*
tracemalloc_copy_domains(_Py_hashtable_t *domains)
{
_Py_hashtable_t *domains2 = tracemalloc_create_domains_table();
if (domains2 == NULL) {
return NULL;
}
int err = _Py_hashtable_foreach(domains,
tracemalloc_copy_domain,
domains2);
if (err) {
_Py_hashtable_destroy(domains2);
return NULL;
}
return domains2;
}
static int
tracemalloc_get_traces_fill(_Py_hashtable_t *traces, _Py_hashtable_entry_t *entry,
void *user_data)
{
get_traces_t *get_traces = user_data;
trace_t trace;
trace_t *trace;
PyObject *tracemalloc_obj;
int res;
_Py_HASHTABLE_ENTRY_READ_DATA(traces, entry, trace);
tracemalloc_obj = trace_to_pyobject(get_traces->domain, &trace, get_traces->tracebacks);
tracemalloc_obj = trace_to_pyobject(get_traces->domain, trace, get_traces->tracebacks);
if (tracemalloc_obj == NULL)
return 1;
@ -1335,37 +1412,34 @@ _tracemalloc__get_traces_impl(PyObject *module)
goto no_memory;
}
get_traces.domains = tracemalloc_create_domains_table();
if (get_traces.domains == NULL) {
goto no_memory;
}
int err;
// Copy all traces so tracemalloc_get_traces_fill() doesn't have to disable
// temporarily tracemalloc which would impact other threads and so would
// miss allocations while get_traces() is called.
TABLES_LOCK();
get_traces.traces = _Py_hashtable_copy(tracemalloc_traces);
err = _Py_hashtable_foreach(tracemalloc_domains,
tracemalloc_get_traces_copy_domain,
&get_traces);
get_traces.traces = tracemalloc_copy_traces(tracemalloc_traces);
TABLES_UNLOCK();
if (get_traces.traces == NULL) {
goto no_memory;
}
if (err) {
TABLES_LOCK();
get_traces.domains = tracemalloc_copy_domains(tracemalloc_domains);
TABLES_UNLOCK();
if (get_traces.domains == NULL) {
goto no_memory;
}
// Convert traces to a list of tuples
set_reentrant(1);
err = _Py_hashtable_foreach(get_traces.traces,
tracemalloc_get_traces_fill, &get_traces);
int err = _Py_hashtable_foreach(get_traces.traces,
tracemalloc_get_traces_fill,
&get_traces);
if (!err) {
err = _Py_hashtable_foreach(get_traces.domains,
tracemalloc_get_traces_domain, &get_traces);
tracemalloc_get_traces_domain,
&get_traces);
}
set_reentrant(0);
if (err) {
@ -1398,7 +1472,7 @@ _tracemalloc__get_traces_impl(PyObject *module)
static traceback_t*
tracemalloc_get_traceback(unsigned int domain, uintptr_t ptr)
{
trace_t trace;
trace_t *trace;
int found;
if (!_Py_tracemalloc_config.tracing)
@ -1414,10 +1488,11 @@ tracemalloc_get_traceback(unsigned int domain, uintptr_t ptr)
}
TABLES_UNLOCK();
if (!found)
if (!found) {
return NULL;
}
return trace.traceback;
return trace->traceback;
}
@ -1758,10 +1833,9 @@ _PyTraceMalloc_NewReference(PyObject *op)
/* update the traceback of the memory block */
traceback_t *traceback = traceback_new();
if (traceback != NULL) {
trace_t trace;
trace_t *trace;
_Py_HASHTABLE_ENTRY_READ_DATA(tracemalloc_traces, entry, trace);
trace.traceback = traceback;
_Py_HASHTABLE_ENTRY_WRITE_DATA(tracemalloc_traces, entry, trace);
trace->traceback = traceback;
res = 0;
}
}

49
Python/hashtable.c
View file

@ -350,21 +350,6 @@ _Py_hashtable_pop(_Py_hashtable_t *ht, const void *key,
}
/* Code commented since the function is not needed in Python */
#if 0
void
_Py_hashtable_delete(_Py_hashtable_t *ht, size_t const void *key)
{
#ifndef NDEBUG
int found = _Py_hashtable_pop_entry(ht, key, NULL, 0);
assert(found);
#else
(void)_Py_hashtable_pop_entry(ht, key, NULL, 0);
#endif
}
#endif
int
_Py_hashtable_foreach(_Py_hashtable_t *ht,
_Py_hashtable_foreach_func func,
@ -538,37 +523,3 @@ _Py_hashtable_destroy(_Py_hashtable_t *ht)
ht->alloc.free(ht->buckets);
ht->alloc.free(ht);
}
_Py_hashtable_t *
_Py_hashtable_copy(_Py_hashtable_t *src)
{
const size_t data_size = src->data_size;
_Py_hashtable_t *dst;
_Py_hashtable_entry_t *entry;
size_t bucket;
int err;
dst = _Py_hashtable_new_full(data_size, src->num_buckets,
src->hash_func,
src->compare_func,
src->key_destroy_func,
src->value_destroy_func,
&src->alloc);
if (dst == NULL)
return NULL;
for (bucket=0; bucket < src->num_buckets; bucket++) {
entry = TABLE_HEAD(src, bucket);
for (; entry; entry = ENTRY_NEXT(entry)) {
const void *key = entry->key;
const void *pdata = _Py_HASHTABLE_ENTRY_PDATA(entry);
err = _Py_hashtable_set(dst, key, data_size, pdata);
if (err) {
_Py_hashtable_destroy(dst);
return NULL;
}
}
}
return dst;
}