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io_uring: name sq thread and ref completions

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We used to have three completions, now we just have two. With the two,
let's not allocate them dynamically, just embed then in the ctx and
name them appropriately.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-05-14 17:18:39 -06:00
parent 8469508951
commit 0f158b4cf2
1 changed files with 10 additions and 16 deletions
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26
fs/io_uring.c
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@ -279,8 +279,8 @@ struct io_ring_ctx {
const struct cred *creds;
/* 0 is for ctx quiesce/reinit/free, 1 is for sqo_thread started */
struct completion *completions;
struct completion ref_comp;
struct completion sq_thread_comp;
/* if all else fails... */
struct io_kiocb *fallback_req;
@ -883,7 +883,7 @@ static void io_ring_ctx_ref_free(struct percpu_ref *ref)
{
struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
complete(&ctx->completions[0]);
complete(&ctx->ref_comp);
}
static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
@ -899,10 +899,6 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
if (!ctx->fallback_req)
goto err;
ctx->completions = kmalloc(2 * sizeof(struct completion), GFP_KERNEL);
if (!ctx->completions)
goto err;
/*
* Use 5 bits less than the max cq entries, that should give us around
* 32 entries per hash list if totally full and uniformly spread.
@ -925,8 +921,8 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
ctx->flags = p->flags;
init_waitqueue_head(&ctx->cq_wait);
INIT_LIST_HEAD(&ctx->cq_overflow_list);
init_completion(&ctx->completions[0]);
init_completion(&ctx->completions[1]);
init_completion(&ctx->ref_comp);
init_completion(&ctx->sq_thread_comp);
idr_init(&ctx->io_buffer_idr);
idr_init(&ctx->personality_idr);
mutex_init(&ctx->uring_lock);
@ -942,7 +938,6 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
err:
if (ctx->fallback_req)
kmem_cache_free(req_cachep, ctx->fallback_req);
kfree(ctx->completions);
kfree(ctx->cancel_hash);
kfree(ctx);
return NULL;
@ -5933,7 +5928,7 @@ static int io_sq_thread(void *data)
unsigned long timeout;
int ret = 0;
complete(&ctx->completions[1]);
complete(&ctx->sq_thread_comp);
old_fs = get_fs();
set_fs(USER_DS);
@ -6212,7 +6207,7 @@ static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
static void io_sq_thread_stop(struct io_ring_ctx *ctx)
{
if (ctx->sqo_thread) {
wait_for_completion(&ctx->completions[1]);
wait_for_completion(&ctx->sq_thread_comp);
/*
* The park is a bit of a work-around, without it we get
* warning spews on shutdown with SQPOLL set and affinity
@ -7241,7 +7236,6 @@ static void io_ring_ctx_free(struct io_ring_ctx *ctx)
ring_pages(ctx->sq_entries, ctx->cq_entries));
free_uid(ctx->user);
put_cred(ctx->creds);
kfree(ctx->completions);
kfree(ctx->cancel_hash);
kmem_cache_free(req_cachep, ctx->fallback_req);
kfree(ctx);
@ -7293,7 +7287,7 @@ static void io_ring_exit_work(struct work_struct *work)
if (ctx->rings)
io_cqring_overflow_flush(ctx, true);
wait_for_completion(&ctx->completions[0]);
wait_for_completion(&ctx->ref_comp);
io_ring_ctx_free(ctx);
}
@ -7992,7 +7986,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
* after we've killed the percpu ref.
*/
mutex_unlock(&ctx->uring_lock);
ret = wait_for_completion_interruptible(&ctx->completions[0]);
ret = wait_for_completion_interruptible(&ctx->ref_comp);
mutex_lock(&ctx->uring_lock);
if (ret) {
percpu_ref_resurrect(&ctx->refs);
@ -8069,7 +8063,7 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
/* bring the ctx back to life */
percpu_ref_reinit(&ctx->refs);
out:
reinit_completion(&ctx->completions[0]);
reinit_completion(&ctx->ref_comp);
}
return ret;
}