1. 21 11月, 2009 1 次提交
    • A
      perf symbols: Do lazy symtab loading for the kernel & modules too · c338aee8
      Arnaldo Carvalho de Melo 提交于
      Just like we do with the other DSOs. This also simplifies the
      kernel_maps setup process, now all that the tools need to do is
      to call kernel_maps__init and the maps for the modules and
      kernel will be created, then, later, when
      kernel_maps__find_symbol() is used, it will also call
      maps__find_symbol that already checks if the symtab was loaded,
      loading it if needed.
      
      Now if one does 'perf top --hide_kernel_symbols' we won't pay
      the price of loading the (many) symbols in /proc/kallsyms or
      vmlinux.
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frédéric Weisbecker <fweisbec@gmail.com>
      Cc: Mike Galbraith <efault@gmx.de>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Paul Mackerras <paulus@samba.org>
      LKML-Reference: <1258757489-5978-4-git-send-email-acme@infradead.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      c338aee8
  2. 08 11月, 2009 1 次提交
    • A
      perf symbols: Use the buildids if present · 8d06367f
      Arnaldo Carvalho de Melo 提交于
      With this change 'perf record' will intercept PERF_RECORD_MMAP
      calls, creating a linked list of DSOs, then when the session
      finishes, it will traverse this list and read the buildids,
      stashing them at the end of the file and will set up a new
      feature bit in the header bitmask.
      
      'perf report' will then notice this feature and populate the
      'dsos' list and set the build ids.
      
      When reading the symtabs it will refuse to load from a file that
      doesn't have the same build id. This improves the
      reliability of the profiler output, as symbols and profiling
      data is more guaranteed to match.
      
      Example:
      
       [root@doppio ~]# perf report | head
       /home/acme/bin/perf with build id b1ea544ac3746e7538972548a09aadecc5753868 not found, continuing without symbols
        # Samples: 2621434559
        #
        # Overhead          Command                  Shared Object  Symbol
        # ........  ...............  .............................  ......
        #
             7.91%             init  [kernel]        [k] read_hpet
             7.64%             init  [kernel]        [k] mwait_idle_with_hints
             7.60%          swapper  [kernel]        [k] read_hpet
             7.60%          swapper  [kernel]        [k] mwait_idle_with_hints
             3.65%             init  [kernel]        [k] 0xffffffffa02339d9
      [root@doppio ~]#
      
      In this case the 'perf' binary was an older one, vanished,
      so its symbols probably wouldn't match or would cause subtly
      different (and misleading) output.
      
      Next patches will support the kernel as well, reading the build
      id notes for it and the modules from /sys.
      
      Another patch should also introduce a new plumbing command:
      
      'perf list-buildids'
      
      that will then be used in porcelain that is distro specific to
      fetch -debuginfo packages where such buildids are present. This
      will in turn allow for one to run 'perf record' in one machine
      and 'perf report' in another.
      
      Future work on having the buildid sent directly from the kernel
      in the PERF_RECORD_MMAP event is needed to close races, as the
      DSO can be changed during a 'perf record' session, but this
      patch at least helps with non-corner cases and current/older
      kernels.
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Frank Ch. Eigler <fche@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Jason Baron <jbaron@redhat.com>
      Cc: Jim Keniston <jkenisto@us.ibm.com>
      Cc: K. Prasad <prasad@linux.vnet.ibm.com>
      Cc: Masami Hiramatsu <mhiramat@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Roland McGrath <roland@redhat.com>
      Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      LKML-Reference: <1257367843-26224-1-git-send-email-acme@infradead.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      8d06367f
  3. 03 11月, 2009 1 次提交
    • I
      perf tools: Fix missing symtabs printouts · 900b20d5
      Ingo Molnar 提交于
      Fix:
      
        util/map.c: In function ‘map__find_symbol’:
        util/map.c:97: error: field precision should have type ‘int’, but argument 3 has type ‘size_t’
      
      Also clean up some line wrap damage - we dont line-wrap printk
      messages.
      
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Mike Galbraith <efault@gmx.de>
      LKML-Reference: <1256927305-4628-3-git-send-email-acme@infradead.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      900b20d5
  4. 02 11月, 2009 3 次提交
  5. 29 10月, 2009 1 次提交
  6. 23 10月, 2009 1 次提交
    • A
      perf tools: Unify debug messages mechanisms · 6beba7ad
      Arnaldo Carvalho de Melo 提交于
      We were using eprintf in some places, that looks at a global
      'verbose' level, and at other places passing a 'v' parameter to
      specify the verbosity level, unify it by introducing
      pr_{err,warning,debug,etc}, just like in the kernel.
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Mike Galbraith <efault@gmx.de>
      LKML-Reference: <1256153646-10097-1-git-send-email-acme@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      6beba7ad
  7. 21 10月, 2009 1 次提交
  8. 20 10月, 2009 1 次提交
    • A
      perf tools: Add ->unmap_ip operation to struct map · ed52ce2e
      Arnaldo Carvalho de Melo 提交于
      We need this because we get section relative addresses when
      reading the symtabs, but when a tool like 'perf annotate' needs
      to match these address to what 'objdump -dS' produces we need
      the address + section back again.
      
      So in annotate now we look at the 'struct hist_entry' instances
      (that weren't really being used) so that we iterate only over
      the symbols that had some hit and get the map where that
      particular hit happened so that we can get the right address to
      match with annotate.
      
      Verified that at least:
      
       perf annotate mmap_read_counter # Uses the ~/bin/perf binary
       perf annotate --vmlinux /home/acme/git/build/perf/vmlinux intel_pmu_enable_all
      
      on a 'perf record perf top' session seems to work.
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Mike Galbraith <efault@gmx.de>
      LKML-Reference: <1255979877-12533-1-git-send-email-acme@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      ed52ce2e
  9. 12 8月, 2009 1 次提交