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io_uring: improve io_fail_links() 

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2068237

commit 37c7bd31b3e9e4b6aee3c5227f789c0b586a33a2
Author: Pavel Begunkov <asml.silence@gmail.com>
Date:   Sat Jun 25 11:52:58 2022 +0100

    io_uring: improve io_fail_links()
    
    io_fail_links() is called with ->completion_lock held and for that
    reason we'd want to keep it as small as we can. Instead of doing
    __io_req_complete_post() for each linked request under the lock, fail
    them in a task_work handler under ->uring_lock.
    
    Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
    Link: https://lore.kernel.org/r/a2f68708b970a21f4e84ddfa7b3abd67a8fffb27.1656153285.git.asml.silence@gmail.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
This commit is contained in:
Jeff Moyer 2022-06-25 11:52:58 +01:00
parent 73023a4a75
commit 4101d0b1f2
1 changed files with 24 additions and 12 deletions
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36
io_uring/timeout.c
View File

@ -101,32 +101,44 @@ __cold void io_flush_timeouts(struct io_ring_ctx *ctx)
spin_unlock_irq(&ctx->timeout_lock);
}
static void io_fail_links(struct io_kiocb *req)
__must_hold(&req->ctx->completion_lock)
static void io_req_tw_fail_links(struct io_kiocb *link, bool *locked)
{
struct io_kiocb *nxt, *link = req->link;
bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES;
req->link = NULL;
io_tw_lock(link->ctx, locked);
while (link) {
struct io_kiocb *nxt = link->link;
long res = -ECANCELED;
if (link->flags & REQ_F_FAIL)
res = link->cqe.res;
nxt = link->link;
link->link = NULL;
io_req_set_res(link, res, 0);
io_req_task_complete(link, locked);
link = nxt;
}
}
trace_io_uring_fail_link(req, link);
static void io_fail_links(struct io_kiocb *req)
__must_hold(&req->ctx->completion_lock)
{
struct io_kiocb *link = req->link;
bool ignore_cqes = req->flags & REQ_F_SKIP_LINK_CQES;
if (!link)
return;
while (link) {
if (ignore_cqes)
link->flags |= REQ_F_CQE_SKIP;
else
link->flags &= ~REQ_F_CQE_SKIP;
io_req_set_res(link, res, 0);
__io_req_complete_post(link);
link = nxt;
trace_io_uring_fail_link(req, link);
link = link->link;
}
link = req->link;
link->io_task_work.func = io_req_tw_fail_links;
io_req_task_work_add(link);
req->link = NULL;
}
static inline void io_remove_next_linked(struct io_kiocb *req)