1. 26 Jan, 2017 12 commits
  2. 20 Jan, 2017 4 commits
  3. 18 Jan, 2017 2 commits
  4. 17 Jan, 2017 5 commits
  5. 16 Jan, 2017 5 commits
  6. 14 Jan, 2017 1 commit
    • Masami Hiramatsu's avatar
      kprobes, extable: Identify kprobes trampolines as kernel text area · 5b485629
      Masami Hiramatsu authored
      Improve __kernel_text_address()/kernel_text_address() to return
      true if the given address is on a kprobe's instruction slot
      trampoline.
      
      This can help stacktraces to determine the address is on a
      text area or not.
      
      To implement this atomically in is_kprobe_*_slot(), also change
      the insn_cache page list to an RCU list.
      
      This changes timings a bit (it delays page freeing to the RCU garbage
      collection phase), but none of that is in the hot path.
      
      Note: this change can add small overhead to stack unwinders because
      it adds 2 additional checks to __kernel_text_address(). However, the
      impact should be very small, because kprobe_insn_pages list has 1 entry
      per 256 probes(on x86, on arm/arm64 it will be 1024 probes),
      and kprobe_optinsn_pages has 1 entry per 32 probes(on x86).
      In most use cases, the number of kprobe events may be less
      than 20, which means that is_kprobe_*_slot() will check just one entry.
      Tested-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
      Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andrey Konovalov <andreyknvl@google.com>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/148388747896.6869.6354262871751682264.stgit@devbox
      [ Improved the changelog and coding style. ]
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      5b485629
  7. 12 Jan, 2017 1 commit
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo-4.11-20170111' of... · f913f3a6
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo-4.11-20170111' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
      
      New features:
      
      - Add more triggers to switch the output file (perf.data.TIMESTAMP).
      
        Now, in addition to switching to a different output file when
        receiving a SIGUSR2, one can also specify file size and time based
        triggers:
      
             perf record -a --switch-output=signal
      
        is equivalent to what we had before:
      
             perf record -a --switch-output
      
        While we can also ask for the file to be "sliced" by size, taking
        into account that that will happen only when we get woken up by
        the kernel, i.e. one has to take into account the --mmap-pages (the
        size of the perf mmap ring buffer):
      
             perf record -a --switch-output=2G
      
        will break the perf.data output into multiple files limited to 2GB
        of samples, right when generating the output.
      
        For time based samples, alert() will be used, so to have 1 minute
        limited perf.data output files:
      
            perf record -a --switch-output=1m
      
        (Jiri Olsa)
      
      - Remove the need to use -e only for syscalls and --event only for
        tracepoints/HW/SW/etc events, i.e. now one can use:
      
            perf trace -e nanosleep,futex,sched:sched_switch ./workload
      
        or:
      
            perf trace --event nanosleep,futex,sched:sched_switch ./workload
      
        And have it tracing raw_syscalls:sys_{enter,exit} for the nanosleep
        and futex syscalls, formatting those as strace does while also
        tracing sched:sched_switch, ordering it all into one strace like
        output.
      
        Using '!' as the first character in the -e/--event argument remains
        a way to negate the list of syscalls, i.e. all syscalls except for
        the ones specified, doesn't affect the other kinds of events.
      
        E.g:
      
        [root@jouet ~] # perf trace -e sched:sched_switch,nanosleep usleep 1
           0.000 ( 0.028 ms): usleep/28150 nanosleep(rqtp: 0x7ffe4201b9f0) ...
           0.028 (         ): sched:sched_switch:usleep:28150 [120] S ==> swapper/0:0 [120])
           0.000 ( 0.065 ms): usleep/28150  ... [continued]: nanosleep()) = 0
        [root@jouet ~]#
      
        (Arnaldo Carvalho de Melo)
      
      - 'perf kallsyms' toy tool to look for extended symbol information on
        the running kernel and demonstrate the machine/thread/symbol APIs for
        use in other tools, such as 'perf probe' (Arnaldo Carvalho de Melo)
      
      Infrastructure improvements:
      
      - Add missing linux/kernel.h include to subcmd.h (Arnaldo Carvalho de Melo)
        tools: Sync x86's vmx.h with the kernel
      
      - Create libdir directory before installing libperf-jvmti.so (Laura Abbott)
      
      - Fix typo in perf_evlist__start_workload() (Soramichi Akiyama)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      f913f3a6
  8. 11 Jan, 2017 10 commits