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Stats: Fix tcache_bytes reporting.

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Previously, large allocations in tcaches would have their sizes reduced during
stats estimation.  Added a test, which fails before this change but passes now.

This fixes a bug introduced in 5934846612, which
was itself fixing a bug introduced in 9c0549007d.
This commit is contained in:
David Goldblatt 2020-03-12 12:42:10 -07:00 committed by David Goldblatt
parent a5780598b3
commit 2e5899c129
2 changed files with 52 additions and 2 deletions
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3
src/arena.c
View File

@ -207,7 +207,8 @@ arena_stats_merge(tsdn_t *tsdn, arena_t *arena, unsigned *nthreads,
cache_bin_t *tbin = &descriptor->bins_large[i];
arena_stats_accum_zu(&astats->tcache_bytes,
cache_bin_ncached_get(tbin,
&tcache_bin_info[i + SC_NBINS]) * sz_index2size(i));
&tcache_bin_info[i + SC_NBINS])
* sz_index2size(i + SC_NBINS));
}
}
malloc_mutex_prof_read(tsdn,

51
test/unit/stats.c
View File

@ -1,5 +1,8 @@
#include "test/jemalloc_test.h"
#define STRINGIFY_HELPER(x) #x
#define STRINGIFY(x) STRINGIFY_HELPER(x)
TEST_BEGIN(test_stats_summary) {
size_t sz, allocated, active, resident, mapped;
int expected = config_stats ? 0 : ENOENT;
@ -361,6 +364,50 @@ TEST_BEGIN(test_stats_arenas_lextents) {
}
TEST_END
static void
test_tcache_bytes_for_usize(size_t usize) {
uint64_t epoch;
size_t tcache_bytes;
size_t sz = sizeof(tcache_bytes);
void *ptr = mallocx(usize, 0);
expect_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
0, "Unexpected mallctl() failure");
assert_d_eq(mallctl(
"stats.arenas." STRINGIFY(MALLCTL_ARENAS_ALL) ".tcache_bytes",
&tcache_bytes, &sz, NULL, 0), 0, "Unexpected mallctl failure");
size_t tcache_bytes_before = tcache_bytes;
dallocx(ptr, 0);
expect_d_eq(mallctl("epoch", NULL, NULL, (void *)&epoch, sizeof(epoch)),
0, "Unexpected mallctl() failure");
assert_d_eq(mallctl(
"stats.arenas." STRINGIFY(MALLCTL_ARENAS_ALL) ".tcache_bytes",
&tcache_bytes, &sz, NULL, 0), 0, "Unexpected mallctl failure");
size_t tcache_bytes_after = tcache_bytes;
assert_zu_eq(tcache_bytes_after - tcache_bytes_before,
usize, "Incorrectly attributed a free");
}
TEST_BEGIN(test_stats_tcache_bytes_small) {
test_skip_if(!config_stats);
test_skip_if(!opt_tcache);
test_skip_if((ZU(1) << opt_lg_tcache_max) < SC_SMALL_MAXCLASS);
test_tcache_bytes_for_usize(SC_SMALL_MAXCLASS);
}
TEST_END
TEST_BEGIN(test_stats_tcache_bytes_large) {
test_skip_if(!config_stats);
test_skip_if(!opt_tcache);
test_skip_if((ZU(1) << opt_lg_tcache_max) < SC_LARGE_MINCLASS);
test_tcache_bytes_for_usize(SC_LARGE_MINCLASS);
}
TEST_END
int
main(void) {
return test_no_reentrancy(
@ -370,5 +417,7 @@ main(void) {
test_stats_arenas_small,
test_stats_arenas_large,
test_stats_arenas_bins,
test_stats_arenas_lextents);
test_stats_arenas_lextents,
test_stats_tcache_bytes_small,
test_stats_tcache_bytes_large);
}