Display NFS command
echo 65535 > /proc/sys/sunrpc/nfs_debug
dmesg | grep call_start
From dprintk
echo 65535 > /proc/sys/sunrpc/nfs_debug
echo 65535 > /proc/sys/sunrpc/rpc_debug
/*
* RPC debug facilities
*/
#define RPCDBG_XPRT 0x0001
#define RPCDBG_CALL 0x0002
#define RPCDBG_DEBUG 0x0004
#define RPCDBG_NFS 0x0008
#define RPCDBG_AUTH 0x0010
#define RPCDBG_BIND 0x0020
#define RPCDBG_SCHED 0x0040
#define RPCDBG_TRANS 0x0080
#define RPCDBG_SVCXPRT 0x0100
#define RPCDBG_SVCDSP 0x0200
#define RPCDBG_MISC 0x0400
#define RPCDBG_CACHE 0x0800
#define RPCDBG_ALL 0x7fff
//如果没有指明类型,默认是RPCDBG_FACILITY,在不同文件里它的定义不一样
/*
* NFS debug flags
*/
#define NFSDBG_VFS 0x0001
#define NFSDBG_DIRCACHE 0x0002
#define NFSDBG_LOOKUPCACHE 0x0004
#define NFSDBG_PAGECACHE 0x0008
#define NFSDBG_PROC 0x0010
#define NFSDBG_XDR 0x0020
#define NFSDBG_FILE 0x0040
#define NFSDBG_ROOT 0x0080
#define NFSDBG_CALLBACK 0x0100
#define NFSDBG_CLIENT 0x0200
#define NFSDBG_MOUNT 0x0400
#define NFSDBG_FSCACHE 0x0800
#define NFSDBG_PNFS 0x1000
#define NFSDBG_PNFS_LD 0x2000
#define NFSDBG_STATE 0x4000
#define NFSDBG_ALL 0xFFFF
//如果没有指明类型,默认是NFSDBG_FACILITY,在不同文件里它的定义不一样
rpcdebug command
rpcdebug -m nfs -c
rpcdebug -m nfs -s all
rpcdebug -m nfs -s proc
rpcdebug -m nfs -s file
rpcdebug -m nfs -s dircache
rpcdebug -m nfs -s pagecache
rpcdebug -m nfs -s fscache
rpcdebug -m nfs -s client
rpcdebug -m nfs -s state
rpcdebug -m nfs -s xdr
rpcdebug -m nfs -s vfs
dmesg
Kernel trace
内核中形如trace_xxxx_yyyy
的宏,如trace_nfs4_lookup
会展开成下面形状
#define DEFINE_NFS4_LOOKUP_EVENT(name) \
DEFINE_EVENT(nfs4_lookup_event, name, \
TP_PROTO( \
const struct inode *dir, \
const struct qstr *name, \
int error \
), \
TP_ARGS(dir, name, error))
DEFINE_NFS4_LOOKUP_EVENT(nfs4_lookup);
使用方法
mount -t debugfs nodev /sys/kernel/debug
echo 1 > /sys/kernel/debug/tracing/events/fs/enable
echo 1 > /sys/kernel/debug/tracing/events/filelock/enable
#默认这几个文件没有,需要用一个nfs请求触发,系统会创建这几个文件
echo 1 > /sys/kernel/debug/tracing/events/nfs/enable
echo 1 > /sys/kernel/debug/tracing/events/nfs4/enable
echo 1 > /sys/kernel/debug/tracing/events/sunrpc/enable
echo 1 > /sys/kernel/debug/tracing/tracing_on
echo 0 > /sys/kernel/debug/tracing/tracing_on
cat /sys/kernel/debug/tracing/trace
echo > /sys/kernel/debug/tracing/trace
image.png
增加log
printk(KERN_WARNING, "xxxx");
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