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MIPS: Loongson: Add support for perf tool 

In order to use perf tool on the Loongson platform, we should enable kernel
support for various performance events provided by software and hardware,
so add CONFIG_PERF_EVENTS=y to loongson3_defconfig.

E.g. without this patch:

[loongson@localhost perf]$ ./perf list

List of pre-defined events (to be used in -e):

  duration_time                                      [Tool event]

  rNNN                                               [Raw hardware event descriptor]
  cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event descriptor]
   (see 'man perf-list' on how to encode it)

  mem:<addr>[/len][:access]                          [Hardware breakpoint]

With this patch:

[loongson@localhost perf]$ ./perf list

List of pre-defined events (to be used in -e):

  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]

  alignment-faults                                   [Software event]
  bpf-output                                         [Software event]
  context-switches OR cs                             [Software event]
  cpu-clock                                          [Software event]
  cpu-migrations OR migrations                       [Software event]
  dummy                                              [Software event]
  emulation-faults                                   [Software event]
  major-faults                                       [Software event]
  minor-faults                                       [Software event]
  page-faults OR faults                              [Software event]
  task-clock                                         [Software event]

  duration_time                                      [Tool event]

  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  dTLB-store-misses                                  [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]

  rNNN                                               [Raw hardware event descriptor]
  cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event descriptor]
   (see 'man perf-list' on how to encode it)

  mem:<addr>[/len][:access]                          [Hardware breakpoint]

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Tiezhu Yang 2020-04-26 17:30:45 +08:00 committed by Thomas Bogendoerfer
parent a44f83092d
commit e2e13925ff
1 changed files with 1 additions and 0 deletions
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1
arch/mips/configs/loongson3_defconfig
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@ -21,6 +21,7 @@ CONFIG_SYSFS_DEPRECATED=y
CONFIG_RELAY=y
CONFIG_BLK_DEV_INITRD=y
CONFIG_EMBEDDED=y
CONFIG_PERF_EVENTS=y
CONFIG_MACH_LOONGSON64=y
CONFIG_SMP=y
CONFIG_HZ_256=y