From 78255ba2cc00f41d96aa2911933764f59f24c958 Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Mon, 10 Sep 2018 13:06:12 -0400 Subject: [PATCH] qht: drop ht argument from qht iterators MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Accessing the HT from an iterator results almost always in a deadlock. Given that only one qht-internal function uses this argument, drop it from the interface. Suggested-by: Alex Bennée Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- accel/tcg/translate-all.c | 6 ++---- include/qemu/qht.h | 5 ++--- tests/test-qht.c | 6 +++--- util/qht.c | 29 +++++++++++++++++++---------- util/qsp.c | 11 +++++------ 5 files changed, 31 insertions(+), 26 deletions(-) diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index 898c3bb3d1..9ffbbc2fbd 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -1282,8 +1282,7 @@ void tb_flush(CPUState *cpu) */ #ifdef CONFIG_USER_ONLY -static void -do_tb_invalidate_check(struct qht *ht, void *p, uint32_t hash, void *userp) +static void do_tb_invalidate_check(void *p, uint32_t hash, void *userp) { TranslationBlock *tb = p; target_ulong addr = *(target_ulong *)userp; @@ -1304,8 +1303,7 @@ static void tb_invalidate_check(target_ulong address) qht_iter(&tb_ctx.htable, do_tb_invalidate_check, &address); } -static void -do_tb_page_check(struct qht *ht, void *p, uint32_t hash, void *userp) +static void do_tb_page_check(void *p, uint32_t hash, void *userp) { TranslationBlock *tb = p; int flags1, flags2; diff --git a/include/qemu/qht.h b/include/qemu/qht.h index 3a9618db69..6484837487 100644 --- a/include/qemu/qht.h +++ b/include/qemu/qht.h @@ -43,9 +43,8 @@ struct qht_stats { }; typedef bool (*qht_lookup_func_t)(const void *obj, const void *userp); -typedef void (*qht_iter_func_t)(struct qht *ht, void *p, uint32_t h, void *up); -typedef bool (*qht_iter_bool_func_t)(struct qht *ht, void *p, uint32_t h, - void *up); +typedef void (*qht_iter_func_t)(void *p, uint32_t h, void *up); +typedef bool (*qht_iter_bool_func_t)(void *p, uint32_t h, void *up); #define QHT_MODE_AUTO_RESIZE 0x1 /* auto-resize when heavily loaded */ #define QHT_MODE_RAW_MUTEXES 0x2 /* bypass the profiler (QSP) */ diff --git a/tests/test-qht.c b/tests/test-qht.c index 1ec039d636..4d23cefab6 100644 --- a/tests/test-qht.c +++ b/tests/test-qht.c @@ -98,7 +98,7 @@ static void check(int a, int b, bool expected) qht_statistics_destroy(&stats); } -static void count_func(struct qht *ht, void *p, uint32_t hash, void *userp) +static void count_func(void *p, uint32_t hash, void *userp) { unsigned int *curr = userp; @@ -122,7 +122,7 @@ static void iter_check(unsigned int count) g_assert_cmpuint(curr, ==, count); } -static void sum_func(struct qht *ht, void *p, uint32_t hash, void *userp) +static void sum_func(void *p, uint32_t hash, void *userp) { uint32_t *sum = userp; uint32_t a = *(uint32_t *)p; @@ -138,7 +138,7 @@ static void iter_sum_check(unsigned int expected) g_assert_cmpuint(sum, ==, expected); } -static bool rm_mod_func(struct qht *ht, void *p, uint32_t hash, void *userp) +static bool rm_mod_func(void *p, uint32_t hash, void *userp) { uint32_t a = *(uint32_t *)p; unsigned int mod = *(unsigned int *)userp; diff --git a/util/qht.c b/util/qht.c index c190e89f5b..50ed7a2102 100644 --- a/util/qht.c +++ b/util/qht.c @@ -746,7 +746,7 @@ bool qht_remove(struct qht *ht, const void *p, uint32_t hash) return ret; } -static inline void qht_bucket_iter(struct qht *ht, struct qht_bucket *head, +static inline void qht_bucket_iter(struct qht_bucket *head, const struct qht_iter *iter, void *userp) { struct qht_bucket *b = head; @@ -759,10 +759,10 @@ static inline void qht_bucket_iter(struct qht *ht, struct qht_bucket *head, } switch (iter->type) { case QHT_ITER_VOID: - iter->f.retvoid(ht, b->pointers[i], b->hashes[i], userp); + iter->f.retvoid(b->pointers[i], b->hashes[i], userp); break; case QHT_ITER_RM: - if (iter->f.retbool(ht, b->pointers[i], b->hashes[i], userp)) { + if (iter->f.retbool(b->pointers[i], b->hashes[i], userp)) { /* replace i with the last valid element in the bucket */ seqlock_write_begin(&head->sequence); qht_bucket_remove_entry(b, i); @@ -782,14 +782,14 @@ static inline void qht_bucket_iter(struct qht *ht, struct qht_bucket *head, } /* call with all of the map's locks held */ -static inline void qht_map_iter__all_locked(struct qht *ht, struct qht_map *map, +static inline void qht_map_iter__all_locked(struct qht_map *map, const struct qht_iter *iter, void *userp) { size_t i; for (i = 0; i < map->n_buckets; i++) { - qht_bucket_iter(ht, &map->buckets[i], iter, userp); + qht_bucket_iter(&map->buckets[i], iter, userp); } } @@ -800,8 +800,7 @@ do_qht_iter(struct qht *ht, const struct qht_iter *iter, void *userp) map = atomic_rcu_read(&ht->map); qht_map_lock_buckets(map); - /* Note: ht here is merely for carrying ht->mode; ht->map won't be read */ - qht_map_iter__all_locked(ht, map, iter, userp); + qht_map_iter__all_locked(map, iter, userp); qht_map_unlock_buckets(map); } @@ -825,9 +824,16 @@ void qht_iter_remove(struct qht *ht, qht_iter_bool_func_t func, void *userp) do_qht_iter(ht, &iter, userp); } -static void qht_map_copy(struct qht *ht, void *p, uint32_t hash, void *userp) +struct qht_map_copy_data { + struct qht *ht; + struct qht_map *new; +}; + +static void qht_map_copy(void *p, uint32_t hash, void *userp) { - struct qht_map *new = userp; + struct qht_map_copy_data *data = userp; + struct qht *ht = data->ht; + struct qht_map *new = data->new; struct qht_bucket *b = qht_map_to_bucket(new, hash); /* no need to acquire b->lock because no thread has seen this map yet */ @@ -845,6 +851,7 @@ static void qht_do_resize_reset(struct qht *ht, struct qht_map *new, bool reset) .f.retvoid = qht_map_copy, .type = QHT_ITER_VOID, }; + struct qht_map_copy_data data; old = ht->map; qht_map_lock_buckets(old); @@ -859,7 +866,9 @@ static void qht_do_resize_reset(struct qht *ht, struct qht_map *new, bool reset) } g_assert(new->n_buckets != old->n_buckets); - qht_map_iter__all_locked(ht, old, &iter, new); + data.ht = ht; + data.new = new; + qht_map_iter__all_locked(old, &iter, &data); qht_map_debug__all_locked(new); atomic_rcu_set(&ht->map, new); diff --git a/util/qsp.c b/util/qsp.c index b0c2575d10..2de3a97594 100644 --- a/util/qsp.c +++ b/util/qsp.c @@ -533,7 +533,7 @@ static gint qsp_tree_cmp(gconstpointer ap, gconstpointer bp, gpointer up) } } -static void qsp_sort(struct qht *ht, void *p, uint32_t h, void *userp) +static void qsp_sort(void *p, uint32_t h, void *userp) { QSPEntry *e = p; GTree *tree = userp; @@ -541,7 +541,7 @@ static void qsp_sort(struct qht *ht, void *p, uint32_t h, void *userp) g_tree_insert(tree, e, NULL); } -static void qsp_aggregate(struct qht *global_ht, void *p, uint32_t h, void *up) +static void qsp_aggregate(void *p, uint32_t h, void *up) { struct qht *ht = up; const QSPEntry *e = p; @@ -553,7 +553,7 @@ static void qsp_aggregate(struct qht *global_ht, void *p, uint32_t h, void *up) qsp_entry_aggregate(agg, e); } -static void qsp_iter_diff(struct qht *orig, void *p, uint32_t hash, void *htp) +static void qsp_iter_diff(void *p, uint32_t hash, void *htp) { struct qht *ht = htp; QSPEntry *old = p; @@ -583,8 +583,7 @@ static void qsp_diff(struct qht *orig, struct qht *new) qht_iter(orig, qsp_iter_diff, new); } -static void -qsp_iter_callsite_coalesce(struct qht *orig, void *p, uint32_t h, void *htp) +static void qsp_iter_callsite_coalesce(void *p, uint32_t h, void *htp) { struct qht *ht = htp; QSPEntry *old = p; @@ -603,7 +602,7 @@ qsp_iter_callsite_coalesce(struct qht *orig, void *p, uint32_t h, void *htp) e->n_acqs += old->n_acqs; } -static void qsp_ht_delete(struct qht *ht, void *p, uint32_t h, void *htp) +static void qsp_ht_delete(void *p, uint32_t h, void *htp) { g_free(p); }