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page_pool: halve BIAS_MAX for multiple user references of a fragment

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Up to now, we were only subtracting from the number of used page fragments
to figure out when a page could be freed or recycled. A following patch
introduces support for multiple users referencing the same fragment. So
reduce the initial page fragments value to half to avoid overflowing.

Signed-off-by: Liang Chen <liangchen.linux@gmail.com>
Reviewed-by: Yunsheng Lin <linyunsheng@huawei.com>
Reviewed-by: Mina Almasry <almarsymina@google.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Liang Chen 2023-12-15 11:30:09 +08:00 committed by David S. Miller
parent 66fe896351
commit aaf153aece
1 changed files with 1 additions and 1 deletions
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2
net/core/page_pool.c
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@ -28,7 +28,7 @@
#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 */