From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f180.google.com (mail-pf1-f180.google.com [209.85.210.180]) (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 3ED9917545 for ; Wed, 24 Jan 2024 02:54:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.180 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706064869; cv=none; b=dvieLRvjcY9/kbw/vNwV7BihYjY7enWTbzeEZJu6SmmkKpDZCraam24vKK5Ktbxx4rkR28hXxkSmalT2/Vw434HsAg4Zn1Vf+04G9FuXOrTkOiQun9t/bxWwRRWAW7F5zO1bytf7e+hveiP+G36rPI0xlp7zmjXPNbxrI55dinE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706064869; c=relaxed/simple; bh=tt8whk6QkKHecHFyCKI/nRn5ZBU9W9pAuOHdt0se2xg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=uhihqm79EcwVNnCbylNd7kk82zYoU49m8ReGeqQm+uOkEgj7Hq+ETP5mSroPAwCUMotp5KWil6D3NfHp04lESa68vfa2WItCtY3of1b/5FiQFKmw1pi3fr1KbKObhPG7PgO/aH+K3bO3Ezq5aLUehY2a/64oKnijSMmOTusvqC0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fastly.com; spf=pass smtp.mailfrom=fastly.com; dkim=pass (1024-bit key) header.d=fastly.com header.i=@fastly.com header.b=tH9zr1wY; arc=none smtp.client-ip=209.85.210.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fastly.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fastly.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=fastly.com header.i=@fastly.com header.b="tH9zr1wY" Received: by mail-pf1-f180.google.com with SMTP id d2e1a72fcca58-6dc6f47302bso1936473b3a.1 for ; Tue, 23 Jan 2024 18:54:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastly.com; s=google; t=1706064867; x=1706669667; 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=bq2iCmnPB94WcqySTTnm3WLG+4jkf9fY7fGI3ZdGS38=; b=tH9zr1wY32bhLbQn/L8zBfhSab4FuzEwR8XHnAg0JZxyF5etL9PHPdUzaJ52dEUPDe aZs2FFZBtJjjfqqAKfOWFHCosxXBC3i0vhbrN+yKlSBRUksx57UhpyNsIfo5r8vxq5Ye U2bIvWJLs0ih0exY0aDVnO8rRndkkhP2Ts2JQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706064867; x=1706669667; 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=bq2iCmnPB94WcqySTTnm3WLG+4jkf9fY7fGI3ZdGS38=; b=m7Wfyh63DUkVwk5GvtfSaptxmv4Va6HQgU5yWlivM7TRFzILN9v5X45s5NwPJugYhS /bzHKGEw6kXmn0ohEZkZk8neWJY5JXvarFJRfEEup5CJflhtkqfh3Hi51KFHXaScih1F 9zvlhyOm9ki7AJqh1ePtScx52rVnE2lnop0ZtJzZd7BVgd/LqqH0OatR730MlLMDANuA 9vmKhiV79rGOVh7ttA2lWA+Wb+lB0VhRCwQe8k3LL+7jNEvZdILOnr4xhR0StnqL336H ZR227p4VaLsjnSYvx24lcQipkyCMDMNDCKGmPN1NpsVB9R3DQINtFLDyG6M929p12Az3 Qxng== X-Gm-Message-State: AOJu0YwxYOVhVFCqg28lIaMM1TFUl4/dCztY4vYeL8sflphBS6uHDwOR rdtPp+jGh/KVUCjIwCB1cyYmOOLPe4D+a/tmzn13EDiPDFJHpN+dMsHyWri/xMk= X-Google-Smtp-Source: AGHT+IGodI8N0Czn5sWE4mbKrdlX6VeLBQ+z79W6omRxv5iM82o7VtlJXdsv7TV9KmnVN9aTE4/aNA== X-Received: by 2002:a05:6a00:3a09:b0:6db:a0e5:7ec3 with SMTP id fj9-20020a056a003a0900b006dba0e57ec3mr9228809pfb.22.1706064867592; Tue, 23 Jan 2024 18:54:27 -0800 (PST) Received: from localhost.localdomain ([2620:11a:c018:0:ea8:be91:8d1:f59b]) by smtp.gmail.com with ESMTPSA id z14-20020a62d10e000000b006d9b38f2e75sm12974229pfg.32.2024.01.23.18.54.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jan 2024 18:54:26 -0800 (PST) From: Joe Damato To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: chuck.lever@oracle.com, jlayton@kernel.org, linux-api@vger.kernel.org, brauner@kernel.org, edumazet@google.com, davem@davemloft.net, alexander.duyck@gmail.com, sridhar.samudrala@intel.com, kuba@kernel.org, Joe Damato Subject: [net-next 2/3] eventpoll: Add per-epoll busy poll packet budget Date: Wed, 24 Jan 2024 02:53:58 +0000 Message-Id: <20240124025359.11419-3-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240124025359.11419-1-jdamato@fastly.com> References: <20240124025359.11419-1-jdamato@fastly.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When using epoll-based busy poll, the packet budget is hardcoded to BUSY_POLL_BUDGET (8). Add support for a per-epoll context busy poll packet budget. If not specified, the default value (BUSY_POLL_BUDGET) is used. Signed-off-by: Joe Damato --- fs/eventpoll.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 4503fec01278..40bd97477b91 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -229,6 +229,8 @@ struct eventpoll { unsigned int napi_id; /* busy poll timeout */ u64 busy_poll_usecs; + /* busy poll packet budget */ + u16 busy_poll_budget; #endif #ifdef CONFIG_DEBUG_LOCK_ALLOC @@ -437,10 +439,14 @@ static bool ep_busy_loop_end(void *p, unsigned long start_time) static bool ep_busy_loop(struct eventpoll *ep, int nonblock) { unsigned int napi_id = READ_ONCE(ep->napi_id); + u16 budget = READ_ONCE(ep->busy_poll_budget); + + if (!budget) + budget = BUSY_POLL_BUDGET; if ((napi_id >= MIN_NAPI_ID) && ep_busy_loop_on(ep)) { napi_busy_loop(napi_id, nonblock ? NULL : ep_busy_loop_end, ep, false, - BUSY_POLL_BUDGET); + budget); if (ep_events_available(ep)) return true; /* @@ -2098,6 +2104,7 @@ static int do_epoll_create(int flags) } #ifdef CONFIG_NET_RX_BUSY_POLL ep->busy_poll_usecs = 0; + ep->busy_poll_budget = 0; #endif ep->file = file; fd_install(fd, file); -- 2.25.1