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Fix psz/pind edge cases.

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Add an "over-size" extent heap in which to store extents which exceed
the maximum size class (plus cache-oblivious padding, if enabled).
Remove psz2ind_clamp() and use psz2ind() instead so that trying to
allocate the maximum size class can in principle succeed.  In practice,
this allows assertions to hold so that OOM errors can be successfully
generated.
This commit is contained in:
Jason Evans 2016-11-03 21:18:50 -07:00
parent 8dd5ea87ca
commit ea9961acdb
7 changed files with 39 additions and 53 deletions
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4
include/jemalloc/internal/arena.h
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@ -212,8 +212,8 @@ struct arena_s {
* Heaps of extents that were previously allocated. These are used when
* allocating extents, in an attempt to re-use address space.
*/
extent_heap_t extents_cached[NPSIZES];
extent_heap_t extents_retained[NPSIZES];
extent_heap_t extents_cached[NPSIZES+1];
extent_heap_t extents_retained[NPSIZES+1];
/*
* Ring sentinel used to track unused dirty memory. Dirty memory is
* managed as an LRU of cached extents.

28
include/jemalloc/internal/jemalloc_internal.h.in
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@ -434,7 +434,7 @@ extern arena_t **arenas;
* pind2sz_tab encodes the same information as could be computed by
* pind2sz_compute().
*/
extern size_t const pind2sz_tab[NPSIZES];
extern size_t const pind2sz_tab[NPSIZES+1];
/*
* index2size_tab encodes the same information as could be computed (at
* unacceptable cost in some code paths) by index2size_compute().
@ -516,9 +516,7 @@ void jemalloc_postfork_child(void);
#include "jemalloc/internal/large.h"
#ifndef JEMALLOC_ENABLE_INLINE
pszind_t psz2ind_impl(size_t psz, bool clamp);
pszind_t psz2ind(size_t psz);
pszind_t psz2ind_clamp(size_t psz);
size_t pind2sz_compute(pszind_t pind);
size_t pind2sz_lookup(pszind_t pind);
size_t pind2sz(pszind_t pind);
@ -544,11 +542,11 @@ ticker_t *decay_ticker_get(tsd_t *tsd, unsigned ind);
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_C_))
JEMALLOC_ALWAYS_INLINE pszind_t
psz2ind_impl(size_t psz, bool clamp)
psz2ind(size_t psz)
{
if (unlikely(psz > LARGE_MAXCLASS))
return (clamp ? NPSIZES-1 : NPSIZES);
return (NPSIZES);
{
pszind_t x = lg_floor((psz<<1)-1);
pszind_t shift = (x < LG_SIZE_CLASS_GROUP + LG_PAGE) ? 0 : x -
@ -567,24 +565,12 @@ psz2ind_impl(size_t psz, bool clamp)
}
}
JEMALLOC_INLINE pszind_t
psz2ind(size_t psz)
{
return (psz2ind_impl(psz, false));
}
JEMALLOC_INLINE pszind_t
psz2ind_clamp(size_t psz)
{
return (psz2ind_impl(psz, true));
}
JEMALLOC_INLINE size_t
pind2sz_compute(pszind_t pind)
{
if (unlikely(pind == NPSIZES))
return (LARGE_MAXCLASS + PAGE);
{
size_t grp = pind >> LG_SIZE_CLASS_GROUP;
size_t mod = pind & ((ZU(1) << LG_SIZE_CLASS_GROUP) - 1);
@ -614,7 +600,7 @@ JEMALLOC_INLINE size_t
pind2sz(pszind_t pind)
{
assert(pind < NPSIZES);
assert(pind < NPSIZES+1);
return (pind2sz_lookup(pind));
}
@ -623,7 +609,7 @@ psz2u(size_t psz)
{
if (unlikely(psz > LARGE_MAXCLASS))
return (0);
return (LARGE_MAXCLASS + PAGE);
{
size_t x = lg_floor((psz<<1)-1);
size_t lg_delta = (x < LG_SIZE_CLASS_GROUP + LG_PAGE + 1) ?

2
include/jemalloc/internal/private_symbols.txt
View File

@ -380,8 +380,6 @@ prof_thread_active_set
prof_thread_name_get
prof_thread_name_set
psz2ind
psz2ind_clamp
psz2ind_impl
psz2u
rtree_child_read
rtree_child_read_hard

2
src/arena.c
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@ -1696,7 +1696,7 @@ arena_new(tsdn_t *tsdn, unsigned ind)
WITNESS_RANK_ARENA_LARGE))
return (NULL);
for (i = 0; i < NPSIZES; i++) {
for (i = 0; i < NPSIZES+1; i++) {
extent_heap_new(&arena->extents_cached[i]);
extent_heap_new(&arena->extents_retained[i]);
}

21
src/extent.c
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@ -45,7 +45,7 @@ static size_t highpages;
*/
static void extent_record(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extent_heap_t extent_heaps[NPSIZES],
extent_hooks_t **r_extent_hooks, extent_heap_t extent_heaps[NPSIZES+1],
bool cache, extent_t *extent);
/******************************************************************************/
@ -190,11 +190,11 @@ extent_ad_comp(const extent_t *a, const extent_t *b)
ph_gen(, extent_heap_, extent_heap_t, extent_t, ph_link, extent_ad_comp)
static void
extent_heaps_insert(tsdn_t *tsdn, extent_heap_t extent_heaps[NPSIZES],
extent_heaps_insert(tsdn_t *tsdn, extent_heap_t extent_heaps[NPSIZES+1],
extent_t *extent)
{
size_t psz = extent_size_quantize_floor(extent_size_get(extent));
pszind_t pind = psz2ind_clamp(psz);
pszind_t pind = psz2ind(psz);
malloc_mutex_assert_owner(tsdn, &extent_arena_get(extent)->extents_mtx);
@ -202,11 +202,11 @@ extent_heaps_insert(tsdn_t *tsdn, extent_heap_t extent_heaps[NPSIZES],
}
static void
extent_heaps_remove(tsdn_t *tsdn, extent_heap_t extent_heaps[NPSIZES],
extent_heaps_remove(tsdn_t *tsdn, extent_heap_t extent_heaps[NPSIZES+1],
extent_t *extent)
{
size_t psz = extent_size_quantize_floor(extent_size_get(extent));
pszind_t pind = psz2ind_clamp(psz);
pszind_t pind = psz2ind(psz);
malloc_mutex_assert_owner(tsdn, &extent_arena_get(extent)->extents_mtx);
@ -358,15 +358,14 @@ extent_deregister(tsdn_t *tsdn, extent_t *extent)
*/
static extent_t *
extent_first_best_fit(tsdn_t *tsdn, arena_t *arena,
extent_heap_t extent_heaps[NPSIZES], size_t size)
extent_heap_t extent_heaps[NPSIZES+1], size_t size)
{
pszind_t pind, i;
malloc_mutex_assert_owner(tsdn, &arena->extents_mtx);
pind = psz2ind(extent_size_quantize_ceil(size));
assert(pind < NPSIZES);
for (i = pind; i < NPSIZES; i++) {
for (i = pind; i < NPSIZES+1; i++) {
extent_t *extent = extent_heap_first(&extent_heaps[i]);
if (extent != NULL)
return (extent);
@ -393,7 +392,7 @@ extent_leak(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
static extent_t *
extent_recycle(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extent_heap_t extent_heaps[NPSIZES], bool locked, bool cache,
extent_heap_t extent_heaps[NPSIZES+1], bool locked, bool cache,
void *new_addr, size_t usize, size_t pad, size_t alignment, bool *zero,
bool *commit, bool slab)
{
@ -758,7 +757,7 @@ extent_can_coalesce(const extent_t *a, const extent_t *b)
static void
extent_try_coalesce(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extent_t *a, extent_t *b,
extent_heap_t extent_heaps[NPSIZES], bool cache)
extent_heap_t extent_heaps[NPSIZES+1], bool cache)
{
if (!extent_can_coalesce(a, b))
@ -786,7 +785,7 @@ extent_try_coalesce(tsdn_t *tsdn, arena_t *arena,
static void
extent_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extent_heap_t extent_heaps[NPSIZES], bool cache, extent_t *extent)
extent_heap_t extent_heaps[NPSIZES+1], bool cache, extent_t *extent)
{
extent_t *prev, *next;
rtree_ctx_t rtree_ctx_fallback;

3
src/jemalloc.c
View File

@ -83,7 +83,7 @@ enum {
static uint8_t malloc_slow_flags;
JEMALLOC_ALIGNED(CACHELINE)
const size_t pind2sz_tab[NPSIZES] = {
const size_t pind2sz_tab[NPSIZES+1] = {
#define PSZ_yes(lg_grp, ndelta, lg_delta) \
(((ZU(1)<<lg_grp) + (ZU(ndelta)<<lg_delta))),
#define PSZ_no(lg_grp, ndelta, lg_delta)
@ -93,6 +93,7 @@ const size_t pind2sz_tab[NPSIZES] = {
#undef PSZ_yes
#undef PSZ_no
#undef SC
(LARGE_MAXCLASS + PAGE)
};
JEMALLOC_ALIGNED(CACHELINE)

32
test/unit/size_classes.c
View File

@ -82,19 +82,18 @@ TEST_END
TEST_BEGIN(test_psize_classes)
{
size_t size_class, max_size_class;
size_t size_class, max_psz;
pszind_t pind, max_pind;
max_size_class = get_max_size_class();
max_pind = psz2ind(max_size_class);
max_psz = get_max_size_class() + PAGE;
max_pind = psz2ind(max_psz);
for (pind = 0, size_class = pind2sz(pind); pind < max_pind ||
size_class < max_size_class; pind++, size_class =
pind2sz(pind)) {
for (pind = 0, size_class = pind2sz(pind); pind < max_pind || size_class
< max_psz; pind++, size_class = pind2sz(pind)) {
assert_true(pind < max_pind,
"Loop conditionals should be equivalent; pind=%u, "
"size_class=%zu (%#zx)", pind, size_class, size_class);
assert_true(size_class < max_size_class,
assert_true(size_class < max_psz,
"Loop conditionals should be equivalent; pind=%u, "
"size_class=%zu (%#zx)", pind, size_class, size_class);
@ -125,7 +124,7 @@ TEST_BEGIN(test_psize_classes)
assert_u_eq(pind, psz2ind(pind2sz(pind)),
"psz2ind() does not reverse pind2sz()");
assert_zu_eq(max_size_class, pind2sz(psz2ind(max_size_class)),
assert_zu_eq(max_psz, pind2sz(psz2ind(max_psz)),
"pind2sz() does not reverse psz2ind()");
assert_zu_eq(size_class, psz2u(pind2sz(pind-1)+1),
@ -139,9 +138,10 @@ TEST_END
TEST_BEGIN(test_overflow)
{
size_t max_size_class;
size_t max_size_class, max_psz;
max_size_class = get_max_size_class();
max_psz = max_size_class + PAGE;
assert_u_eq(size2index(max_size_class+1), NSIZES,
"size2index() should return NSIZES on overflow");
@ -164,12 +164,14 @@ TEST_BEGIN(test_overflow)
assert_u_eq(psz2ind(SIZE_T_MAX), NPSIZES,
"psz2ind() should return NPSIZES on overflow");
assert_zu_eq(psz2u(max_size_class+1), 0,
"psz2u() should return 0 for unsupported size");
assert_zu_eq(psz2u(ZU(PTRDIFF_MAX)+1), 0,
"psz2u() should return 0 for unsupported size");
assert_zu_eq(psz2u(SIZE_T_MAX), 0,
"psz2u() should return 0 on overflow");
assert_zu_eq(psz2u(max_size_class+1), max_psz,
"psz2u() should return (LARGE_MAXCLASS + PAGE) for unsupported"
" size");
assert_zu_eq(psz2u(ZU(PTRDIFF_MAX)+1), max_psz,
"psz2u() should return (LARGE_MAXCLASS + PAGE) for unsupported "
"size");
assert_zu_eq(psz2u(SIZE_T_MAX), max_psz,
"psz2u() should return (LARGE_MAXCLASS + PAGE) on overflow");
}
TEST_END