On Wednesday 14 December 2016 01:06 PM, Ingo Molnar wrote: > * Alexis Berlemont <alexis.berlem...@gmail.com> wrote: > >> Hi Masami, >> >> Many thanks for your mail. >> >> Here is another patch set which tries to fix the points you mentioned: >> >> * Skip the arguments containing a constant ($123); >> * Review the code in charge of the register renaming (search for '%' >> and parse it); >> * Minor changes (print the argument in case of error, skipping, check >> the sdt arg type index); >> >> Many thanks, >> >> Alexis. >> >> Alexis Berlemont (2): >> perf sdt: add scanning of sdt probles arguments >> perf probe: add sdt probes arguments into the uprobe cmd string > I'd like to hijack this thread to report an SDT oddity - one of my boxen > reports > lots of SDT tracepoints in 'perf list': > > mem:<addr>[/len][:access] [Hardware breakpoint] > > sdt_libc:lll_lock_wait_private [SDT event] > sdt_libc:longjmp [SDT event] > sdt_libc:longjmp_target [SDT event] > sdt_libc:memory_arena_new [SDT event] > sdt_libc:memory_arena_retry [SDT event] > sdt_libc:memory_arena_reuse [SDT event] > sdt_libc:memory_arena_reuse_free_list [SDT event] > sdt_libc:memory_arena_reuse_wait [SDT event] > sdt_libc:memory_calloc_retry [SDT event] > sdt_libc:memory_heap_free [SDT event] > ... > > But none of them work: > > Error: No permissions to read > /sys/kernel/debug/tracing/events/sdt_libc/longjmp > Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing' > > ... > > Error: File /sys/kernel/debug/tracing/events/sdt_libc/longjmp not found. > Hint: Perhaps this kernel misses some CONFIG_ setting to enable this > feature?. > > What kind of patches are required for SDT probes to work?
Hi Ingo, Works for me on my x86 Fedora 25 box. May be some permission issue? @Alexis, Planning to progress on it :) ? I would like to prepare patch for powerpc. Thanks, Ravi > Thanks, > > Ingo >
