1. 10 Aug, 2012 5 commits
    • Jiri Olsa's avatar
      perf: Add ability to attach user stack dump to sample · c5ebcedb
      Jiri Olsa authored
      Introducing PERF_SAMPLE_STACK_USER sample type bit to trigger the dump
      of the user level stack on sample. The size of the dump is specified by
      sample_stack_user value.
      
      Being able to dump parts of the user stack, starting from the stack
      pointer, will be useful to make a post mortem dwarf CFI based stack
      unwinding.
      
      Added HAVE_PERF_USER_STACK_DUMP config option to determine if the
      architecture provides user stack dump on perf event samples.  This needs
      access to the user stack pointer which is not unified across
      architectures. Enabling this for x86 architecture.
      Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
      Original-patch-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: "Frank Ch. Eigler" <fche@redhat.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
      Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Ulrich Drepper <drepper@gmail.com>
      Link: http://lkml.kernel.org/r/1344345647-11536-6-git-send-email-jolsa@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c5ebcedb
    • Jiri Olsa's avatar
      perf: Add perf_output_skip function to skip bytes in sample · 5685e0ff
      Jiri Olsa authored
      Introducing perf_output_skip function to be able to skip data within the
      perf ring buffer.
      
      When writing data into perf ring buffer we first reserve needed place in
      ring buffer and then copy the actual data.
      
      There's a possibility we won't be able to fill all the reserved size
      with data, so we need a way to skip the remaining bytes.
      
      This is going to be useful when storing the user stack dump, where we
      might end up with less data than we originally requested.
      Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
      Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: "Frank Ch. Eigler" <fche@redhat.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
      Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Ulrich Drepper <drepper@gmail.com>
      Link: http://lkml.kernel.org/r/1344345647-11536-5-git-send-email-jolsa@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      5685e0ff
    • Frederic Weisbecker's avatar
      perf: Factor __output_copy to be usable with specific copy function · 91d7753a
      Frederic Weisbecker authored
      Adding a generic way to use __output_copy function with specific copy
      function via DEFINE_PERF_OUTPUT_COPY macro.
      
      Using this to add new __output_copy_user function, that provides output
      copy from user pointers. For x86 the copy_from_user_nmi function is used
      and __copy_from_user_inatomic for the rest of the architectures.
      
      This new function will be used in user stack dump on sample, coming in
      next patches.
      Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: "Frank Ch. Eigler" <fche@redhat.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
      Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Jiri Olsa <jolsa@redhat.com>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Ulrich Drepper <drepper@gmail.com>
      Link: http://lkml.kernel.org/r/1344345647-11536-4-git-send-email-jolsa@redhat.comSigned-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      91d7753a
    • Jiri Olsa's avatar
      perf: Add ability to attach user level registers dump to sample · 4018994f
      Jiri Olsa authored
      Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger the dump of
      user level registers on sample. Registers we want to dump are specified
      by sample_regs_user bitmask.
      
      Only user level registers are dumped at the moment. Meaning the register
      values of the user space context as it was before the user entered the
      kernel for whatever reason (syscall, irq, exception, or a PMI happening
      in userspace).
      
      The layout of the sample_regs_user bitmap is described in
      asm/perf_regs.h for archs that support register dump.
      
      This is going to be useful to bring Dwarf CFI based stack unwinding on
      top of samples.
      Original-patch-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      [ Dump registers ABI specification. ]
      Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
      Suggested-by: default avatarStephane Eranian <eranian@google.com>
      Cc: "Frank Ch. Eigler" <fche@redhat.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
      Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Ulrich Drepper <drepper@gmail.com>
      Link: http://lkml.kernel.org/r/1344345647-11536-3-git-send-email-jolsa@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      4018994f
    • Jiri Olsa's avatar
      perf: Unified API to record selective sets of arch registers · c5e63197
      Jiri Olsa authored
      This brings a new API to help the selective dump of registers on event
      sampling, and its implementation for x86 arch.
      
      Added HAVE_PERF_REGS config option to determine if the architecture
      provides perf registers ABI.
      
      The information about desired registers will be passed in u64 mask.
      It's up to the architecture to map the registers into the mask bits.
      
      For the x86 arch implementation, both 32 and 64 bit registers bits are
      defined within single enum to ensure 64 bit system can provide register
      dump for compat task if needed in the future.
      Original-patch-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      [ Added missing linux/errno.h include ]
      Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
      Cc: "Frank Ch. Eigler" <fche@redhat.com>
      Cc: Arun Sharma <asharma@fb.com>
      Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
      Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Robert Richter <robert.richter@amd.com>
      Cc: Stephane Eranian <eranian@google.com>
      Cc: Tom Zanussi <tzanussi@gmail.com>
      Cc: Ulrich Drepper <drepper@gmail.com>
      Link: http://lkml.kernel.org/r/1344345647-11536-2-git-send-email-jolsa@redhat.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      c5e63197
  2. 09 Aug, 2012 9 commits
  3. 08 Aug, 2012 18 commits
  4. 06 Aug, 2012 1 commit
  5. 05 Aug, 2012 1 commit
    • Ingo Molnar's avatar
      Merge tag 'perf-core-for-mingo' of... · 8a06bf14
      Ingo Molnar authored
      Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
      
      Pull perf/core fixes and some late updates from Arnaldo Carvalho de Melo:
      
       * Make clean brace expansion fix for some shells, from Palmer Cox
      
       * Warn user just once per guest kernel when not finding kernel info,
         from David Ahern
      
       * perf test fix from Jiri Olsa
      
       * Fix error handling on event creation in perf top, from David Ahern
      
       * Fix check on perf_target__strnerror, from Namhyung Kim
      
       * Save the whole cmdline, from David Ahern
      
       * Prep work for the DWARF CFI post unwinder, so that it doesn't
         uses perf_session in lots of places, just evlist/evsel is enough.
      Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      8a06bf14
  6. 04 Aug, 2012 6 commits