ad47e8996e
Break prof_accum into multiple compilation units, in order to thwart compiler optimizations such as inlining and tail call optimization that would alter backtraces.
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
#include "prof_accum.h"
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#ifdef JEMALLOC_PROF
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const char *malloc_conf =
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"prof:true,prof_accum:true,prof_active:false,lg_prof_sample:0";
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#endif
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static int
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prof_dump_open_intercept(bool propagate_err, const char *filename)
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{
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int fd;
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fd = open("/dev/null", O_WRONLY);
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assert_d_ne(fd, -1, "Unexpected open() failure");
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return (fd);
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}
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static void *
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alloc_from_permuted_backtrace(unsigned thd_ind, unsigned iteration)
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{
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return (alloc_0(thd_ind*NALLOCS_PER_THREAD + iteration));
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}
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static void *
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thd_start(void *varg)
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{
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unsigned thd_ind = *(unsigned *)varg;
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size_t bt_count_prev, bt_count;
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unsigned i_prev, i;
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i_prev = 0;
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bt_count_prev = 0;
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for (i = 0; i < NALLOCS_PER_THREAD; i++) {
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void *p = alloc_from_permuted_backtrace(thd_ind, i);
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dallocx(p, 0);
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if (i % DUMP_INTERVAL == 0) {
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assert_d_eq(mallctl("prof.dump", NULL, NULL, NULL, 0),
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0, "Unexpected error while dumping heap profile");
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}
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if (i % BT_COUNT_CHECK_INTERVAL == 0 ||
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i+1 == NALLOCS_PER_THREAD) {
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bt_count = prof_bt_count();
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assert_zu_le(bt_count_prev+(i-i_prev), bt_count,
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"Expected larger backtrace count increase");
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i_prev = i;
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bt_count_prev = bt_count;
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}
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}
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return (NULL);
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}
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TEST_BEGIN(test_idump)
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{
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bool active;
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thd_t thds[NTHREADS];
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unsigned thd_args[NTHREADS];
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unsigned i;
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test_skip_if(!config_prof);
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active = true;
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assert_d_eq(mallctl("prof.active", NULL, NULL, &active, sizeof(active)),
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0, "Unexpected mallctl failure while activating profiling");
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prof_dump_open = prof_dump_open_intercept;
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for (i = 0; i < NTHREADS; i++) {
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thd_args[i] = i;
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thd_create(&thds[i], thd_start, (void *)&thd_args[i]);
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}
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for (i = 0; i < NTHREADS; i++)
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thd_join(thds[i], NULL);
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}
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TEST_END
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int
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main(void)
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{
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return (test(
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test_idump));
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}
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