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  1. 21 1月, 2017 3 次提交
  3. 20 1月, 2017 1 次提交
  5. 18 1月, 2017 2 次提交
  7. 17 1月, 2017 10 次提交
  9. 14 1月, 2017 1 次提交
    • M
      kprobes, extable: Identify kprobes trampolines as kernel text area · 5b485629
      由 Masami Hiramatsu 提交于 
      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: NJosh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
Acked-by: NPeter 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: NIngo Molnar <mingo@kernel.org>
      5b485629
  11. 12 1月, 2017 14 次提交
  13. 11 1月, 2017 2 次提交
  15. 05 1月, 2017 2 次提交
    • D
      perf/x86: Set pmu->module in Intel PMU modules · 74545f63
      由 David Carrillo-Cisneros 提交于 
      The conversion of Intel PMU drivers into modules did not include reference
counting. The machine will crash when attempting to  access deleted code
if an event from a module PMU is started and the module removed before the
event is destroyed.

i.e. this crashes the machine:

	$ insmod intel-rapl-perf.ko
	$ perf stat -e power/energy-cores/ -C 0 &
	$ rmmod intel-rapl-perf.ko

Set THIS_MODULE to pmu->module in Intel module PMUs so that generic code
can handle reference counting and deny rmmod while an event still exists.
Signed-off-by: NDavid Carrillo-Cisneros <davidcc@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1482455860-116269-1-git-send-email-davidcc@google.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
      74545f63
    • I
      Merge tag 'perf-urgent-for-mingo-4.10-20170104' of... · 4e06d4f0
      由 Ingo Molnar 提交于 
      Merge tag 'perf-urgent-for-mingo-4.10-20170104' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Pull perf/urgent fixes and one improvement from Arnaldo Carvalho de Melo:

Fixes:

  - Fix prev/next_prio formatting for deadline tasks in libtraceevent (Daniel Bristot de Oliveira)

  - Robustify reading of build-ids from /sys/kernel/note (Arnaldo Carvalho de Melo)

  - Fix building some sample/bpf in Alpine Linux 3.4 (Arnaldo Carvalho de Melo)

  - Fix 'make install-bin' to install libtraceevent plugins (Arnaldo Carvalho de Melo)

  - Fix 'perf record --switch-output' documentation and comment (Jiri Olsa)

  - Fix 'perf probe' for cross arch probing (Masami Hiramatsu)

Improvement:

  - Show total scheduling time in 'perf sched timehist' (Namhyumg Kim)
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      4e06d4f0
  17. 04 1月, 2017 5 次提交