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io_uring: don't reinit submit state every time 

As now submit_state is retained across syscalls, we can save ourself
from initialising it from ground up for each io_submit_sqes(). Set some
fields during ctx allocation, and just keep them always consistent.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
[axboe: remove unnecessary zeroing of ctx members]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-10 00:03:12 +00:00 committed by Jens Axboe
parent ba88ff112b
commit 5087275dba
1 changed files with 4 additions and 5 deletions
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9
fs/io_uring.c
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@ -1345,6 +1345,7 @@ static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
INIT_LIST_HEAD(&ctx->rsrc_ref_list);
INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work);
init_llist_head(&ctx->rsrc_put_llist);
INIT_LIST_HEAD(&submit_state->comp.list);
return ctx;
err:
if (ctx->fallback_req)
@ -6661,8 +6662,10 @@ static void io_submit_state_end(struct io_submit_state *state,
if (state->plug_started)
blk_finish_plug(&state->plug);
io_state_file_put(state);
if (state->free_reqs)
if (state->free_reqs) {
kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);
state->free_reqs = 0;
}
}
/*
@ -6672,10 +6675,6 @@ static void io_submit_state_start(struct io_submit_state *state,
unsigned int max_ios)
{
state->plug_started = false;
state->comp.nr = 0;
INIT_LIST_HEAD(&state->comp.list);
state->free_reqs = 0;
state->file_refs = 0;
state->ios_left = max_ios;
}