From patchwork Wed Sep 29 17:25:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Wang X-Patchwork-Id: 12526403 X-Patchwork-Delegate: kuba@kernel.org 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28457C433F5 for ; Wed, 29 Sep 2021 17:25:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F188F6147F for ; Wed, 29 Sep 2021 17:25:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344535AbhI2R1A (ORCPT ); Wed, 29 Sep 2021 13:27:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56672 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244721AbhI2R06 (ORCPT ); Wed, 29 Sep 2021 13:26:58 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B3F6C06161C for ; Wed, 29 Sep 2021 10:25:17 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id o1-20020a056902110100b005b69483a0b4so4558354ybu.0 for ; Wed, 29 Sep 2021 10:25:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=5tyZguByoCxHahWkVA7vUtD9hL/qX8pSEx4rXZ5CwI4=; b=o9dIgGCGDugvfytE6fo+QXqsJQiiN9nFtWcMty4AAizRFH9l79N31ebt2h7b5+6yls BvSK295IhU+Xzwf9siC/gf6/1TpKkbv6vQgALeWo7JRFWVIqOHR8MbTzyKdQO2joj8Wb dU8lnA3NrzVAMOz3FasRDLhvaCcdxoWzA8+6VNM6wLexVXFSnaeeDQqnK/rYXB49R3g6 iHbmie4EHYlk96tM8Ww2MPXMW7RkcaryrttwarLKaexUi+HH5dyhguMU81fZMt6D3Rr/ DIOtDTxORm37vDbkvEScWylNvtZPw4egDYCzYS7a/2YY5QsOps0wEp4usp2470qnXkec vA9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=5tyZguByoCxHahWkVA7vUtD9hL/qX8pSEx4rXZ5CwI4=; b=vEHmwkWYmKd9XTERF5CA7h4bEYXF4AeZh6n3VyedG0xjmUm9lmltdExz96dyEMzyed nZ89WLVyylH8ze4vEi7bab2mZTHfDcwDVMUHSsyGkJjpWAUzAKIvQX4AtXtjoMWcVaJu 2XymcTgCIjPCqJ9PhEvzhZZiNQ+g2pSjDAYyUPesebpeOyh+H7I+cPM9vdXYTmW9FCDZ QCsnzGHi7pCDoBVr4Id2lb1QeFQQ00gG5AzMYNOxeUHAMnu/nG+JyiDaDPkk1bU1qHzf XXLpmg3jKViTi2HWMzkqpS5o8ynowUQ4FBRQg12pGcthy4qC5+FALHENw5UBpMvhCFX4 hrsg== X-Gm-Message-State: AOAM531L6rRDH8Gyd7FPQghpPR65ok9mBzDpNGGUVp4tzvL8HK8bzm16 /iSyqv9aUIvDomRo6+hxsqCWUoyVemk= X-Google-Smtp-Source: ABdhPJyFF7sifE5qNrhf5+H6t8vr/rAnN6tqeGXRZZ8pkmEcoxvVRexLtzLd4+FiSrjM1gU/hrW3n+5eQsY= X-Received: from weiwan.svl.corp.google.com ([2620:15c:2c4:201:a9d9:bcda:fa5:99c6]) (user=weiwan job=sendgmr) by 2002:a25:4cc3:: with SMTP id z186mr1290486yba.212.1632936316728; Wed, 29 Sep 2021 10:25:16 -0700 (PDT) Date: Wed, 29 Sep 2021 10:25:11 -0700 In-Reply-To: <20210929172513.3930074-1-weiwan@google.com> Message-Id: <20210929172513.3930074-2-weiwan@google.com> Mime-Version: 1.0 References: <20210929172513.3930074-1-weiwan@google.com> X-Mailer: git-send-email 2.33.0.685.g46640cef36-goog Subject: [PATCH v3 net-next 1/3] net: add new socket option SO_RESERVE_MEM From: Wei Wang To: "'David S . Miller'" , Jakub Kicinski , netdev@vger.kernel.org Cc: Eric Dumazet , Shakeel Butt Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org This socket option provides a mechanism for users to reserve a certain amount of memory for the socket to use. When this option is set, kernel charges the user specified amount of memory to memcg, as well as sk_forward_alloc. This amount of memory is not reclaimable and is available in sk_forward_alloc for this socket. With this socket option set, the networking stack spends less cycles doing forward alloc and reclaim, which should lead to better system performance, with the cost of an amount of pre-allocated and unreclaimable memory, even under memory pressure. Note: This socket option is only available when memory cgroup is enabled and we require this reserved memory to be charged to the user's memcg. We hope this could avoid mis-behaving users to abused this feature to reserve a large amount on certain sockets and cause unfairness for others. Signed-off-by: Wei Wang Signed-off-by: Eric Dumazet --- include/net/sock.h | 44 +++++++++++++++++--- include/uapi/asm-generic/socket.h | 2 + net/core/sock.c | 69 +++++++++++++++++++++++++++++++ net/core/stream.c | 2 +- net/ipv4/af_inet.c | 2 +- 5 files changed, 112 insertions(+), 7 deletions(-) diff --git a/include/net/sock.h b/include/net/sock.h index 879980de3dcd..447fddb384a4 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -269,6 +269,7 @@ struct bpf_local_storage; * @sk_omem_alloc: "o" is "option" or "other" * @sk_wmem_queued: persistent queue size * @sk_forward_alloc: space allocated forward + * @sk_reserved_mem: space reserved and non-reclaimable for the socket * @sk_napi_id: id of the last napi context to receive data for sk * @sk_ll_usec: usecs to busypoll when there is no data * @sk_allocation: allocation mode @@ -409,6 +410,7 @@ struct sock { #define sk_rmem_alloc sk_backlog.rmem_alloc int sk_forward_alloc; + u32 sk_reserved_mem; #ifdef CONFIG_NET_RX_BUSY_POLL unsigned int sk_ll_usec; /* ===== mostly read cache line ===== */ @@ -1511,20 +1513,49 @@ sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size) skb_pfmemalloc(skb); } +static inline int sk_unused_reserved_mem(const struct sock *sk) +{ + int unused_mem; + + if (likely(!sk->sk_reserved_mem)) + return 0; + + unused_mem = sk->sk_reserved_mem - sk->sk_wmem_queued - + atomic_read(&sk->sk_rmem_alloc); + + return unused_mem > 0 ? unused_mem : 0; +} + static inline void sk_mem_reclaim(struct sock *sk) { + int reclaimable; + if (!sk_has_account(sk)) return; - if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) - __sk_mem_reclaim(sk, sk->sk_forward_alloc); + + reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); + + if (reclaimable >= SK_MEM_QUANTUM) + __sk_mem_reclaim(sk, reclaimable); +} + +static inline void sk_mem_reclaim_final(struct sock *sk) +{ + sk->sk_reserved_mem = 0; + sk_mem_reclaim(sk); } static inline void sk_mem_reclaim_partial(struct sock *sk) { + int reclaimable; + if (!sk_has_account(sk)) return; - if (sk->sk_forward_alloc > SK_MEM_QUANTUM) - __sk_mem_reclaim(sk, sk->sk_forward_alloc - 1); + + reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); + + if (reclaimable > SK_MEM_QUANTUM) + __sk_mem_reclaim(sk, reclaimable - 1); } static inline void sk_mem_charge(struct sock *sk, int size) @@ -1536,9 +1567,12 @@ static inline void sk_mem_charge(struct sock *sk, int size) static inline void sk_mem_uncharge(struct sock *sk, int size) { + int reclaimable; + if (!sk_has_account(sk)) return; sk->sk_forward_alloc += size; + reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk); /* Avoid a possible overflow. * TCP send queues can make this happen, if sk_mem_reclaim() @@ -1547,7 +1581,7 @@ static inline void sk_mem_uncharge(struct sock *sk, int size) * If we reach 2 MBytes, reclaim 1 MBytes right now, there is * no need to hold that much forward allocation anyway. */ - if (unlikely(sk->sk_forward_alloc >= 1 << 21)) + if (unlikely(reclaimable >= 1 << 21)) __sk_mem_reclaim(sk, 1 << 20); } diff --git a/include/uapi/asm-generic/socket.h b/include/uapi/asm-generic/socket.h index 1f0a2b4864e4..c77a1313b3b0 100644 --- a/include/uapi/asm-generic/socket.h +++ b/include/uapi/asm-generic/socket.h @@ -126,6 +126,8 @@ #define SO_BUF_LOCK 72 +#define SO_RESERVE_MEM 73 + #if !defined(__KERNEL__) #if __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__)) diff --git a/net/core/sock.c b/net/core/sock.c index 512e629f9780..0ecb8590e043 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -947,6 +947,53 @@ void sock_set_mark(struct sock *sk, u32 val) } EXPORT_SYMBOL(sock_set_mark); +static void sock_release_reserved_memory(struct sock *sk, int bytes) +{ + /* Round down bytes to multiple of pages */ + bytes &= ~(SK_MEM_QUANTUM - 1); + + WARN_ON(bytes > sk->sk_reserved_mem); + sk->sk_reserved_mem -= bytes; + sk_mem_reclaim(sk); +} + +static int sock_reserve_memory(struct sock *sk, int bytes) +{ + long allocated; + bool charged; + int pages; + + if (!mem_cgroup_sockets_enabled || !sk->sk_memcg) + return -EOPNOTSUPP; + + if (!bytes) + return 0; + + pages = sk_mem_pages(bytes); + + /* pre-charge to memcg */ + charged = mem_cgroup_charge_skmem(sk->sk_memcg, pages, + GFP_KERNEL | __GFP_RETRY_MAYFAIL); + if (!charged) + return -ENOMEM; + + /* pre-charge to forward_alloc */ + allocated = sk_memory_allocated_add(sk, pages); + /* If the system goes into memory pressure with this + * precharge, give up and return error. + */ + if (allocated > sk_prot_mem_limits(sk, 1)) { + sk_memory_allocated_sub(sk, pages); + mem_cgroup_uncharge_skmem(sk->sk_memcg, pages); + return -ENOMEM; + } + sk->sk_forward_alloc += pages << SK_MEM_QUANTUM_SHIFT; + + sk->sk_reserved_mem += pages << SK_MEM_QUANTUM_SHIFT; + + return 0; +} + /* * This is meant for all protocols to use and covers goings on * at the socket level. Everything here is generic. @@ -1367,6 +1414,23 @@ int sock_setsockopt(struct socket *sock, int level, int optname, ~SOCK_BUF_LOCK_MASK); break; + case SO_RESERVE_MEM: + { + int delta; + + if (val < 0) { + ret = -EINVAL; + break; + } + + delta = val - sk->sk_reserved_mem; + if (delta < 0) + sock_release_reserved_memory(sk, -delta); + else + ret = sock_reserve_memory(sk, delta); + break; + } + default: ret = -ENOPROTOOPT; break; @@ -1733,6 +1797,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname, v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK; break; + case SO_RESERVE_MEM: + v.val = sk->sk_reserved_mem; + break; + default: /* We implement the SO_SNDLOWAT etc to not be settable * (1003.1g 7). @@ -2045,6 +2113,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) newsk->sk_dst_pending_confirm = 0; newsk->sk_wmem_queued = 0; newsk->sk_forward_alloc = 0; + newsk->sk_reserved_mem = 0; atomic_set(&newsk->sk_drops, 0); newsk->sk_send_head = NULL; newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; diff --git a/net/core/stream.c b/net/core/stream.c index 4f1d4aa5fb38..e09ffd410685 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -202,7 +202,7 @@ void sk_stream_kill_queues(struct sock *sk) WARN_ON(!skb_queue_empty(&sk->sk_write_queue)); /* Account for returned memory. */ - sk_mem_reclaim(sk); + sk_mem_reclaim_final(sk); WARN_ON(sk->sk_wmem_queued); WARN_ON(sk->sk_forward_alloc); diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 40558033f857..2fc6074583a4 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -135,7 +135,7 @@ void inet_sock_destruct(struct sock *sk) __skb_queue_purge(&sk->sk_receive_queue); __skb_queue_purge(&sk->sk_error_queue); - sk_mem_reclaim(sk); + sk_mem_reclaim_final(sk); if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { pr_err("Attempt to release TCP socket in state %d %p\n",