Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf updates from Ingo Molnar:
 "The main changes in this cycle were:

  Kernel side changes:

   - Kprobes and uprobes changes:
      - Make their trampolines read-only while they are used
      - Make UPROBES_EVENTS default-y which is the distro practice
      - Apply misc fixes and robustization to probe point insertion.

   - add support for AMD IOMMU events

   - extend hw events on Intel Goldmont CPUs

   - ... plus misc fixes and updates.

  Tooling side changes:

   - support s390 jump instructions in perf annotate (Christian
     Borntraeger)

   - vendor hardware events updates (Andi Kleen)

   - add argument support for SDT events in powerpc (Ravi Bangoria)

   - beautify the statx syscall arguments in 'perf trace' (Arnaldo
     Carvalho de Melo)

   - handle inline functions in callchains (Jin Yao)

   - enable sorting by srcline as key (Milian Wolff)

   - add 'brstackinsn' field in 'perf script' to reuse the x86
     instruction decoder used in the Intel PT code to study hot paths to
     samples (Andi Kleen)

   - add PERF_RECORD_NAMESPACES so that the kernel can record
     information required to associate samples to namespaces, helping in
     container problem characterization. (Hari Bathini)

   - allow sorting by symbol_size in 'perf report' and 'perf top'
     (Charles Baylis)

   - in perf stat, make system wide (-a) the default option if no target
     was specified and one of following conditions is met:
      - no workload specified (current behaviour)
      - a workload is specified but all requested events are system wide
        ones, like uncore ones. (Jiri Olsa)

   - ... plus lots of other updates, enhancements, cleanups and fixes"

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (235 commits)
  perf tools: Fix the code to strip command name
  tools arch x86: Sync cpufeatures.h
  tools arch: Sync arch/x86/lib/memcpy_64.S with the kernel
  tools: Update asm-generic/mman-common.h copy from the kernel
  perf tools: Use just forward declarations for struct thread where possible
  perf tools: Add the right header to obtain PERF_ALIGN()
  perf tools: Remove poll.h and wait.h from util.h
  perf tools: Remove string.h, unistd.h and sys/stat.h from util.h
  perf tools: Remove stale prototypes from builtin.h
  perf tools: Remove string.h from util.h
  perf tools: Remove sys/ioctl.h from util.h
  perf tools: Remove a few more needless includes from util.h
  perf tools: Include sys/param.h where needed
  perf callchain: Move callchain specific routines from util.[ch]
  perf tools: Add compress.h for the *_decompress_to_file() headers
  perf mem: Fix display of data source snoop indication
  perf debug: Move dump_stack() and sighandler_dump_stack() to debug.h
  perf kvm: Make function only used by 'perf kvm' static
  perf tools: Move timestamp routines from util.h to time-utils.h
  perf tools: Move units conversion/formatting routines to separate object
  ...

1 files changed, 36 insertions, 1 deletions

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 03eb81f30d0d..a5b3777ffee6 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -2,19 +2,26 @@
 
 #include "../perf.h"
 
+#include <inttypes.h>
 #include <string.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <sys/wait.h>
 #include <api/debug.h>
 #include <linux/time64.h>
-
+#ifdef HAVE_BACKTRACE_SUPPORT
+#include <execinfo.h>
+#endif
 #include "cache.h"
 #include "color.h"
 #include "event.h"
 #include "debug.h"
+#include "print_binary.h"
 #include "util.h"
 #include "target.h"
 
+#include "sane_ctype.h"
+
 int verbose;
 bool dump_trace = false, quiet = false;
 int debug_ordered_events;
@@ -244,3 +251,31 @@ void perf_debug_setup(void)
 {
 	libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
 }
+
+/* Obtain a backtrace and print it to stdout. */
+#ifdef HAVE_BACKTRACE_SUPPORT
+void dump_stack(void)
+{
+	void *array[16];
+	size_t size = backtrace(array, ARRAY_SIZE(array));
+	char **strings = backtrace_symbols(array, size);
+	size_t i;
+
+	printf("Obtained %zd stack frames.\n", size);
+
+	for (i = 0; i < size; i++)
+		printf("%s\n", strings[i]);
+
+	free(strings);
+}
+#else
+void dump_stack(void) {}
+#endif
+
+void sighandler_dump_stack(int sig)
+{
+	psignal(sig, "perf");
+	dump_stack();
+	signal(sig, SIG_DFL);
+	raise(sig);
+}