[UDP]: Add memory accounting.

Signed-off-by: Takahiro Yasui <tyasui@redhat.com>
Signed-off-by: Hideo Aoki <haoki@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6f7872ba1def..17a6e46fbd43 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -446,6 +446,33 @@ tcp_dma_copybreak - INTEGER
         and CONFIG_NET_DMA is enabled.
         Default: 4096
 
+UDP variables:
+
+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.
+
+        pressure: This value was introduced to follow format of tcp_mem.
+
+        max: Number of pages allowed for queueing by all UDP sockets.
+
+        Default is calculated at boot time from amount of available memory.
+
+udp_rmem_min - INTEGER
+        Minimal size of receive buffer used by UDP sockets in moderation.
+        Each UDP socket is able to use the size for receiving data, even if
+        total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
+        Default: 4096
+
+udp_wmem_min - INTEGER
+        Minimal size of send buffer used by UDP sockets in moderation.
+        Each UDP socket is able to use the size for sending data, even if
+        total pages of UDP sockets exceed udp_mem pressure. The unit is byte.
+        Default: 4096
+
 CIPSOv4 Variables:
 
 cipso_cache_enable - BOOLEAN