From patchwork Tue Jul 5 15:01:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12906701 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3AA8BC43334 for ; Tue, 5 Jul 2022 15:03:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229702AbiGEPDA (ORCPT ); Tue, 5 Jul 2022 11:03:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230248AbiGEPC1 (ORCPT ); Tue, 5 Jul 2022 11:02:27 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0291717040; Tue, 5 Jul 2022 08:02:05 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id q9so17961048wrd.8; Tue, 05 Jul 2022 08:02:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=lC2y6heFTIszSDWCfIFDneSWEpHJYiSq2WiQM7wzmnY=; b=MOKOANxSOtxlirWG/N/isvmy1VIyEsi6v+0KsJ485FSPbos+8nR+AMs6DF4MCANC9m dL0jTsXbvKsmSmGYO8hzKRQB0nuNaJtigagAKnk4pzyNdAhkjC+U8rhf7J020AfI9lEf F2WgSCtoADxMkgIxq1+Ru+gVxk31XQv71+Fde3TMTnY7XnWEvj8zZBAPWlWZTYBQG+3V oHDXGwjQwZwZZByb15gKsF3pCRst7DpCM3dZDhsWX1cz8KFI/3UtcRikvI5khV6N8HJM 96D09dDvqCDx9du+PRp5Y6PXdf//OPGFa3tBmACDAnUMXAIWdPPHNB+dTEpqZah3cgn+ ng5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lC2y6heFTIszSDWCfIFDneSWEpHJYiSq2WiQM7wzmnY=; b=XkcZfT6IFnnZj6l/J5eMJZew8wUkRT/rh5r+5AiQsiQAWrMr2Gm/BB13Fbm4Pp5md7 w9Swwp6Y0KyvS3d1EQuuKDAfSOCp1NzdAUtWcduk/aQ2AzJFU38tEzah0hSbZBNEnlZs 0MoexHDMyf2oIMYc6gS+XVXIygvzKuNh/nzmzB6AYJuYDI9kivEnbXH7dvld99d5PQgU dbR9QcHmZVNiH0HyXW1my1xtFfN0tX/j4PxxveDWtWCPqbmNYW536/tyuVB3aBHgXKB8 VI4tOOzC784NDhe9NUdGfnLROkjJJLofWd9/Og8sMu2Loj5/AwRN+mH8vp4Fzecwoc0Z SCbQ== X-Gm-Message-State: AJIora90r0Weh82/dtDzr1TLmTG5k/0MFsjClCyUgnzCuHvIjy2gVSxX UTFzmdypzacSFNIyipGdVCVXO259CiC20A== X-Google-Smtp-Source: AGRyM1vyk37aZ7jDxeoKqJj6qXwBETKD394Mw4M6fvlkmPOliQJkUNnpHAGJPczwkK/+eX9AlSdNbA== X-Received: by 2002:a5d:58cc:0:b0:21d:6919:7daf with SMTP id o12-20020a5d58cc000000b0021d69197dafmr12176606wrf.434.1657033324881; Tue, 05 Jul 2022 08:02:04 -0700 (PDT) Received: from 127.0.0.1localhost (188.28.125.106.threembb.co.uk. [188.28.125.106]) by smtp.gmail.com with ESMTPSA id k27-20020adfd23b000000b0021d728d687asm2518200wrh.36.2022.07.05.08.02.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Jul 2022 08:02:04 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: "David S . Miller" , Jakub Kicinski , Jonathan Lemon , Willem de Bruijn , Jens Axboe , David Ahern , kernel-team@fb.com, Pavel Begunkov Subject: [PATCH net-next v3 14/25] io_uring: cache struct io_notif Date: Tue, 5 Jul 2022 16:01:14 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org kmalloc'ing struct io_notif is too expensive when done frequently, cache them as many other resources in io_uring. Keep two list, the first one is from where we're getting notifiers, it's protected by ->uring_lock. The second is protected by ->completion_lock, to which we queue released notifiers. Then we splice one list into another when needed. Signed-off-by: Pavel Begunkov --- include/linux/io_uring_types.h | 7 +++++ io_uring/io_uring.c | 3 ++ io_uring/notif.c | 57 +++++++++++++++++++++++++++++----- io_uring/notif.h | 5 +++ 4 files changed, 65 insertions(+), 7 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 26a1504ad24c..0a3fdaa368a4 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -244,6 +244,9 @@ struct io_ring_ctx { struct xarray io_bl_xa; struct list_head io_buffers_cache; + /* struct io_notif cache, protected by uring_lock */ + struct list_head notif_list; + struct io_hash_table cancel_table_locked; struct list_head cq_overflow_list; struct list_head apoll_cache; @@ -255,6 +258,10 @@ struct io_ring_ctx { struct io_wq_work_list locked_free_list; unsigned int locked_free_nr; + /* struct io_notif cache protected by completion_lock */ + struct list_head notif_list_locked; + unsigned int notif_locked_nr; + const struct cred *sq_creds; /* cred used for __io_sq_thread() */ struct io_sq_data *sq_data; /* if using sq thread polling */ diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 5fbbdcad14fa..6054e71e6ade 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -318,6 +318,8 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) INIT_WQ_LIST(&ctx->locked_free_list); INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func); INIT_WQ_LIST(&ctx->submit_state.compl_reqs); + INIT_LIST_HEAD(&ctx->notif_list); + INIT_LIST_HEAD(&ctx->notif_list_locked); return ctx; err: kfree(ctx->dummy_ubuf); @@ -2491,6 +2493,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) WARN_ON_ONCE(!list_empty(&ctx->ltimeout_list)); WARN_ON_ONCE(ctx->notif_slots || ctx->nr_notif_slots); + io_notif_cache_purge(ctx); io_mem_free(ctx->rings); io_mem_free(ctx->sq_sqes); diff --git a/io_uring/notif.c b/io_uring/notif.c index e9e0c5566c4a..ffbd5ce03c36 100644 --- a/io_uring/notif.c +++ b/io_uring/notif.c @@ -15,10 +15,12 @@ static void __io_notif_complete_tw(struct callback_head *cb) io_cq_lock(ctx); io_fill_cqe_aux(ctx, notif->tag, 0, notif->seq); + + list_add(¬if->cache_node, &ctx->notif_list_locked); + ctx->notif_locked_nr++; io_cq_unlock_post(ctx); percpu_ref_put(&ctx->refs); - kfree(notif); } static inline void io_notif_complete(struct io_notif *notif) @@ -45,21 +47,62 @@ static void io_uring_tx_zerocopy_callback(struct sk_buff *skb, queue_work(system_unbound_wq, ¬if->commit_work); } +static void io_notif_splice_cached(struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + spin_lock(&ctx->completion_lock); + list_splice_init(&ctx->notif_list_locked, &ctx->notif_list); + ctx->notif_locked_nr = 0; + spin_unlock(&ctx->completion_lock); +} + +void io_notif_cache_purge(struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + io_notif_splice_cached(ctx); + + while (!list_empty(&ctx->notif_list)) { + struct io_notif *notif = list_first_entry(&ctx->notif_list, + struct io_notif, cache_node); + + list_del(¬if->cache_node); + kfree(notif); + } +} + +static inline bool io_notif_has_cached(struct io_ring_ctx *ctx) + __must_hold(&ctx->uring_lock) +{ + if (likely(!list_empty(&ctx->notif_list))) + return true; + if (data_race(READ_ONCE(ctx->notif_locked_nr) <= IO_NOTIF_SPLICE_BATCH)) + return false; + io_notif_splice_cached(ctx); + return !list_empty(&ctx->notif_list); +} + struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx, struct io_notif_slot *slot) __must_hold(&ctx->uring_lock) { struct io_notif *notif; - notif = kzalloc(sizeof(*notif), GFP_ATOMIC | __GFP_ACCOUNT); - if (!notif) - return NULL; + if (likely(io_notif_has_cached(ctx))) { + notif = list_first_entry(&ctx->notif_list, + struct io_notif, cache_node); + list_del(¬if->cache_node); + } else { + notif = kzalloc(sizeof(*notif), GFP_ATOMIC | __GFP_ACCOUNT); + if (!notif) + return NULL; + /* pre-initialise some fields */ + notif->ctx = ctx; + notif->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN; + notif->uarg.callback = io_uring_tx_zerocopy_callback; + } notif->seq = slot->seq++; notif->tag = slot->tag; - notif->ctx = ctx; - notif->uarg.flags = SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN; - notif->uarg.callback = io_uring_tx_zerocopy_callback; /* master ref owned by io_notif_slot, will be dropped on flush */ refcount_set(¬if->uarg.refcnt, 1); percpu_ref_get(&ctx->refs); diff --git a/io_uring/notif.h b/io_uring/notif.h index 3d7a1d242e17..b23c9c0515bb 100644 --- a/io_uring/notif.h +++ b/io_uring/notif.h @@ -5,6 +5,8 @@ #include #include +#define IO_NOTIF_SPLICE_BATCH 32 + struct io_notif { struct ubuf_info uarg; struct io_ring_ctx *ctx; @@ -13,6 +15,8 @@ struct io_notif { u64 tag; /* see struct io_notif_slot::seq */ u32 seq; + /* hook into ctx->notif_list and ctx->notif_list_locked */ + struct list_head cache_node; union { struct callback_head task_work; @@ -41,6 +45,7 @@ struct io_notif_slot { }; int io_notif_unregister(struct io_ring_ctx *ctx); +void io_notif_cache_purge(struct io_ring_ctx *ctx); struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx, struct io_notif_slot *slot);