From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f53.google.com (mail-io1-f53.google.com [209.85.166.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CCF87A70E for ; Wed, 7 Feb 2024 17:19:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.53 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707326389; cv=none; b=RyTpXS3utOJSuKrFT1Ai8yol6CFSceBBA8/Bk9xtfF1hXko5C0qcMjEGXLevhHMPykqxDf3ZETuag/hQojKBAWrNTZFvMIFD55eZqCB2NHS47dokt6K3QAnpEuU1fdF+3rZkLnSTqWA22kcxynNDNTg/YySrrKsciFZEBqCDq+E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707326389; c=relaxed/simple; bh=i8Qdi8ws8Pdi0xD/DCla8fIwg3048KoTZDGnwE9ukZw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QqcIsen8E0JHbzxW6HFu/wNJaAUs0vm6yDLPXpdSbcsl+AcWCsWN9efApdL9Cs7kEdCQsZVEYA1my2JbUsqpZp4exSP5E6db+Rmo5S+PyhxzCnQZG4FxGfjYkizCJeiBeouv+keHGU22T6ODjb2qTacjfgIRqa69ZsvGq/P/DGo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk; spf=pass smtp.mailfrom=kernel.dk; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b=dzuuLnUQ; arc=none smtp.client-ip=209.85.166.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kernel.dk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20230601.gappssmtp.com header.i=@kernel-dk.20230601.gappssmtp.com header.b="dzuuLnUQ" Received: by mail-io1-f53.google.com with SMTP id ca18e2360f4ac-7bbdd28a52aso17088839f.1 for ; Wed, 07 Feb 2024 09:19:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20230601.gappssmtp.com; s=20230601; t=1707326386; x=1707931186; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Z+BvvT/bLt+Dtd4p+a8eUflunBIdVoGheioMCSSBG2o=; b=dzuuLnUQ0XIITZBcl37S8zN5RG8cQMZSp/aMCoYV8m78I9WDJD55/cwWWAuH6y9oaS I7oNBQOb8eCd1h1uACSHr9f/oostXAUbR62297QkfZOuceUFPuxDqN8h/hG6xAY6xQgi 8OUczQjl1vZYxRNtSuf2RDN8BDScgmxoHh5A/CMA+P4m4/o6kepCI+bNg7L+lXA4GoHP Iu0VOOLul1q/jI+cZbYCjrjBla+b/E/q7XFj2ygfCudx950Q887OgLHXBc7OXNlQGUXq nlnXGdf/mc/A5s/gpJtIx09YDIbMtredCg9ImZZshQylhPbYsMGLVPvZLhjOAe4kUb1m xgXQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707326386; x=1707931186; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Z+BvvT/bLt+Dtd4p+a8eUflunBIdVoGheioMCSSBG2o=; b=Xw+MIfZfzfOhkMVj53Dby1Lm2Xs7f1u1x3RCcnpECcyL6OKyaIbXR7Hp1clFsoF7ew YGgU2iBsI8KIWh4K1etinFgq4MKjal2b0ebnYE9TWuDxQ0iQGlGL9ZovWfziUrC1BO92 QZhHfwG14u2MJRGbI6d0u+bBLM4zGgHI3cPAiKZ7JUrpdhGUIksTMLZ7EyROnca5ZzWf xRUpqm/svTFWpeoWkGuo57kanFluYhsPnbzT9AgYg+POeATSaO6B7FYMwGWkisHhXrHY dsCKiVuOWVomzPGkR55Vo8EnOhpxJdH0aoMzg7eCiqo7FbFYbGurwcSoKl7IeDWh1CSB K+qA== X-Gm-Message-State: AOJu0Yy9LkllmKxDV99yTisaEyt5+ceuOoIJtjQvBW7xl3D9fifXqPCH q39IFFrgVDVWhvMiJxoLptYDVuz2s/TpXssvjulu0a8xX3dTYjUwYPDGk7VkSGdT51G/an8YN2Y Gpow= X-Google-Smtp-Source: AGHT+IHccnQl1OtD19qC7e2B/NbF0WJmELn0D5flhBJM0XNTL/7fjod7hH2kiTMUgAfwPCW1HXGLiA== X-Received: by 2002:a05:6602:155:b0:7c4:655:6e05 with SMTP id v21-20020a056602015500b007c406556e05mr472627iot.2.1707326386238; Wed, 07 Feb 2024 09:19:46 -0800 (PST) Received: from localhost.localdomain ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id g22-20020a6b7616000000b007bc4622d199sm421131iom.22.2024.02.07.09.19.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Feb 2024 09:19:45 -0800 (PST) From: Jens Axboe To: io-uring@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 2/6] io_uring/cancel: don't default to setting req->work.cancel_seq Date: Wed, 7 Feb 2024 10:17:36 -0700 Message-ID: <20240207171941.1091453-3-axboe@kernel.dk> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207171941.1091453-1-axboe@kernel.dk> References: <20240207171941.1091453-1-axboe@kernel.dk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Just leave it unset by default, avoiding dipping into the last cacheline (which is otherwise untouched) for the fast path of using poll to drive networked traffic. Add a flag that tells us if the sequence is valid or not, and then we can defer actually assigning the flag and sequence until someone runs cancelations. Signed-off-by: Jens Axboe --- include/linux/io_uring_types.h | 3 +++ io_uring/cancel.c | 3 +-- io_uring/cancel.h | 10 ++++++++++ io_uring/io_uring.c | 1 - io_uring/poll.c | 6 +----- 5 files changed, 15 insertions(+), 8 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 56bf733d3ee6..e19698daae1a 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -463,6 +463,7 @@ enum { REQ_F_SUPPORT_NOWAIT_BIT, REQ_F_ISREG_BIT, REQ_F_POLL_NO_LAZY_BIT, + REQ_F_CANCEL_SEQ_BIT, /* not a real bit, just to check we're not overflowing the space */ __REQ_F_LAST_BIT, @@ -535,6 +536,8 @@ enum { REQ_F_HASH_LOCKED = IO_REQ_FLAG(REQ_F_HASH_LOCKED_BIT), /* don't use lazy poll wake for this request */ REQ_F_POLL_NO_LAZY = IO_REQ_FLAG(REQ_F_POLL_NO_LAZY_BIT), + /* cancel sequence is set and valid */ + REQ_F_CANCEL_SEQ = IO_REQ_FLAG(REQ_F_CANCEL_SEQ_BIT), }; typedef void (*io_req_tw_func_t)(struct io_kiocb *req, struct io_tw_state *ts); diff --git a/io_uring/cancel.c b/io_uring/cancel.c index 8a8b07dfc444..acfcdd7f059a 100644 --- a/io_uring/cancel.c +++ b/io_uring/cancel.c @@ -58,9 +58,8 @@ bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd) return false; if (cd->flags & IORING_ASYNC_CANCEL_ALL) { check_seq: - if (cd->seq == req->work.cancel_seq) + if (io_cancel_match_sequence(req, cd->seq)) return false; - req->work.cancel_seq = cd->seq; } return true; diff --git a/io_uring/cancel.h b/io_uring/cancel.h index c0a8e7c520b6..76b32e65c03c 100644 --- a/io_uring/cancel.h +++ b/io_uring/cancel.h @@ -25,4 +25,14 @@ void init_hash_table(struct io_hash_table *table, unsigned size); int io_sync_cancel(struct io_ring_ctx *ctx, void __user *arg); bool io_cancel_req_match(struct io_kiocb *req, struct io_cancel_data *cd); +static inline bool io_cancel_match_sequence(struct io_kiocb *req, int sequence) +{ + if ((req->flags & REQ_F_CANCEL_SEQ) && sequence == req->work.cancel_seq) + return true; + + req->flags |= REQ_F_CANCEL_SEQ; + req->work.cancel_seq = sequence; + return false; +} + #endif diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index b8ca907b77eb..fd552b260eef 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -463,7 +463,6 @@ static void io_prep_async_work(struct io_kiocb *req) req->work.list.next = NULL; req->work.flags = 0; - req->work.cancel_seq = atomic_read(&ctx->cancel_seq); if (req->flags & REQ_F_FORCE_ASYNC) req->work.flags |= IO_WQ_WORK_CONCURRENT; diff --git a/io_uring/poll.c b/io_uring/poll.c index 7513afc7b702..c2b0a2d0762b 100644 --- a/io_uring/poll.c +++ b/io_uring/poll.c @@ -588,10 +588,7 @@ static int __io_arm_poll_handler(struct io_kiocb *req, struct io_poll_table *ipt, __poll_t mask, unsigned issue_flags) { - struct io_ring_ctx *ctx = req->ctx; - INIT_HLIST_NODE(&req->hash_node); - req->work.cancel_seq = atomic_read(&ctx->cancel_seq); io_init_poll_iocb(poll, mask); poll->file = req->file; req->apoll_events = poll->events; @@ -818,9 +815,8 @@ static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, if (poll_only && req->opcode != IORING_OP_POLL_ADD) continue; if (cd->flags & IORING_ASYNC_CANCEL_ALL) { - if (cd->seq == req->work.cancel_seq) + if (io_cancel_match_sequence(req, cd->seq)) continue; - req->work.cancel_seq = cd->seq; } *out_bucket = hb; return req; -- 2.43.0