diff options
Diffstat (limited to 'Documentation/admin-guide/dynamic-debug-howto.rst')
| -rw-r--r-- | Documentation/admin-guide/dynamic-debug-howto.rst | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/Documentation/admin-guide/dynamic-debug-howto.rst b/Documentation/admin-guide/dynamic-debug-howto.rst index 1012bd9305e9..e5a8def45f3f 100644 --- a/Documentation/admin-guide/dynamic-debug-howto.rst +++ b/Documentation/admin-guide/dynamic-debug-howto.rst @@ -70,10 +70,10 @@ statements via:: nullarbor:~ # cat <debugfs>/dynamic_debug/control # filename:lineno [module]function flags format - /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup =_ "SVCRDMA Module Removed, deregister RPC RDMA transport\012" - /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init =_ "\011max_inline : %d\012" - /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init =_ "\011sq_depth : %d\012" - /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init =_ "\011max_requests : %d\012" + net/sunrpc/svc_rdma.c:323 [svcxprt_rdma]svc_rdma_cleanup =_ "SVCRDMA Module Removed, deregister RPC RDMA transport\012" + net/sunrpc/svc_rdma.c:341 [svcxprt_rdma]svc_rdma_init =_ "\011max_inline : %d\012" + net/sunrpc/svc_rdma.c:340 [svcxprt_rdma]svc_rdma_init =_ "\011sq_depth : %d\012" + net/sunrpc/svc_rdma.c:338 [svcxprt_rdma]svc_rdma_init =_ "\011max_requests : %d\012" ... @@ -93,7 +93,7 @@ the debug statement callsites with any non-default flags:: nullarbor:~ # awk '$3 != "=_"' <debugfs>/dynamic_debug/control # filename:lineno [module]function flags format - /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process: st_sendto returned %d\012" + net/sunrpc/svcsock.c:1603 [sunrpc]svc_send p "svc_process: st_sendto returned %d\012" Command Language Reference ========================== @@ -156,6 +156,7 @@ against. Possible keywords are::: ``line-range`` cannot contain space, e.g. "1-30" is valid range but "1 - 30" is not. + ``module=foo`` combined keyword=value form is interchangably accepted The meanings of each keyword are: @@ -164,15 +165,18 @@ func of each callsite. Example:: func svc_tcp_accept + func *recv* # in rfcomm, bluetooth, ping, tcp file - The given string is compared against either the full pathname, the - src-root relative pathname, or the basename of the source file of - each callsite. Examples:: + The given string is compared against either the src-root relative + pathname, or the basename of the source file of each callsite. + Examples:: file svcsock.c - file kernel/freezer.c - file /usr/src/packages/BUILD/sgi-enhancednfs-1.4/default/net/sunrpc/svcsock.c + file kernel/freezer.c # ie column 1 of control file + file drivers/usb/* # all callsites under it + file inode.c:start_* # parse :tail as a func (above) + file inode.c:1-100 # parse :tail as a line-range (above) module The given string is compared against the module name @@ -182,6 +186,7 @@ module module sunrpc module nfsd + module drm* # both drm, drm_kms_helper format The given string is searched for in the dynamic debug format @@ -251,8 +256,8 @@ the syntax described above, but must not exceed 1023 characters. Your bootloader may impose lower limits. These ``dyndbg`` params are processed just after the ddebug tables are -processed, as part of the arch_initcall. Thus you can enable debug -messages in all code run after this arch_initcall via this boot +processed, as part of the early_initcall. Thus you can enable debug +messages in all code run after this early_initcall via this boot parameter. On an x86 system for example ACPI enablement is a subsys_initcall and:: |