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Simplify backtracing.

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Simplify backtracing to not ignore any frames, and compensate for this
in pprof in order to increase flexibility with respect to function-based
refactoring even in the presence of non-deterministic inlining.  Modify
pprof to blacklist all jemalloc allocation entry points including
non-standard ones like mallocx(), and ignore all allocator-internal
frames.  Prior to this change, pprof excluded the specifically
blacklisted functions from backtraces, but it left allocator-internal
frames intact.
This commit is contained in:
Jason Evans
2014-04-22 18:41:15 -07:00
parent 05125b8377
commit 6f001059aa
4 changed files with 60 additions and 91 deletions
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7
include/jemalloc/internal/prof.h
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@@ -63,7 +63,6 @@ struct prof_bt_s {
/* Data structure passed to libgcc _Unwind_Backtrace() callback functions. */
typedef struct {
prof_bt_t *bt;
unsigned nignore;
unsigned max;
} prof_unwind_data_t;
#endif
@@ -220,7 +219,7 @@ extern char opt_prof_prefix[
extern uint64_t prof_interval;
void bt_init(prof_bt_t *bt, void **vec);
void prof_backtrace(prof_bt_t *bt, unsigned nignore);
void prof_backtrace(prof_bt_t *bt);
prof_thr_cnt_t *prof_lookup(prof_bt_t *bt);
#ifdef JEMALLOC_JET
size_t prof_bt_count(void);
@@ -244,7 +243,7 @@ void prof_sample_threshold_update(prof_tdata_t *prof_tdata);
/******************************************************************************/
#ifdef JEMALLOC_H_INLINES
#define PROF_ALLOC_PREP(nignore, size, ret) do { \
#define PROF_ALLOC_PREP(size, ret) do { \
prof_tdata_t *prof_tdata; \
prof_bt_t bt; \
\
@@ -255,7 +254,7 @@ void prof_sample_threshold_update(prof_tdata_t *prof_tdata);
ret = (prof_thr_cnt_t *)(uintptr_t)1U; \
} else { \
bt_init(&bt, prof_tdata->vec); \
prof_backtrace(&bt, nignore); \
prof_backtrace(&bt); \
ret = prof_lookup(&bt); \
} \
} while (0)