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Commit 8fe809a9 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: add LINUX_MIB_PFMEMALLOCDROP counter 



Debugging issues caused by pfmemalloc is often tedious.

Add a new SNMP counter to more easily diagnose these problems.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Josef Bacik <jbacik@fb.com>
Acked-by: default avatarJosef Bacik <jbacik@fb.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 66109109

include/uapi/linux/snmp.h

+1 −0
Original line number Diff line number Diff line
@@ -240,6 +240,7 @@ enum 
	LINUX_MIB_SACKMERGED,

	LINUX_MIB_SACKSHIFTFALLBACK,

	LINUX_MIB_TCPBACKLOGDROP,

	LINUX_MIB_PFMEMALLOCDROP,

	LINUX_MIB_TCPMINTTLDROP, /* RFC 5082 */

	LINUX_MIB_TCPDEFERACCEPTDROP,

	LINUX_MIB_IPRPFILTER, /* IP Reverse Path Filter (rp_filter) */

net/core/filter.c

+3 −2
Original line number Diff line number Diff line
@@ -76,9 +76,10 @@ int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 
	 * allow SOCK_MEMALLOC sockets to use it as this socket is

	 * helping free memory

	 */

	if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC))

	if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {

		NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);

		return -ENOMEM;



	}

	err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);

	if (err)

		return err;

net/ipv4/proc.c

+1 −0
Original line number Diff line number Diff line
@@ -262,6 +262,7 @@ static const struct snmp_mib snmp4_net_list[] = { 
	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),

	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),

	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),

	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),

	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),

	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),

	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),