lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20231214042833.21316-2-liangchen.linux@gmail.com>
Date: Thu, 14 Dec 2023 12:28:31 +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,
	Mina Almasry <almarsymina@...gle.com>
Subject: [PATCH net-next v10 2/4] page_pool: halve BIAS_MAX for multiple user references of a fragment

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@...il.com>
Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
Reviewed-by: Mina Almasry <almarsymina@...gle.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


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ