From: Liang Chen <liangchen.linux@gmail.com>
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 v3 2/3] page_pool: halve BIAS_MAX for fragment multiple user references
Date: Fri, 24 Nov 2023 15:34:38 +0800 [thread overview]
Message-ID: <20231124073439.52626-3-liangchen.linux@gmail.com> (raw)
In-Reply-To: <20231124073439.52626-1-liangchen.linux@gmail.com>
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@gmail.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 0c6c2b11aabe..24b83dfe6968 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
next prev parent reply other threads:[~2023-11-24 7:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-24 7:34 [PATCH net-next v3 0/3] skbuff: Optimize SKB coalescing for page pool Liang Chen
2023-11-24 7:34 ` [PATCH net-next v3 1/3] page_pool: Rename pp_frag_count to pp_ref_count Liang Chen
2023-11-25 11:53 ` Yunsheng Lin
2023-11-27 4:21 ` Liang Chen
2023-11-24 7:34 ` Liang Chen [this message]
2023-11-25 12:01 ` [PATCH net-next v3 2/3] page_pool: halve BIAS_MAX for fragment multiple user references Yunsheng Lin
2023-11-27 4:22 ` Liang Chen
2023-11-24 7:34 ` [PATCH net-next v3 3/3] skbuff: Optimization of SKB coalescing for page pool Liang Chen
2023-11-25 12:16 ` Yunsheng Lin
2023-11-27 4:23 ` Liang Chen
2023-11-27 10:48 ` Yunsheng Lin
2023-11-28 10:41 ` Liang Chen
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