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Wed, 22 Nov 2023 18:25:48 -0800 (PST) Received: from localhost.localdomain ([204.44.110.111]) by smtp.gmail.com with ESMTPSA id v11-20020a170902d68b00b001ce6452a741sm32880ply.25.2023.11.22.18.25.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 18:25:47 -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, liangchen.linux@gmail.com Subject: [PATCH net-next v2 2/3] page_pool: halve BIAS_MAX for fragment multiple user references Date: Thu, 23 Nov 2023 10:25:15 +0800 Message-Id: <20231123022516.6757-2-liangchen.linux@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231123022516.6757-1-liangchen.linux@gmail.com> References: <20231123022516.6757-1-liangchen.linux@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: E3A5180025 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: wea8zbtadtksbiwft8w4zmxeoyxogdmc X-HE-Tag: 1700706349-137412 X-HE-Meta: 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 SQmymCcb 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.081352, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 --- 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 df2a06d7da52..5221b5b11bad 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