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io_uring: move cancel hash tables to kvmalloc/kvfree

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Convert to using kvmalloc/kfree() for the hash tables, and while at it,
make it handle low memory situations better.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-09-30 17:11:32 -06:00
parent 8abf47a8d6
commit b6b3eb19dd
1 changed files with 13 additions and 7 deletions
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20
io_uring/io_uring.c
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@ -261,13 +261,19 @@ static __cold void io_fallback_req_func(struct work_struct *work)
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]);
unsigned int hash_buckets;
int i;
table->hbs = kmalloc(hash_size, GFP_KERNEL);
if (!table->hbs)
return -ENOMEM;
do {
hash_buckets = 1U << bits;
table->hbs = kvmalloc_array(hash_buckets, sizeof(table->hbs[0]),
GFP_KERNEL_ACCOUNT);
if (table->hbs)
break;
if (bits == 1)
return -ENOMEM;
bits--;
} while (1);
table->hash_bits = bits;
for (i = 0; i < hash_buckets; i++)
@ -360,7 +366,7 @@ err:
io_alloc_cache_free(&ctx->uring_cache, kfree);
io_alloc_cache_free(&ctx->msg_cache, io_msg_cache_free);
io_futex_cache_free(ctx);
kfree(ctx->cancel_table.hbs);
kvfree(ctx->cancel_table.hbs);
xa_destroy(&ctx->io_bl_xa);
kfree(ctx);
return NULL;
@ -2772,7 +2778,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
if (ctx->hash_map)
io_wq_put_hash(ctx->hash_map);
io_napi_free(ctx);
kfree(ctx->cancel_table.hbs);
kvfree(ctx->cancel_table.hbs);
xa_destroy(&ctx->io_bl_xa);
kfree(ctx);
}