Skip to content

cloud-kernel
cloud-kernel

openanolis / cloud-kernel
1 年多 前同步成功

通知 160
Star 36
Fork 7
cloud-kernel
cloud-kernel
切换分支/标签
  1. 18 12月, 2015 30 次提交
  3. 17 12月, 2015 5 次提交
  5. 15 12月, 2015 2 次提交
    • N
      perf record: Add record.build-id config option · 7a29c087
      由 Namhyung Kim 提交于 
      Post processing at 'perf record' takes a long time on big machines.

What it does is to find the build-id of binaries found in the event
stream, so that it can make sure, at 'report' time, that the symtabs (be
it ELF, kallsyms, etc) being used to resolve symbols are the ones
matching the binaries found at 'record' time.

Sometimes we just want to skip this processing of events at the end of
the session to get quicker results, making sure the binaries haven't
changed from 'record' to 'report' time.

Add a new config option to control this behavior.

The record.build-id config variable can have one of the following
values:

 - cache: post-process data and save/update the binaries into the
          build-id cache (in ~/.debug).  This is the default.
 - no-cache: post-process the data but not update the build-id cache.
             Same effect as using the -N option.
 - skip: skip post-processing and do not update the cache.
         Same effect as using the -B option.
Reported-and-Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NNamhyung Kim <namhyung@kernel.org>
Acked-by: NJiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Taeung Song <treeze.taeung@gmail.com>
Link: http://lkml.kernel.org/r/1450144196-22957-1-git-send-email-namhyung@kernel.org
[ Added some more text to the documentation ]
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      7a29c087
    • H
      perf record: Support custom vmlinux path · 7efe0e03
      由 He Kuang 提交于 
      Make perf-record command support --vmlinux option if BPF_PROLOGUE is on.

'perf record' needs vmlinux as the source of DWARF info to generate
prologue for BPF programs, so path of vmlinux should be specified.

Short name 'k' has been taken by 'clockid'. This patch skips the short
option name and uses '--vmlinux' for vmlinux path.

Documentation is also updated.

Test result:

In a production (or broken) environment:
 (by:
  # rm -rf ~/.debug/
  # mv /lib/modules/`uname -r`/build/vmlinux /tmp/
 )

 # ./perf record -e ./test_bpf_base.c ls
 Failed to find the path for kernel: No such file or directory
 event syntax error: './test_bpf_base.c'
                      \___ You need to check probing points in BPF file
 ...

 # ./perf record --vmlinux /tmp/vmlinux -e ./test_bpf_base.c ls
 ...
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.011 MB perf.data ]

Help messages when build with NO_LIBBPF:

 # ./perf record -h
        --transaction     sample transaction flags (special events only)
        --vmlinux <file>  vmlinux pathname
                          (not built-in because NO_LIBBPF=1)
 # ./perf record --vmlinux /tmp/vmlinux ls /
  Warning: option `vmlinux' is being ignored because NO_LIBBPF=1
 ...
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.011 MB perf.data (11 samples) ]

Help messages when build with NO_DWARF:

 # ./perf record -h
        --transaction     sample transaction flags (special events only)
        --vmlinux <file>  vmlinux pathname
                          (not built-in because NO_DWARF=1)
Signed-off-by: NHe Kuang <hekuang@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1450089563-122430-15-git-send-email-wangnan0@huawei.comSigned-off-by: NWang Nan <wangnan0@huawei.com>
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      7efe0e03
  7. 14 12月, 2015 3 次提交
    • W
      perf tools: Make options always available, even if required libs not linked · 48e1cab1
      由 Wang Nan 提交于 
      This patch keeps options of perf builtins same in all conditions. If
one option is disabled because of compiling options, users should be
notified.

Masami suggested another implementation in [1] that, by adding a
OPTION_NEXT_DEPENDS option before those options in the 'struct option'
array, options parser knows an option is disabled. However, in some
cases this array is reordered (options__order()). In addition, in
parse-option.c that array is const, so we can't simply merge
information in decorator option into the affacted option.

This patch chooses a simpler implementation that, introducing a
set_option_nobuild() function and two option parsing flags. Builtins
with such options should call set_option_nobuild() before option
parsing. The complexity of this patch is because we want some of options
can be skipped safely. In this case their arguments should also be
consumed.

Options in 'perf record' and 'perf probe' are fixed in this patch.

[1] http://lkml.kernel.org/g/50399556C9727B4D88A595C8584AAB3752627CD4@GSjpTKYDCembx32.service.hitachi.net

Test result:

Normal case:

  # ./perf probe --vmlinux /tmp/vmlinux sys_write
  Added new event:
    probe:sys_write      (on sys_write)

  You can now use it in all perf tools, such as:

	perf record -e probe:sys_write -aR sleep 1

Build with NO_DWARF=1:

  # ./perf probe -L sys_write
    Error: switch `L' is not available because NO_DWARF=1

   Usage: perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]
      or: perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]
      or: perf probe [<options>] --del '[GROUP:]EVENT' ...
      or: perf probe --list [GROUP:]EVENT ...
      or: perf probe [<options>] --funcs

    -L, --line <FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]>
                          Show source code lines.
                          (not built-in because NO_DWARF=1)

  # ./perf probe -k /tmp/vmlinux sys_write
    Warning: switch `k' is being ignored because NO_DWARF=1
  Added new event:
    probe:sys_write      (on sys_write)

  You can now use it in all perf tools, such as:

	perf record -e probe:sys_write -aR sleep 1

  # ./perf probe --vmlinux /tmp/vmlinux sys_write
    Warning: option `vmlinux' is being ignored because NO_DWARF=1
  Added new event:
  [SNIP]

  # ./perf probe -l
   Usage: perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]
      or: perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]
...
    -k, --vmlinux <file>  vmlinux pathname
                          (not built-in because NO_DWARF=1)
    -L, --line <FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]>
                          Show source code lines.
                          (not built-in because NO_DWARF=1)
...
    -V, --vars <FUNC[@src][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT>
                          Show accessible variables on PROBEDEF
                          (not built-in because NO_DWARF=1)
        --externs         Show external variables too (with --vars only)
                          (not built-in because NO_DWARF=1)
        --no-inlines      Don't search inlined functions
                          (not built-in because NO_DWARF=1)
        --range           Show variables location range in scope (with --vars only)
                          (not built-in because NO_DWARF=1)
Signed-off-by: NWang Nan <wangnan0@huawei.com>
Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1450089563-122430-14-git-send-email-wangnan0@huawei.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      48e1cab1
    • J
      perf tools: Convert parse-options.c internal functions to static · 408cf34c
      由 Josh Poimboeuf 提交于 
      Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/c027b5f47ec1055077f5650edb1c7ad37c191e6c.1449965119.git.jpoimboe@redhat.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      408cf34c
    • J
      perf tools: Move help_unknown_cmd() to its own file · 5feaac24
      由 Josh Poimboeuf 提交于 
      help_unknown_cmd() is quite perf-specific because it relies on some
perf_config*() functions.  Move it and its supporting functions out into
a separate file so that help.c can be moved to a library.
Signed-off-by: NJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/562d918bcaaf340c1ae3e47586b3f0ae33b9918b.1449965119.git.jpoimboe@redhat.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      5feaac24