Hi Alex,
For page_pool BIAS stuff I would really appreciate your review please.
-Jesper
On 11/12/2023 04.52, Liang Chen wrote:
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@xxxxxxxxxx/
Signed-off-by: Liang Chen <liangchen.linux@xxxxxxxxx>
Reviewed-by: Yunsheng Lin <linyunsheng@xxxxxxxxxx>
---
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 */
