1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
#include "test/jemalloc_test.h"
/*
* This is a helper utility, only meant to be run manually (and, for example,
* doesn't check for failures, try to skip execution in non-prof modes, etc.).
* It runs, allocates objects of two different sizes from the same stack trace,
* and exits.
*
* The idea is that some human operator will run it like:
* MALLOC_CONF="prof:true,prof_final:true" test/analyze/prof_bias
* and manually inspect the results.
*
* The results should be:
* jeprof --text test/analyze/prof_bias --inuse_space jeprof.<pid>.0.f.heap:
* around 1024 MB
* jeprof --text test/analyze/prof_bias --inuse_objects jeprof.<pid>.0.f.heap:
* around 33554448 = 16 + 32 * 1024 * 1024
*
* And, if prof_accum is on:
* jeprof --text test/analyze/prof_bias --alloc_space jeprof.<pid>.0.f.heap:
* around 2048 MB
* jeprof --text test/analyze/prof_bias --alloc_objects jeprof.<pid>.0.f.heap:
* around 67108896 = 2 * (16 + 32 * 1024 * 1024)
*/
static void
mock_backtrace(void **vec, unsigned *len, unsigned max_len) {
*len = 4;
vec[0] = (void *)0x111;
vec[1] = (void *)0x222;
vec[2] = (void *)0x333;
vec[3] = (void *)0x444;
}
static void
do_allocs(size_t sz, size_t cnt, bool do_frees) {
for (size_t i = 0; i < cnt; i++) {
void *ptr = mallocx(sz, 0);
assert_ptr_not_null(ptr, "Unexpected mallocx failure");
if (do_frees) {
dallocx(ptr, 0);
}
}
}
int
main(void) {
size_t lg_prof_sample_local = 19;
int err = mallctl("prof.reset", NULL, NULL,
(void *)&lg_prof_sample_local, sizeof(lg_prof_sample_local));
assert(err == 0);
prof_backtrace_hook_set(mock_backtrace);
do_allocs(16, 32 * 1024 * 1024, /* do_frees */ true);
do_allocs(32 * 1024* 1024, 16, /* do_frees */ true);
do_allocs(16, 32 * 1024 * 1024, /* do_frees */ false);
do_allocs(32 * 1024* 1024, 16, /* do_frees */ false);
return 0;
}
|
