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Message-Id: <20231130115611.6632-3-liangchen.linux@gmail.com> Date: Thu, 30 Nov 2023 19:56:09 +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, liangchen.linux@...il.com Subject: [PATCH net-next v6 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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