/*
* Copyright (C) 2009 IBM Corp.
* Copyright (C) 2010 Red Hat Inc.
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*
* Version 1.0 wilder@us.ibm.com 2009-07-06
*/
global DelayedACKs /* LINUX_MIB_DELAYEDACKS */
global ListenOverflows /* LINUX_MIB_LISTENOVERFLOWS */
global ListenDrops /* LINUX_MIB_LISTENDROPS */
global TCPMemoryPressures /* LINUX_MIB_TCPMEMORYPRESSURES */
/**
* probe linuxmib.DelayedACKs - Count of delayed acks
* @sk: Pointer to the struct sock being acted on
* @op: Value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* linuxmib_filter_key(). If the packet passes the filter is is
* counted in the global @DelayedACKs (equivalent to SNMP's MIB
* LINUX_MIB_DELAYEDACKS)
*/
global indelack_timer
probe linuxmib.DelayedACKs = _linuxmib.DelayedACKs.* {}
probe _linuxmib.DelayedACKs.A = kernel.function("tcp_send_ack")
{
sk=$sk
if ( !indelack_timer[sk] ) next
op=1
key = linuxmib_filter_key(sk,op);
if ( key ) DelayedACKs[key] += op;
}
probe _linuxmib.DelayedACKs.B = kernel.function("tcp_delack_timer")
{
sk=$data
indelack_timer[sk]=1
op=0
}
probe _linuxmib.DelayedACKs.C = kernel.function("tcp_delack_timer").return
{
sk=$data
indelack_timer[sk]=0;
op=0
}
/**
* probe linuxmib.ListenOverflows - Count of times a listen queue overflowed
* @sk: Pointer to the struct sock being acted on
* @op: Value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* linuxmib_filter_key(). If the packet passes the filter is is
* counted in the global @ListenOverflows (equivalent to SNMP's MIB
* LINUX_MIB_LISTENOVERFLOWS)
*/
probe linuxmib.ListenOverflows=kernel.function("tcp_v4_syn_recv_sock").return
{
sk = $sk
if ( $return ) next
if ( $sk->sk_ack_backlog <= $sk->sk_max_ack_backlog ) next
op = 1;
key = linuxmib_filter_key(sk,op);
if ( key ) ListenOverflows[key] += op;
}
/**
* probe linuxmib.ListenDrops - Count of times conn request that were dropped
* @sk: Pointer to the struct sock being acted on
* @op: Value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* linuxmib_filter_key(). If the packet passes the filter is is
* counted in the global @ListenDrops (equivalent to SNMP's MIB
* LINUX_MIB_LISTENDROPS)
*/
probe linuxmib.ListenDrops=kernel.function("tcp_v4_syn_recv_sock").return
{
sk = $sk
if ( $return ) next
op = 1;
key = linuxmib_filter_key(sk,op);
if ( key ) ListenDrops[key] += op;
}
/**
* probe linuxmib.TCPMemoryPressures - Count of times memory pressure was used
* @sk: Pointer to the struct sock being acted on
* @op: Value to be added to the counter (default value of 1)
*
* The packet pointed to by @skb is filtered by the function
* linuxmib_filter_key(). If the packet passes the filter is is
* counted in the global @TCPMemoryPressures (equivalent to SNMP's MIB
* LINUX_MIB_TCPMEMORYPRESSURES)
*/
probe linuxmib.TCPMemoryPressures=kernel.function("tcp_enter_memory_pressure")
{
sk = @choose_defined($sk, 0)
op = 1;
if ( $tcp_memory_pressure ) next
key = linuxmib_filter_key(sk,op);
if ( key ) TCPMemoryPressures[key] += op;
}
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