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io_uring: use tw for putting rsrc

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Use task_work for completing rsrc removals, it'll be needed later for
spinlock optimisations.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/cbba5d53a11ee6fc2194dacea262c1d733c8b529.1670384893.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-12-07 03:53:32 +00:00 committed by Jens Axboe
parent 17add5cea2
commit d34b1b0b67
4 changed files with 20 additions and 2 deletions
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1
include/linux/io_uring_types.h
View File

@ -328,6 +328,7 @@ struct io_ring_ctx {
struct io_rsrc_data *buf_data;
struct delayed_work rsrc_put_work;
struct callback_head rsrc_put_tw;
struct llist_head rsrc_put_llist;
struct list_head rsrc_ref_list;
spinlock_t rsrc_ref_lock;

1
io_uring/io_uring.c
View File

@ -326,6 +326,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
spin_lock_init(&ctx->rsrc_ref_lock);
INIT_LIST_HEAD(&ctx->rsrc_ref_list);
INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work);
init_task_work(&ctx->rsrc_put_tw, io_rsrc_put_tw);
init_llist_head(&ctx->rsrc_put_llist);
init_llist_head(&ctx->work_llist);
INIT_LIST_HEAD(&ctx->tctx_list);

19
io_uring/rsrc.c
View File

@ -204,6 +204,14 @@ void io_rsrc_put_work(struct work_struct *work)
}
}
void io_rsrc_put_tw(struct callback_head *cb)
{
struct io_ring_ctx *ctx = container_of(cb, struct io_ring_ctx,
rsrc_put_tw);
io_rsrc_put_work(&ctx->rsrc_put_work.work);
}
void io_wait_rsrc_data(struct io_rsrc_data *data)
{
if (data && !atomic_dec_and_test(&data->refs))
@ -242,8 +250,15 @@ static __cold void io_rsrc_node_ref_zero(struct percpu_ref *ref)
}
spin_unlock_irqrestore(&ctx->rsrc_ref_lock, flags);
if (first_add)
mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay);
if (!first_add)
return;
if (ctx->submitter_task) {
if (!task_work_add(ctx->submitter_task, &ctx->rsrc_put_tw,
ctx->notify_method))
return;
}
mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay);
}
static struct io_rsrc_node *io_rsrc_node_alloc(void)

1
io_uring/rsrc.h
View File

@ -53,6 +53,7 @@ struct io_mapped_ubuf {
struct bio_vec bvec[];
};
void io_rsrc_put_tw(struct callback_head *cb);
void io_rsrc_put_work(struct work_struct *work);
void io_rsrc_refs_refill(struct io_ring_ctx *ctx);
void io_wait_rsrc_data(struct io_rsrc_data *data);