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Subject[PATCH net-next] net: udp: correct the document for udp_mem
Date
From: Menglong Dong <imagedong@tencent.com>

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 <imagedong@tencent.com>
---
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 d91ab28718d4..8edc1547170b 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -1012,13 +1012,11 @@ 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.

--
2.27.0
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