From 69dfccbc1186f7091f97b70a9437d6a51313834d Mon Sep 17 00:00:00 2001 From: Menglong Dong Date: Fri, 5 Nov 2021 15:35:41 +0800 Subject: [PATCH] net: udp: correct the document for udp_mem udp_mem is a vector of 3 INTEGERs, which is used to limit the number of pages allowed for queueing by all UDP sockets. However, sk_has_memory_pressure() in __sk_mem_raise_allocated() always return false for udp, as memory pressure is not supported by udp, which means that __sk_mem_raise_allocated() will fail once pages allocated for udp socket exceeds udp_mem[0]. Therefor, udp_mem[0] is the only one that limit the number of pages. However, the document of udp_mem just express that udp_mem[2] is the limitation. So, just fix it. Signed-off-by: Menglong Dong Signed-off-by: David S. Miller --- Documentation/networking/ip-sysctl.rst | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst index c61cc02..c044311 100644 --- a/Documentation/networking/ip-sysctl.rst +++ b/Documentation/networking/ip-sysctl.rst @@ -1004,13 +1004,11 @@ udp_l3mdev_accept - BOOLEAN udp_mem - vector of 3 INTEGERs: min, pressure, max Number of pages allowed for queueing by all UDP sockets. - min: Below this number of pages UDP is not bothered about its - memory appetite. When amount of memory allocated by UDP exceeds - this number, UDP starts to moderate memory usage. + min: Number of pages allowed for queueing by all UDP sockets. pressure: This value was introduced to follow format of tcp_mem. - max: Number of pages allowed for queueing by all UDP sockets. + max: This value was introduced to follow format of tcp_mem. Default is calculated at boot time from amount of available memory. -- 2.7.4