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MINOR: pools: replace DEBUG_POOL_TRACING with runtime POOL_DBG_CALLER

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This option used to allow to store a pointer to the caller of the last
pool_alloc() or pool_free() at the end of the area. Now that we can
compute the offsets at runtime, let's check it at run time and continue
the code simplification. In __pool_alloc() we now always calculate the
return address (which is quite cheap), and the POOL_DEBUG_TRACE_CALLER()
calls are conditionned on the status of debugging option.
This commit is contained in:
Willy Tarreau 2022-02-23 10:10:33 +01:00
parent 42705d06b7
commit 0271822f17
3 changed files with 9 additions and 17 deletions
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1
include/haproxy/pool-t.h
View File

@ -47,6 +47,7 @@
#define POOL_DBG_INTEGRITY 0x00000008 // perform integrity checks on cache
#define POOL_DBG_NO_GLOBAL 0x00000010 // disable global pools
#define POOL_DBG_NO_CACHE 0x00000020 // disable thread-local pool caches
#define POOL_DBG_CALLER 0x00000040 // trace last caller's location
/* This is the head of a thread-local cache */

10
include/haproxy/pool.h
View File

@ -90,23 +90,17 @@
* after the end of the area and the optional mark above, which means the
* end of the allocated array.
*/
#if defined(DEBUG_POOL_TRACING)
# define POOL_EXTRA_CALLER (sizeof(void *))
# define POOL_DEBUG_TRACE_CALLER(pool, item, caller) \
do { \
typeof(pool) __p = (pool); \
typeof(item) __i = (item); \
typeof(caller) __c = (caller); \
if (likely(!(pool_debugging & POOL_DBG_CALLER))) \
break; \
*(typeof(caller)*)(((char *)__i) + __p->alloc_sz - sizeof(void*)) = __c; \
} while (0)
#else // DEBUG_POOL_TRACING
# define POOL_EXTRA_CALLER (0)
# define POOL_DEBUG_TRACE_CALLER(pool, item, caller) do { } while (0)
#endif
/* poison each newly allocated area with this byte if >= 0 */
extern int mem_poison_byte;

15
src/pool.c
View File

@ -53,6 +53,9 @@ uint pool_debugging __read_mostly = /* set of POOL_DBG_* flags */
#endif
#ifndef CONFIG_HAP_POOLS
POOL_DBG_NO_CACHE |
#endif
#if defined(DEBUG_POOL_TRACING)
POOL_DBG_CALLER |
#endif
0;
@ -204,7 +207,7 @@ struct pool_head *create_pool(char *name, unsigned int size, unsigned int flags)
*/
extra_mark = POOL_EXTRA_MARK;
extra_caller = POOL_EXTRA_CALLER;
extra_caller = (pool_debugging & POOL_DBG_CALLER) ? POOL_EXTRA_CALLER : 0;
extra = extra_mark + extra_caller;
if (!(flags & MEM_F_EXACT)) {
@ -679,15 +682,12 @@ void pool_gc(struct pool_head *pool_ctx)
void *__pool_alloc(struct pool_head *pool, unsigned int flags)
{
void *p = NULL;
void *caller = NULL;
void *caller = __builtin_return_address(0);
if (unlikely(pool_debugging & POOL_DBG_FAIL_ALLOC))
if (!(flags & POOL_F_NO_FAIL) && mem_should_fail(pool))
return NULL;
#if defined(DEBUG_POOL_TRACING)
caller = __builtin_return_address(0);
#endif
if (likely(!(pool_debugging & POOL_DBG_NO_CACHE)) && !p)
p = pool_get_from_cache(pool, caller);
@ -709,11 +709,8 @@ void *__pool_alloc(struct pool_head *pool, unsigned int flags)
*/
void __pool_free(struct pool_head *pool, void *ptr)
{
const void *caller = NULL;
const void *caller = __builtin_return_address(0);
#if defined(DEBUG_POOL_TRACING)
caller = __builtin_return_address(0);
#endif
/* we'll get late corruption if we refill to the wrong pool or double-free */
POOL_DEBUG_CHECK_MARK(pool, ptr);
POOL_DEBUG_RESET_MARK(pool, ptr);