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io_uring: introduce a struct for hash table 

Instead of passing around a pointer to hash buckets, add a bit of type
safety and wrap it into a structure.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d65bc3faba537ec2aca9eabf334394936d44bd28.1655371007.git.asml.silence@gmail.com
Reviewed-by: Hao Xu <howeyxu@tencent.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-16 10:22:10 +01:00 committed by Jens Axboe
parent a2cdd51932
commit e6f89be614
6 changed files with 56 additions and 43 deletions
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6
io_uring/cancel.c
View File

@ -193,12 +193,12 @@ done:
return IOU_OK;
}
void init_hash_table(struct io_hash_bucket *hash_table, unsigned size)
void init_hash_table(struct io_hash_table *table, unsigned size)
{
unsigned int i;
for (i = 0; i < size; i++) {
spin_lock_init(&hash_table[i].lock);
INIT_HLIST_HEAD(&hash_table[i].list);
spin_lock_init(&table->hbs[i].lock);
INIT_HLIST_HEAD(&table->hbs[i].list);
}
}

7
io_uring/cancel.h
View File

@ -4,9 +4,4 @@ int io_async_cancel_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
int io_async_cancel(struct io_kiocb *req, unsigned int issue_flags);
int io_try_cancel(struct io_kiocb *req, struct io_cancel_data *cd);
void init_hash_table(struct io_hash_bucket *hash_table, unsigned size);
struct io_hash_bucket {
spinlock_t lock;
struct hlist_head list;
} ____cacheline_aligned_in_smp;
void init_hash_table(struct io_hash_table *table, unsigned size);

4
io_uring/fdinfo.c
View File

@ -158,8 +158,8 @@ static __cold void __io_uring_show_fdinfo(struct io_ring_ctx *ctx,
mutex_unlock(&ctx->uring_lock);
seq_puts(m, "PollList:\n");
for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
struct io_hash_bucket *hb = &ctx->cancel_hash[i];
for (i = 0; i < (1U << ctx->cancel_table.hash_bits); i++) {
struct io_hash_bucket *hb = &ctx->cancel_table.hbs[i];
struct io_kiocb *req;
spin_lock(&hb->lock);

29
io_uring/io_uring.c
View File

@ -241,11 +241,23 @@ static __cold void io_fallback_req_func(struct work_struct *work)
percpu_ref_put(&ctx->refs);
}
static int io_alloc_hash_table(struct io_hash_table *table, unsigned bits)
{
unsigned hash_buckets = 1U << bits;
size_t hash_size = hash_buckets * sizeof(table->hbs[0]);
table->hbs = kmalloc(hash_size, GFP_KERNEL);
if (!table->hbs)
return -ENOMEM;
table->hash_bits = bits;
init_hash_table(table, hash_buckets);
return 0;
}
static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
{
struct io_ring_ctx *ctx;
unsigned hash_buckets;
size_t hash_size;
int hash_bits;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
@ -261,16 +273,9 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
*/
hash_bits = ilog2(p->cq_entries) - 5;
hash_bits = clamp(hash_bits, 1, 8);
hash_buckets = 1U << hash_bits;
hash_size = hash_buckets * sizeof(struct io_hash_bucket);
ctx->cancel_hash_bits = hash_bits;
ctx->cancel_hash = kmalloc(hash_size, GFP_KERNEL);
if (!ctx->cancel_hash)
if (io_alloc_hash_table(&ctx->cancel_table, hash_bits))
goto err;
init_hash_table(ctx->cancel_hash, hash_buckets);
ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL);
if (!ctx->dummy_ubuf)
goto err;
@ -311,7 +316,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
return ctx;
err:
kfree(ctx->dummy_ubuf);
kfree(ctx->cancel_hash);
kfree(ctx->cancel_table.hbs);
kfree(ctx->io_bl);
xa_destroy(&ctx->io_bl_xa);
kfree(ctx);
@ -2487,7 +2492,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_req_caches_free(ctx);
if (ctx->hash_map)
io_wq_put_hash(ctx->hash_map);
kfree(ctx->cancel_hash);
kfree(ctx->cancel_table.hbs);
kfree(ctx->dummy_ubuf);
kfree(ctx->io_bl);
xa_destroy(&ctx->io_bl_xa);

13
io_uring/io_uring_types.h
View File

@ -9,6 +9,16 @@
#include "io-wq.h"
#include "filetable.h"
struct io_hash_bucket {
spinlock_t lock;
struct hlist_head list;
} ____cacheline_aligned_in_smp;
struct io_hash_table {
struct io_hash_bucket *hbs;
unsigned hash_bits;
};
struct io_uring {
u32 head ____cacheline_aligned_in_smp;
u32 tail ____cacheline_aligned_in_smp;
@ -224,8 +234,7 @@ struct io_ring_ctx {
* manipulate the list, hence no extra locking is needed there.
*/
struct io_wq_work_list iopoll_list;
struct io_hash_bucket *cancel_hash;
unsigned cancel_hash_bits;
struct io_hash_table cancel_table;
bool poll_multi_queue;
struct list_head io_buffers_comp;

40
io_uring/poll.c
View File

@ -73,9 +73,9 @@ static struct io_poll *io_poll_get_single(struct io_kiocb *req)
static void io_poll_req_insert(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
u32 index = hash_long(req->cqe.user_data, ctx->cancel_hash_bits);
struct io_hash_bucket *hb = &ctx->cancel_hash[index];
struct io_hash_table *table = &req->ctx->cancel_table;
u32 index = hash_long(req->cqe.user_data, table->hash_bits);
struct io_hash_bucket *hb = &table->hbs[index];
spin_lock(&hb->lock);
hlist_add_head(&req->hash_node, &hb->list);
@ -84,8 +84,9 @@ static void io_poll_req_insert(struct io_kiocb *req)
static void io_poll_req_delete(struct io_kiocb *req, struct io_ring_ctx *ctx)
{
u32 index = hash_long(req->cqe.user_data, ctx->cancel_hash_bits);
spinlock_t *lock = &ctx->cancel_hash[index].lock;
struct io_hash_table *table = &req->ctx->cancel_table;
u32 index = hash_long(req->cqe.user_data, table->hash_bits);
spinlock_t *lock = &table->hbs[index].lock;
spin_lock(lock);
hash_del(&req->hash_node);
@ -539,13 +540,15 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags)
__cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
bool cancel_all)
{
struct io_hash_table *table = &ctx->cancel_table;
unsigned nr_buckets = 1U << table->hash_bits;
struct hlist_node *tmp;
struct io_kiocb *req;
bool found = false;
int i;
for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
struct io_hash_bucket *hb = &ctx->cancel_hash[i];
for (i = 0; i < nr_buckets; i++) {
struct io_hash_bucket *hb = &table->hbs[i];
spin_lock(&hb->lock);
hlist_for_each_entry_safe(req, tmp, &hb->list, hash_node) {
@ -562,12 +565,12 @@ __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only,
struct io_cancel_data *cd,
struct io_hash_bucket hash_table[],
struct io_hash_table *table,
struct io_hash_bucket **out_bucket)
{
struct io_kiocb *req;
u32 index = hash_long(cd->data, ctx->cancel_hash_bits);
struct io_hash_bucket *hb = &hash_table[index];
u32 index = hash_long(cd->data, table->hash_bits);
struct io_hash_bucket *hb = &table->hbs[index];
*out_bucket = NULL;
@ -591,16 +594,17 @@ static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only,
static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx,
struct io_cancel_data *cd,
struct io_hash_bucket hash_table[],
struct io_hash_table *table,
struct io_hash_bucket **out_bucket)
{
unsigned nr_buckets = 1U << table->hash_bits;
struct io_kiocb *req;
int i;
*out_bucket = NULL;
for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
struct io_hash_bucket *hb = &hash_table[i];
for (i = 0; i < nr_buckets; i++) {
struct io_hash_bucket *hb = &table->hbs[i];
spin_lock(&hb->lock);
hlist_for_each_entry(req, &hb->list, hash_node) {
@ -628,15 +632,15 @@ static bool io_poll_disarm(struct io_kiocb *req)
}
static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
struct io_hash_bucket hash_table[])
struct io_hash_table *table)
{
struct io_hash_bucket *bucket;
struct io_kiocb *req;
if (cd->flags & (IORING_ASYNC_CANCEL_FD|IORING_ASYNC_CANCEL_ANY))
req = io_poll_file_find(ctx, cd, ctx->cancel_hash, &bucket);
req = io_poll_file_find(ctx, cd, table, &bucket);
else
req = io_poll_find(ctx, false, cd, ctx->cancel_hash, &bucket);
req = io_poll_find(ctx, false, cd, table, &bucket);
if (req)
io_poll_cancel_req(req);
@ -647,7 +651,7 @@ static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd)
{
return __io_poll_cancel(ctx, cd, ctx->cancel_hash);
return __io_poll_cancel(ctx, cd, &ctx->cancel_table);
}
static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe,
@ -745,7 +749,7 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
int ret2, ret = 0;
bool locked;
preq = io_poll_find(ctx, true, &cd, ctx->cancel_hash, &bucket);
preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket);
if (preq)
ret2 = io_poll_disarm(preq);
if (bucket)