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io_uring: avoid indirect function calls for the hottest task_work 

We use task_work for a variety of reasons, but doing completions or
triggering rety after poll are by far the hottest two. Use the indirect
funtion call wrappers to avoid the indirect function call if
CONFIG_RETPOLINE is set.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-06-02 08:41:46 -06:00
parent f026be0e1e
commit c92fcfc2ba
5 changed files with 12 additions and 4 deletions
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9
io_uring/io_uring.c
View File

@ -95,6 +95,7 @@
#include "timeout.h"
#include "poll.h"
#include "rw.h"
#include "alloc_cache.h"
#define IORING_MAX_ENTRIES 32768
@ -1205,7 +1206,9 @@ static unsigned int handle_tw_list(struct llist_node *node,
ts->locked = mutex_trylock(&(*ctx)->uring_lock);
percpu_ref_get(&(*ctx)->refs);
}
req->io_task_work.func(req, ts);
INDIRECT_CALL_2(req->io_task_work.func,
io_poll_task_func, io_req_rw_complete,
req, ts);
node = next;
count++;
if (unlikely(need_resched())) {
@ -1415,7 +1418,9 @@ again:
struct io_kiocb *req = container_of(node, struct io_kiocb,
io_task_work.node);
prefetch(container_of(next, struct io_kiocb, io_task_work.node));
req->io_task_work.func(req, ts);
INDIRECT_CALL_2(req->io_task_work.func,
io_poll_task_func, io_req_rw_complete,
req, ts);
ret++;
node = next;
}

2
io_uring/poll.c
View File

@ -326,7 +326,7 @@ static int io_poll_check_events(struct io_kiocb *req, struct io_tw_state *ts)
return IOU_POLL_NO_ACTION;
}
static void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts)
void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts)
{
int ret;

2
io_uring/poll.h
View File

@ -38,3 +38,5 @@ bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
bool cancel_all);
void io_apoll_cache_free(struct io_cache_entry *entry);
void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts);

2
io_uring/rw.c
View File

@ -283,7 +283,7 @@ static inline int io_fixup_rw_res(struct io_kiocb *req, long res)
return res;
}
static void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts)
void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts)
{
io_req_io_end(req);

1
io_uring/rw.h
View File

@ -22,3 +22,4 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags);
int io_writev_prep_async(struct io_kiocb *req);
void io_readv_writev_cleanup(struct io_kiocb *req);
void io_rw_fail(struct io_kiocb *req);
void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts);