1. 27 Apr, 2015 5 commits
    • Petr Holasek's avatar
      perf bench numa: Fix immediate meeting of convergence condition · 1d90a685
      Petr Holasek authored
      This patch fixes the race in the beginning of benchmark run when some
      threads hasn't got assigned curr_cpu yet so they don't occur in
      nodes-of-process stats and benchmark concludes that all remaining
      threads are converged already.
      
      The race can be reproduced with small amount of threads and some bigger
      amount of shared process memory, e.g. one process, two threads and 5GB
      of process memory.
      Signed-off-by: default avatarPetr Holasek <pholasek@redhat.com>
      Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Link: http://lkml.kernel.org/r/1429198699-25039-4-git-send-email-pholasek@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      1d90a685
    • Petr Holasek's avatar
      perf bench numa: Fixes of --quiet argument · 24f1ced1
      Petr Holasek authored
      Corrected description and fixed function of --quiet argument.
      Signed-off-by: default avatarPetr Holasek <pholasek@redhat.com>
      Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Link: http://lkml.kernel.org/r/1429198699-25039-2-git-send-email-pholasek@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      24f1ced1
    • Davidlohr Bueso's avatar
      perf bench futex: Fix hung wakeup tasks after requeueing · 052b0f6e
      Davidlohr Bueso authored
      The futex-requeue benchmark can hang because of missing wakeups once the
      benchmark is done, ie:
      
      [Run 1]: Requeued 1024 of 1024 threads in 0.3290 ms
      perf: couldn't wakeup all tasks (135/1024)
      
      This bug, while perhaps suggesting missing wakeups in kernel futex code,
      is merely a consequence of the crappy FUTEX_CMP_REQUEUE man page,
      incorrectly mentioning that the number of requeued tasks is in fact
      returned, not the wakeups.
      
      This patch acknowledges this and updates the corresponding futex_wake
      code around it.
      Signed-off-by: default avatarDavidlohr Bueso <dbueso@suse.de>
      Cc: Mel Gorman <mgorman@suse.de>
      Link: http://lkml.kernel.org/r/1429894848.10273.44.camel@stgolabs.netSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      052b0f6e
    • He Kuang's avatar
      perf probe: Fix bug with global variables handling · d13855ef
      He Kuang authored
      There are missing curly braces which causes find_variable() return wrong
      value when probing with global variables.
      
      This problem can be reproduced as following:
      
        $ perf probe -v --add='generic_perform_write global_variable_for_test'
        ...
        Try to find probe point from debuginfo.
        Probe point found: generic_perform_write+0
        Searching 'global_variable_for_test' variable in context.
        An error occurred in debuginfo analysis (-2).
          Error: Failed to add events. Reason: No such file or directory (Code: -2)
      
      After this patch:
      
        $ perf probe -v --add='generic_perform_write global_variable_for_test'
        ...
        Converting variable global_variable_for_test into trace event.
        global_variable_for_test type is int.
        Found 1 probe_trace_events.
        Opening /sys/kernel/debug/tracing/kprobe_events write=1
        Added new event:
        Writing event: p:probe/generic_perform_write _stext+1237464
        global_variable_for_test=@global_variable_for_test+0:s32
          probe:generic_perform_write (on generic_perform_write with
          global_variable_for_test)
      
        You can now use it in all perf tools, such as:
      
            perf record -e probe:generic_perform_write -aR sleep 1
      Signed-off-by: default avatarHe Kuang <hekuang@huawei.com>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/r/1429949338-18678-1-git-send-email-hekuang@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      d13855ef
    • Wang Nan's avatar
      perf top: Fix a segfault when kernel map is restricted. · c6718350
      Wang Nan authored
      Perf top raise a warning if a kernel sample is collected but kernel map
      is restricted. The warning message needs to dereference al.map->dso...
      
      However, previous perf_event__preprocess_sample() doesn't always
      guarantee al.map != NULL, for example, when kernel map is restricted.
      
      This patch validates al.map before dereferencing, avoid the segfault.
      
      Before this patch:
      
       $ cat /proc/sys/kernel/kptr_restrict
       1
       $ perf top -p  120183
       perf: Segmentation fault
       -------- backtrace --------
       /path/to/perf[0x509868]
       /lib64/libc.so.6(+0x3545f)[0x7f9a1540045f]
       /path/to/perf[0x448820]
       /path/to/perf(cmd_top+0xe3c)[0x44a5dc]
       /path/to/perf[0x4766a2]
       /path/to/perf(main+0x5f5)[0x42e545]
       /lib64/libc.so.6(__libc_start_main+0xf4)[0x7f9a153ecbd4]
       /path/to/perf[0x42e674]
      
      And gdb call trace:
      
       Program received signal SIGSEGV, Segmentation fault.
       perf_event__process_sample (machine=0xa44030, sample=0x7fffffffa4c0, evsel=0xa43b00, event=0x7ffff41c3000, tool=0x7fffffffa8a0)
          at builtin-top.c:736
       736				  !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
       (gdb) bt
       #0  perf_event__process_sample (machine=0xa44030, sample=0x7fffffffa4c0, evsel=0xa43b00, event=0x7ffff41c3000, tool=0x7fffffffa8a0)
           at builtin-top.c:736
       #1  perf_top__mmap_read_idx (top=top@entry=0x7fffffffa8a0, idx=idx@entry=0) at builtin-top.c:855
       #2  0x000000000044a5dd in perf_top__mmap_read (top=0x7fffffffa8a0) at builtin-top.c:872
       #3  __cmd_top (top=0x7fffffffa8a0) at builtin-top.c:997
       #4  cmd_top (argc=<optimized out>, argv=<optimized out>, prefix=<optimized out>) at builtin-top.c:1267
       #5  0x00000000004766a3 in run_builtin (p=p@entry=0x8a6ce8 <commands+264>, argc=argc@entry=3, argv=argv@entry=0x7fffffffdf70)
            at perf.c:371
       #6  0x000000000042e546 in handle_internal_command (argv=0x7fffffffdf70, argc=3) at perf.c:430
       #7  run_argv (argv=0x7fffffffdcf0, argcp=0x7fffffffdcfc) at perf.c:474
       #8  main (argc=3, argv=0x7fffffffdf70) at perf.c:589
       (gdb)
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Zefan Li <lizefan@huawei.com>
      Link: http://lkml.kernel.org/r/1429946703-80807-1-git-send-email-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c6718350
  2. 24 Apr, 2015 2 commits
  3. 23 Apr, 2015 4 commits
    • Bobby Powers's avatar
      tools lib api: Undefine _FORTIFY_SOURCE before setting it · de28c15d
      Bobby Powers authored
      Some toolchains (like Hardened Gentoo) define _FORTIFY_SOURCE in the
      built-in, default args.  This causes perf builds to fail with:
      
      <command-line>:0:0: error: "_FORTIFY_SOURCE" redefined [-Werror]
      <built-in>: note: this is the location of the previous definition cc1:
      all warnings being treated as errors
      
      To avoid this, undefine _FORTIFY_SOURCE before (possibly re-)defining it
      in tools/lib/api.
      
      v2 applies cleanly on top of already pulled kbuild changes for 4.1-rc1.
      Signed-off-by: default avatarBobby Powers <bobbypowers@gmail.com>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Cc: Dirk Gouders <dirk@gouders.net>
      Cc: Michal Marek <mmarek@suse.cz>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: linux-kbuild@vger.kernel.org
      Link: http://lkml.kernel.org/r/1429658381-3039-1-git-send-email-bobbypowers@gmail.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      de28c15d
    • Will Deacon's avatar
      perf kmem: Consistently use PRIu64 for printing u64 values · 6145c259
      Will Deacon authored
      Building the perf tool for 32-bit ARM results in the following build
      error due to a combination of an incorrect conversion specifier and
      compiling with -Werror:
      
        builtin-kmem.c: In function ‘print_page_summary’:
        builtin-kmem.c:644:9: error: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘u64’ [-Werror=format=]
                 nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
                 ^
        builtin-kmem.c:647:9: error: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘u64’ [-Werror=format=]
                 (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
                 ^
        cc1: all warnings being treated as errors
      
      This patch fixes the problem by consistently using PRIu64 for printing
      out u64 values.
      Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Joonsoo Kim <js1304@gmail.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Link: http://lkml.kernel.org/r/1429796437-1790-1-git-send-email-will.deacon@arm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      6145c259
    • Arnaldo Carvalho de Melo's avatar
      perf trace: Disable events and drain events when forked workload ends · 02ac5421
      Arnaldo Carvalho de Melo authored
      We were not checking in the inner event processing loop if the forked workload
      had finished, which, on a busy system, may make it take a long time trying to
      drain events, entering a seemingly neverending loop, waiting for the system to
      get idle enough to make it drain the buffers.
      
      Fix it by disabling the events when 'done' is true, in the inner loop, to start
      draining what is in the buffers.
      
      Now:
      
      [root@ssdandy ~]# time trace --filter-pids 14003 -a sleep 1 | tail
        996.748 ( 0.002 ms): sh/30296 rt_sigprocmask(how: SETMASK, nset: 0x7ffc83418160, sigsetsize: 8) = 0
        996.751 ( 0.002 ms): sh/30296 rt_sigprocmask(how: BLOCK, nset: 0x7ffc834181f0, oset: 0x7ffc83418270, sigsetsize: 8) = 0
        996.755 ( 0.002 ms): sh/30296 rt_sigaction(sig: INT, act: 0x7ffc83417f50, oact: 0x7ffc83417ff0, sigsetsize: 8) = 0
       1004.543 ( 0.362 ms): tail/30198  ... [continued]: read()) = 4096
       1004.548 ( 7.791 ms): sh/30296 wait4(upid: -1, stat_addr: 0x7ffc834181a0) ...
       1004.975 ( 0.427 ms): tail/30198 read(buf: 0x7633f0, count: 8192) = 4096
       1005.390 ( 0.410 ms): tail/30198 read(buf: 0x765410, count: 8192) = 4096
       1005.743 ( 0.348 ms): tail/30198 read(buf: 0x7633f0, count: 8192) = 4096
       1006.197 ( 0.449 ms): tail/30198 read(buf: 0x765410, count: 8192) = 4096
       1006.492 ( 0.290 ms): tail/30198 read(buf: 0x7633f0, count: 8192) = 4096
      
      real	0m1.219s
      user	0m0.704s
      sys	0m0.331s
      [root@ssdandy ~]#
      Reported-by: default avatarMichael Petlan <mpetlan@redhat.com>
      Suggested-by: default avatarJiri Olsa <jolsa@redhat.com>
      Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Don Zickus <dzickus@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/n/tip-p6kpn1b26qcbe47pufpw0tex@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      02ac5421
    • Arnaldo Carvalho de Melo's avatar
      perf trace: Enable events when doing system wide tracing and starting a workload · cb24d01d
      Arnaldo Carvalho de Melo authored
       commit f7aa222f
       Author: Arnaldo Carvalho de Melo <acme@redhat.com>
       Date:   Tue Feb 3 13:25:39 2015 -0300
      
          perf trace: No need to enable evsels for workload started from perf
      
      The assumption was that whenever a workload is specified, the
      attr.enable_on_exec evsel flag would be set, but that is not happening
      when perf_record_opts.system_wide is set, for instance
      
      That resulted in both perf_evlist__enable() and attr.enable_on_exec
      being not called/set, which made the events to remain disabled while the
      workload runs, producing no output.
      
      Fix it,  by calling perf_evlist__enable() in the 'trace' tool
      when forking and not targetting a workload started from trace
      
      v2: Test against !target__none(), as suggested by Namhyung Kim, that is
      what is used in perf_evsel__config() when deciding if the
      attr.enable_on_exec flag to be set. More work is needed to cover other
      cases such as opts->initial_delay.
      Acked-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Don Zickus <dzickus@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/n/tip-27z7169pvfxgj8upic636syv@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      cb24d01d
  4. 22 Apr, 2015 3 commits
    • Sonny Rao's avatar
      perf/x86/intel/uncore: Move PCI IDs for IMC to uncore driver · 0140e614
      Sonny Rao authored
      This keeps all the related PCI IDs together in the driver where
      they are used.
      Signed-off-by: default avatarSonny Rao <sonnyrao@chromium.org>
      Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
      Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1429644791-25724-1-git-send-email-sonnyrao@chromium.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      0140e614
    • Sonny Rao's avatar
      perf/x86/intel/uncore: Add support for Intel Haswell ULT (lower power Mobile... · 80bcffb3
      Sonny Rao authored
      perf/x86/intel/uncore: Add support for Intel Haswell ULT (lower power Mobile Processor) IMC uncore PMUs
      
      This uncore is the same as the Haswell desktop part but uses a
      different PCI ID.
      Signed-off-by: default avatarSonny Rao <sonnyrao@chromium.org>
      Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
      Cc: Bjorn Helgaas <bhelgaas@google.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/1429569247-16697-1-git-send-email-sonnyrao@chromium.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      80bcffb3
    • Jiri Olsa's avatar
      perf/x86/intel: Add cpu_(prepare|starting|dying) for core_pmu · 3b6e0421
      Jiri Olsa authored
      The core_pmu does not define cpu_* callbacks, which handles
      allocation of 'struct cpu_hw_events::shared_regs' data,
      initialization of debug store and PMU_FL_EXCL_CNTRS counters.
      
      While this probably won't happen on bare metal, virtual CPU can
      define x86_pmu.extra_regs together with PMU version 1 and thus
      be using core_pmu -> using shared_regs data without it being
      allocated. That could could leave to following panic:
      
      	BUG: unable to handle kernel NULL pointer dereference at (null)
      	IP: [<ffffffff8152cd4f>] _spin_lock_irqsave+0x1f/0x40
      
      	SNIP
      
      	 [<ffffffff81024bd9>] __intel_shared_reg_get_constraints+0x69/0x1e0
      	 [<ffffffff81024deb>] intel_get_event_constraints+0x9b/0x180
      	 [<ffffffff8101e815>] x86_schedule_events+0x75/0x1d0
      	 [<ffffffff810586dc>] ? check_preempt_curr+0x7c/0x90
      	 [<ffffffff810649fe>] ? try_to_wake_up+0x24e/0x3e0
      	 [<ffffffff81064ba2>] ? default_wake_function+0x12/0x20
      	 [<ffffffff8109eb16>] ? autoremove_wake_function+0x16/0x40
      	 [<ffffffff810577e9>] ? __wake_up_common+0x59/0x90
      	 [<ffffffff811a9517>] ? __d_lookup+0xa7/0x150
      	 [<ffffffff8119db5f>] ? do_lookup+0x9f/0x230
      	 [<ffffffff811a993a>] ? dput+0x9a/0x150
      	 [<ffffffff8119c8f5>] ? path_to_nameidata+0x25/0x60
      	 [<ffffffff8119e90a>] ? __link_path_walk+0x7da/0x1000
      	 [<ffffffff8101d8f9>] ? x86_pmu_add+0xb9/0x170
      	 [<ffffffff8101d7a7>] x86_pmu_commit_txn+0x67/0xc0
      	 [<ffffffff811b07b0>] ? mntput_no_expire+0x30/0x110
      	 [<ffffffff8119c731>] ? path_put+0x31/0x40
      	 [<ffffffff8107c297>] ? current_fs_time+0x27/0x30
      	 [<ffffffff8117d170>] ? mem_cgroup_get_reclaim_stat_from_page+0x20/0x70
      	 [<ffffffff8111b7aa>] group_sched_in+0x13a/0x170
      	 [<ffffffff81014a29>] ? sched_clock+0x9/0x10
      	 [<ffffffff8111bac8>] ctx_sched_in+0x2e8/0x330
      	 [<ffffffff8111bb7b>] perf_event_sched_in+0x6b/0xb0
      	 [<ffffffff8111bc36>] perf_event_context_sched_in+0x76/0xc0
      	 [<ffffffff8111eb3b>] perf_event_comm+0x1bb/0x2e0
      	 [<ffffffff81195ee9>] set_task_comm+0x69/0x80
      	 [<ffffffff81195fe1>] setup_new_exec+0xe1/0x2e0
      	 [<ffffffff811ea68e>] load_elf_binary+0x3ce/0x1ab0
      
      Adding cpu_(prepare|starting|dying) for core_pmu to have
      shared_regs data allocated for core_pmu. AFAICS there's no harm
      to initialize debug store and PMU_FL_EXCL_CNTRS either for
      core_pmu.
      Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
      Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Stephane Eranian <eranian@google.com>
      Link: http://lkml.kernel.org/r/20150421152623.GC13169@krava.redhat.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      3b6e0421
  5. 18 Apr, 2015 1 commit
  6. 17 Apr, 2015 4 commits
  7. 14 Apr, 2015 1 commit
  8. 13 Apr, 2015 5 commits
    • He Kuang's avatar
      perf probe: Fix segfault when probe with lazy_line to file · f19e80c6
      He Kuang authored
      The first argument passed to find_probe_point_lazy() should be CU die,
      which will be passed to die_walk_lines() when lazy_line matches.
      Currently, when we probe with lazy_line pattern to file without function
      name, NULL pointer is passed and causes a segment fault.
      
      Can be reproduced as following:
      
        $ perf probe -k vmlinux --add='fs/super.c;s->s_count=1;'
        [ 1958.984658] perf[1020]: segfault at 10 ip 00007fc6e10d8c71 sp
        00007ffcbfaaf900 error 4 in libdw-0.161.so[7fc6e10ce000+34000]
        Segmentation fault
      
      After this patch:
      
        $ perf probe -k vmlinux --add='fs/super.c;s->s_count=1;'
        Added new event:
        probe:_stext         (on @fs/super.c)
      
        You can now use it in all perf tools, such as:
          perf record -e probe:_stext -aR sleep 1
      Signed-off-by: default avatarHe Kuang <hekuang@huawei.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/r/1428925290-5623-3-git-send-email-hekuang@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      f19e80c6
    • Naohiro Aota's avatar
      perf probe: Find compilation directory path for lazy matching · 09ed8975
      Naohiro Aota authored
      If we use lazy matching, it failed to open a souce file if perf command
      is invoked outside of compilation directory:
      
      $ perf probe -a '__schedule;clear_*'
      Failed to open kernel/sched/core.c: No such file or directory
        Error: Failed to add events. (-2)
      
      OTOH, other commands like "probe -L" can solve the souce directory by
      themselves. Let's make it possible for lazy matching too!
      Signed-off-by: default avatarNaohiro Aota <naota@elisp.net>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: He Kuang <hekuang@huawei.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Link: http://lkml.kernel.org/r/1426223923-1493-1-git-send-email-naota@elisp.netSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      09ed8975
    • He Kuang's avatar
      perf probe: Set retprobe flag when probe in address-based alternative mode · 9d7b45c5
      He Kuang authored
      When perf probe searched in a debuginfo file and failed, it tried with
      an alternative, in function get_alternative_probe_event():
      
              memcpy(tmp, &pev->point, sizeof(*tmp));
              memset(&pev->point, 0, sizeof(pev->point));
      
      In this case, it drops the retprobe flag and forgets to set it back in
      find_alternative_probe_point(), so the problem occurs.
      
      Can be reproduced as following:
      
        $ perf probe -v -k vmlinux --add='sys_write%return'
        ...
        Added new event:
        Writing event: p:probe/sys_write _stext+1584952
          probe:sys_write      (on sys_write%return)
      
        $ cat /sys/kernel/debug/tracing/kprobe_events
        p:probe/sys_write _stext+1584952
      
      After this patch:
      
        $ perf probe -v -k vmlinux --add='sys_write%return'
        Added new event:
        Writing event: r:probe/sys_write SyS_write+0
          probe:sys_write      (on sys_write%return)
      
        $ cat /sys/kernel/debug/tracing/kprobe_events
        r:probe/sys_write SyS_write
      Signed-off-by: default avatarHe Kuang <hekuang@huawei.com>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/r/1428925290-5623-1-git-send-email-hekuang@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      9d7b45c5
    • Namhyung Kim's avatar
      perf kmem: Analyze page allocator events also · 0d68bc92
      Namhyung Kim authored
      The perf kmem command records and analyze kernel memory allocation only
      for SLAB objects.  This patch implement a simple page allocator analyzer
      using kmem:mm_page_alloc and kmem:mm_page_free events.
      
      It adds two new options of --slab and --page.  The --slab option is for
      analyzing SLAB allocator and that's what perf kmem currently does.
      
      The new --page option enables page allocator events and analyze kernel
      memory usage in page unit.  Currently, 'stat --alloc' subcommand is
      implemented only.
      
      If none of these --slab nor --page is specified, --slab is implied.
      
      First run 'perf kmem record' to generate a suitable perf.data file:
      
        # perf kmem record --page sleep 5
      
      Then run 'perf kmem stat' to postprocess the perf.data file:
      
        # perf kmem stat --page --alloc --line 10
      
        -------------------------------------------------------------------------------
         PFN              | Total alloc (KB) | Hits     | Order | Mig.type | GFP flags
        -------------------------------------------------------------------------------
                  4045014 |               16 |        1 |     2 |  RECLAIM |  00285250
                  4143980 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3938658 |               16 |        1 |     2 |  RECLAIM |  00285250
                  4045400 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3568708 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3729824 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3657210 |               16 |        1 |     2 |  RECLAIM |  00285250
                  4120750 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3678850 |               16 |        1 |     2 |  RECLAIM |  00285250
                  3693874 |               16 |        1 |     2 |  RECLAIM |  00285250
         ...              | ...              | ...      | ...   | ...      | ...
        -------------------------------------------------------------------------------
      
        SUMMARY (page allocator)
        ========================
        Total allocation requests     :           44,260   [          177,256 KB ]
        Total free requests           :              117   [              468 KB ]
      
        Total alloc+freed requests    :               49   [              196 KB ]
        Total alloc-only requests     :           44,211   [          177,060 KB ]
        Total free-only requests      :               68   [              272 KB ]
      
        Total allocation failures     :                0   [                0 KB ]
      
        Order     Unmovable   Reclaimable       Movable      Reserved  CMA/Isolated
        -----  ------------  ------------  ------------  ------------  ------------
            0            32             .        44,210             .             .
            1             .             .             .             .             .
            2             .            18             .             .             .
            3             .             .             .             .             .
            4             .             .             .             .             .
            5             .             .             .             .             .
            6             .             .             .             .             .
            7             .             .             .             .             .
            8             .             .             .             .             .
            9             .             .             .             .             .
           10             .             .             .             .             .
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Joonsoo Kim <js1304@gmail.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/1428298576-9785-4-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      0d68bc92
    • Namhyung Kim's avatar
      tracing, mm: Record pfn instead of pointer to struct page · 9fdd8a87
      Namhyung Kim authored
      The struct page is opaque for userspace tools, so it'd be better to save
      pfn in order to identify page frames.
      
      The textual output of $debugfs/tracing/trace file remains unchanged and
      only raw (binary) data format is changed - but thanks to libtraceevent,
      userspace tools which deal with the raw data (like perf and trace-cmd)
      can parse the format easily.  So impact on the userspace will also be
      minimal.
      Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
      Based-on-patch-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/1428298576-9785-3-git-send-email-namhyung@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      9fdd8a87
  9. 12 Apr, 2015 1 commit
  10. 11 Apr, 2015 1 commit
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo' of... · 5dafd7cb
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo' 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 user visible features:
      
        - Support multiple probes on different binaries on the same command line (Masami Hiramatsu)
      
      User visible changes:
      
        - Fix synthesizing fork_event.ppid for non-main thread (David Ahern)
      
        - Fix cross-endian analysis (David Ahern)
      
        - Fix segfault in 'perf buildid-list' when show DSOs with hits (He Kuang)
      
      Infrastructure changes:
      
        - Fix type for references to data_head/tail (David Ahern)
      
        - Fix error path to do closedir() when synthesizing threads (Arnaldo Carvalho de Melo)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      5dafd7cb
  11. 10 Apr, 2015 7 commits
  12. 08 Apr, 2015 6 commits
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo' of... · 51ab7155
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo' 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:
      
      User visible changes:
      
        - Teach 'perf record' about perf_event_attr.clockid (Peter Zijlstra)
      
        - Improve 'perf sched replay' on high CPU core count machines (Yunlong Song)
      
        - Consider PERF_RECORD_ events with cpumode == 0 in 'perf top', removing one
          cause of long term memory usage buildup, i.e. not processing PERF_RECORD_EXIT
          events (Arnaldo Carvalho de Melo)
      
        - Add 'I' event modifier for perf_event_attr.exclude_idle bit (Jiri Olsa)
      
        - Respect -i option 'in perf kmem' (Jiri Olsa)
      
      Infrastructure changes:
      
        - Honor operator priority in libtraceevent (Namhyung Kim)
      
        - Merge all perf_event_attr print functions (Peter Zijlstra)
      
        - Check kmaps access to make code more robust (Wang Nan)
      
        - Fix inverted logic in perf_mmap__empty() (He Kuang)
      
        - Fix ARM 32 'perf probe' building error (Wang Nan)
      
        - Fix perf_event_attr tests (Jiri Olsa)
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      51ab7155
    • Jiri Olsa's avatar
      perf tools: Add 'I' event modifier for exclude_idle bit · a1e12da4
      Jiri Olsa authored
      Adding 'I' event modifier to have complete set of modifiers for
      perf_event_attr:exclude_* bits.
      
      Any event specified with 'I' modifier will have the
      perf_event_attr:exclude_idle bit set.
      
        $ perf record -e cycles:I -vv ls 2>&1 | grep exclude_idle
        exclude_hv          0    exclude_idle        1
      
      Adding automated tests.
      Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: William Cohen <wcohen@redhat.com>
      Link: http://lkml.kernel.org/r/1428441919-23099-2-git-send-email-jolsa@kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      a1e12da4
    • Wang Nan's avatar
      perf report: Don't call map__kmap if map is NULL. · f6fcc143
      Wang Nan authored
      report__warn_kptr_restrict() calls map__kmap(kernel_map) before checking
      kernel_map againest NULL.
      
      Which is dangerous, since map__kmap() will return a invalid and not NULL
      address.
      
      It will trigger a warning message in map__kmap() after the patch "perf:
      kmaps: enforce usage of kmaps to protect futher bugs." was applied.
      
      This patch fixes it by adding the missing checking.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/1428490772-135393-1-git-send-email-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      f6fcc143
    • Jiri Olsa's avatar
      perf tests: Fix attr tests · 54a50f93
      Jiri Olsa authored
      Following commit:
        1a594131 perf: Add wakeup watermark control to the AUX area
      
      enlarged perf_event_attr, but did not updated attr tests.
      Reported-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Kaixu Xia <kaixu.xia@linaro.org>
      Cc: Kan Liang <kan.liang@intel.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Robert Richter <rric@kernel.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Markus T Metzger <markus.t.metzger@intel.com>
      Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
      Link: http://lkml.kernel.org/n/20150407171715.GA22603@krava.redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      54a50f93
    • Wang Nan's avatar
      perf probe: Fix ARM 32 building error · f6c15621
      Wang Nan authored
      Commit 9b118aca ("perf probe: Fix to
      handle aliased symbols in glibc") uses an absolute format '%lx' to
      print u64 argument, which causes compiling error on ARM 32.
      
      This patch replaces it with PRIx64.
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Acked-by: default avatarMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Zefan Li <lizefan@huawei.com>
      Cc: pi3orama@163.com
      Link: http://lkml.kernel.org/r/1428459274-138470-1-git-send-email-wangnan0@huawei.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      f6c15621
    • Peter Zijlstra's avatar
      perf tools: Merge all perf_event_attr print functions · 2c5e8c52
      Peter Zijlstra authored
      Currently there's 3 (that I found) different and incomplete
      implementations of printing perf_event_attr.
      
      This is quite silly. Merge the lot.
      
      While this patch does not retain the exact form all printing that I
      found is debug output and thus it should not be critical.
      
      Also, I cannot find a single print_event_desc() caller.
      
      Pre:
      
       $ perf record -vv -e cycles -- sleep 1
       ------------------------------------------------------------
       perf_event_attr:
        type                0
        size                104
        config              0
        sample_period       4000
        sample_freq         4000
        sample_type         0x107
        read_format         0
        disabled            1    inherit             1
        pinned              0    exclusive           0
        exclude_user        0    exclude_kernel      0
        exclude_hv          0    exclude_idle        0
        mmap                1    comm                1
        mmap2               1    comm_exec           1
        freq                1    inherit_stat        0
        enable_on_exec      1    task                1
        watermark           0    precise_ip          0
        mmap_data           0    sample_id_all       1
        exclude_host        0    exclude_guest       1
        excl.callchain_kern 0    excl.callchain_user 0
        wakeup_events       0
        wakeup_watermark    0
        bp_type             0
        bp_addr             0
        config1             0
        bp_len              0
        config2             0
        branch_sample_type  0
        sample_regs_user    0
        sample_stack_user   0
        sample_regs_intr    0
       ------------------------------------------------------------
      
       $ perf evlist  -vv
       cycles: sample_freq=4000, size: 104, sample_type: IP|TID|TIME|PERIOD,
       disabled: 1, inherit: 1, mmap: 1, mmap2: 1, comm: 1, comm_exec: 1,
       freq: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1
      
       Post:
      
       $ ./perf record -vv -e cycles -- sleep 1
       ------------------------------------------------------------
       perf_event_attr:
        size                             112
        { sample_period, sample_freq }   4000
        sample_type                      IP|TID|TIME|PERIOD
        disabled                         1
        inherit                          1
        mmap                             1
        comm                             1
        freq                             1
        enable_on_exec                   1
        task                             1
        sample_id_all                    1
        exclude_guest                    1
        mmap2                            1
        comm_exec                        1
      ------------------------------------------------------------
      
       $ ./perf evlist  -vv
       cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type:
       IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq:
       1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1,
       mmap2: 1, comm_exec: 1
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
      Acked-by: default avatarIngo Molnar <mingo@kernel.org>
      Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: John Stultz <john.stultz@linaro.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20150407091150.644238729@infradead.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      2c5e8c52