project-base/server-skynet-source-3rd-jemalloc
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prof_backtrace: use unw_backtrace

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unw_backtrace:
- does internal per-thread caching
- doesn't acquire an internal lock
This commit is contained in:
Lucian Adrian Grijincu 2014-04-21 20:52:35 -07:00
parent 3541a904d6
commit 9d4e13f45a
2 changed files with 11 additions and 26 deletions
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4
include/jemalloc/internal/jemalloc_internal.h.in
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@ -352,9 +352,9 @@ static const bool config_ivsalloc =
# endif # endif
# endif # endif
# define VARIABLE_ARRAY(type, name, count) \ # define VARIABLE_ARRAY(type, name, count) \
type *name = alloca(sizeof(type) * count) type *name = alloca(sizeof(type) * (count))
#else #else
# define VARIABLE_ARRAY(type, name, count) type name[count] # define VARIABLE_ARRAY(type, name, count) type name[(count)]
#endif #endif
#include "jemalloc/internal/valgrind.h" #include "jemalloc/internal/valgrind.h"

33
src/prof.c
View File

@ -160,36 +160,21 @@ prof_leave(prof_tdata_t *prof_tdata)
void void
prof_backtrace(prof_bt_t *bt, unsigned nignore) prof_backtrace(prof_bt_t *bt, unsigned nignore)
{ {
unw_context_t uc;
unw_cursor_t cursor;
unsigned i;
int err;
cassert(config_prof); cassert(config_prof);
assert(bt->len == 0); assert(bt->len == 0);
assert(bt->vec != NULL); assert(bt->vec != NULL);
unw_getcontext(&uc); VARIABLE_ARRAY(void *, frames, nignore + PROF_BT_MAX);
unw_init_local(&cursor, &uc); int n = unw_backtrace(frames, nignore + PROF_BT_MAX);
if (n <= 0)
return;
/* Throw away (nignore+1) stack frames, if that many exist. */ /* Throw away (nignore+1) stack frames, if that many exist. */
for (i = 0; i < nignore + 1; i++) { nignore++;
err = unw_step(&cursor); if (nignore >= n)
if (err <= 0) return;
return; memcpy(bt->vec, &frames[nignore], sizeof(frames[0]) * (n - nignore));
} bt->len = n - nignore;
/*
* Iterate over stack frames until there are no more, or until no space
* remains in bt.
*/
for (i = 0; i < PROF_BT_MAX; i++) {
unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *)&bt->vec[i]);
bt->len++;
err = unw_step(&cursor);
if (err <= 0)
break;
}
} }
#elif (defined(JEMALLOC_PROF_LIBGCC)) #elif (defined(JEMALLOC_PROF_LIBGCC))
static _Unwind_Reason_Code static _Unwind_Reason_Code