On 7/19/22 02:46, Jim Cromie wrote: > -You can view the currently configured behaviour of all the debug > -statements via:: > +You can view the currently configured behaviour in the *prdbg* catalog: > > - nullarbor:~ # cat <debugfs>/dynamic_debug/control > + :#> head -n7 /proc/dynamic_debug/control > # filename:lineno [module]function flags format > - 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" > - ... > + init/main.c:1179 [main]initcall_blacklist =_ "blacklisting initcall %s\012 > + init/main.c:1218 [main]initcall_blacklisted =_ "initcall %s blacklisted\012" > + init/main.c:1424 [main]run_init_process =_ " with arguments:\012" > + init/main.c:1426 [main]run_init_process =_ " %s\012" > + init/main.c:1427 [main]run_init_process =_ " with environment:\012" > + init/main.c:1429 [main]run_init_process =_ " %s\012" > The block above is screen output, so keep using literal code block marker (::). What isn't described in the patch description is $PS1, which changed to just root prompt (without username). > +Kernel Configuration > +==================== > + > +Dynamic Debug is enabled via kernel config items: > + > + CONFIG_DYNAMIC_DEBUG=y # build catalog, enables CORE > + CONFIG_DYNAMIC_DEBUG_CORE=y # enable mechanics only, skip catalog > + Also use literal code blockhere > +Fedora's distro-kernel has both, and has 7250 *prdbgs*. Each callsite > +record uses 56 bytes, so the impact on memory is non-trivial. > + > +If you do not want to enable dynamic debug globally (i.e. in some embedded > +system), you may set ``CONFIG_DYNAMIC_DEBUG_CORE`` as basic support of dynamic > +debug and add ``ccflags := -DDYNAMIC_DEBUG_MODULE`` into the Makefile of any > +modules which you'd like to dynamically debug later. > + This assumes one has Fedora installed, so I think this should be written as distro-agnostic. Thanks. -- An old man doll... just what I always wanted! - Clara
