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Message-Id: <20231211035243.15774-3-liangchen.linux@gmail.com>
Date: Mon, 11 Dec 2023 11:52:41 +0800
From: Liang Chen <liangchen.linux@...il.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
hawk@...nel.org,
ilias.apalodimas@...aro.org,
linyunsheng@...wei.com
Cc: netdev@...r.kernel.org,
linux-mm@...ck.org,
jasowang@...hat.com,
almasrymina@...gle.com,
liangchen.linux@...il.com
Subject: [PATCH net-next v8 2/4] page_pool: halve BIAS_MAX for multiple user references of a fragment
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 <liangchen.linux@...il.com>
Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
---
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
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