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[66.29.188.166]) by smtp.gmail.com with ESMTPSA id m20sm5317804pgv.93.2019.01.18.08.12.54 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 18 Jan 2019 08:12:55 -0800 (PST) From: Jens Axboe To: linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, linux-block@vger.kernel.org Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com, Jens Axboe Subject: [PATCH 10/17] io_uring: batch io_kiocb allocation Date: Fri, 18 Jan 2019 09:12:18 -0700 Message-Id: <20190118161225.4545-11-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190118161225.4545-1-axboe@kernel.dk> References: <20190118161225.4545-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Similarly to how we use the state->ios_left to know how many references to get to a file, we can use it to allocate the io_kiocb's we need in bulk. Signed-off-by: Jens Axboe --- fs/io_uring.c | 39 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 36 insertions(+), 3 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 668043c87ddb..666f4cee1a5b 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -135,6 +135,13 @@ struct io_kiocb { struct io_submit_state { struct blk_plug plug; + /* + * io_kiocb alloc cache + */ + void *reqs[IO_IOPOLL_BATCH]; + unsigned int free_reqs; + unsigned int cur_req; + /* * File reference cache */ @@ -258,20 +265,42 @@ static void io_ring_drop_ctx_refs(struct io_ring_ctx *ctx, unsigned refs) wake_up(&ctx->wait); } -static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx) +static struct io_kiocb *io_get_req(struct io_ring_ctx *ctx, + struct io_submit_state *state) { + gfp_t gfp = GFP_ATOMIC | __GFP_NOWARN; struct io_kiocb *req; /* safe to use the non tryget, as we're inside ring ref already */ percpu_ref_get(&ctx->refs); - req = kmem_cache_alloc(req_cachep, GFP_ATOMIC | __GFP_NOWARN); + if (!state) + req = kmem_cache_alloc(req_cachep, gfp); + else if (!state->free_reqs) { + size_t sz; + int ret; + + sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs)); + ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, + state->reqs); + if (ret <= 0) + goto out; + state->free_reqs = ret - 1; + state->cur_req = 1; + req = state->reqs[0]; + } else { + req = state->reqs[state->cur_req]; + state->free_reqs--; + state->cur_req++; + } + if (req) { req->ctx = ctx; req->flags = 0; return req; } +out: io_ring_drop_ctx_refs(ctx, 1); return NULL; } @@ -881,7 +910,7 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct sqe_submit *s, if (unlikely(s->sqe->flags)) return -EINVAL; - req = io_get_req(ctx); + req = io_get_req(ctx, state); if (unlikely(!req)) return -EAGAIN; @@ -905,6 +934,9 @@ static void io_submit_state_end(struct io_submit_state *state) { blk_finish_plug(&state->plug); io_file_put(state, NULL); + if (state->free_reqs) + kmem_cache_free_bulk(req_cachep, state->free_reqs, + &state->reqs[state->cur_req]); } /* @@ -914,6 +946,7 @@ static void io_submit_state_start(struct io_submit_state *state, struct io_ring_ctx *ctx, unsigned max_ios) { blk_start_plug(&state->plug); + state->free_reqs = 0; state->file = NULL; state->ios_left = max_ios; }