From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZkKGnFWe" Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 428889B for ; Mon, 11 Dec 2023 20:47:01 -0800 (PST) Received: by mail-pl1-x62c.google.com with SMTP id d9443c01a7336-1d0bb7ff86cso46331365ad.1 for ; Mon, 11 Dec 2023 20:47:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702356421; x=1702961221; 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=J730iItaW8fpD9bcYiCc3WSDtwgBtsyA2Jb0R83edv4=; b=ZkKGnFWe2QV4MqqwdVSC7SMyPkbhdAPYeHdb4/caoktTHYJ0eX2i63brwyoILJPzqL RLm1OjKrOELD0Q3D51k3ahOVvqVUrXPuqty0thQ1jpcnCLvS0CjO5Ks4rhZ5Ghlg6iXz Y8Rd2NL7u5nylehT5O8fgtrBgFsWadsrvpVaRAK4aYVYwegPBjA6e8g88F7DCLFzAAWa EefmIk/+hACRXGxZ5kUIaO8ZVm0OIccN0MRkxk7l/OzSGejo5StY7G3+pyri8XatPabA c2YEoxhp1yZmDOP4Ncui9JAPs+m6k9am18GVvw3Wb7oy59fJd3zlQuXLTac6JVFIHIDv 7UwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702356421; x=1702961221; 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=J730iItaW8fpD9bcYiCc3WSDtwgBtsyA2Jb0R83edv4=; b=M5jP4kx1ADOAJjLyYgXayJ94TVAD7i3YFdnYKTkS3lzvb2rXRr1BkqS8nZXYj2Or8v jLsHgE6o6xdVLjEidOUXH/nK0ofk3AI3n3XWx2FTEAmU5u0osOtdudFAp/KK36kxIHe7 Oq0f5Qr2/TlIOgflglkLZ8twIk0CVrVSLd4LL3m1+N8tZlcgUZWX7CgEvTMrScmgLsid crDV5lcEq8FGQoOHXyMlXZgM4GX6zsFpZlAmgximfiAqDmT2TkUUtDL6JwZKR1C15Qjg t4pGgoMM4r/uSknusK+B3+TcAQr2H2S9gSh67ticF+4OqBzKEMAByQKJjf3ZDTyZapi2 V7CA== X-Gm-Message-State: AOJu0Yz/LkSArwemf4fmvqgAh2sKVCJo0K921G+/vG/Az47JEP85DDxX jygoul1trATXmrqbz9WGLVA= X-Google-Smtp-Source: AGHT+IGkzBHebNvw/5HRjapPZ7VK4RiFwjvP7xk1riUV6fcwFnr0QZYg5hhTZoUbfC4Fx2LxXV47Mw== X-Received: by 2002:a17:903:1210:b0:1d1:cc20:451d with SMTP id l16-20020a170903121000b001d1cc20451dmr6921252plh.65.1702356420717; Mon, 11 Dec 2023 20:47:00 -0800 (PST) Received: from localhost.localdomain ([89.187.161.180]) by smtp.gmail.com with ESMTPSA id c3-20020a170902848300b001d33e6521b9sm36143plo.14.2023.12.11.20.46.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Dec 2023 20:46:59 -0800 (PST) From: Liang Chen To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, hawk@kernel.org, ilias.apalodimas@linaro.org, linyunsheng@huawei.com Cc: netdev@vger.kernel.org, linux-mm@kvack.org, jasowang@redhat.com, almasrymina@google.com, liangchen.linux@gmail.com Subject: [PATCH net-next v9 2/4] page_pool: halve BIAS_MAX for multiple user references of a fragment Date: Tue, 12 Dec 2023 12:46:12 +0800 Message-Id: <20231212044614.42733-3-liangchen.linux@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231212044614.42733-1-liangchen.linux@gmail.com> References: <20231212044614.42733-1-liangchen.linux@gmail.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Referring to patch [1], in order to support multiple users referencing the same fragment and prevent overflow from pp_ref_count growing, the initial value of pp_ref_count is halved, leaving room for pp_ref_count to increment before the page is drained. [1] https://lore.kernel.org/all/20211009093724.10539-3-linyunsheng@huawei.com/ Signed-off-by: Liang Chen Reviewed-by: Yunsheng Lin --- net/core/page_pool.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 106220b1f89c..436f7ffea7b4 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -26,7 +26,7 @@ #define DEFER_TIME (msecs_to_jiffies(1000)) #define DEFER_WARN_INTERVAL (60 * HZ) -#define BIAS_MAX LONG_MAX +#define BIAS_MAX (LONG_MAX >> 1) #ifdef CONFIG_PAGE_POOL_STATS /* alloc_stat_inc is intended to be used in softirq context */ -- 2.31.1