diff options
Diffstat (limited to 'init')
-rw-r--r-- | init/Kconfig | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index c52d1d48272a..35659ed442e5 100644 --- a/init/Kconfig +++ b/init/Kconfig | |||
@@ -919,6 +919,41 @@ config AIO | |||
919 | by some high performance threaded applications. Disabling | 919 | by some high performance threaded applications. Disabling |
920 | this option saves about 7k. | 920 | this option saves about 7k. |
921 | 921 | ||
922 | config HAVE_PERF_COUNTERS | ||
923 | bool | ||
924 | |||
925 | menu "Performance Counters" | ||
926 | |||
927 | config PERF_COUNTERS | ||
928 | bool "Kernel Performance Counters" | ||
929 | depends on HAVE_PERF_COUNTERS | ||
930 | default y | ||
931 | select ANON_INODES | ||
932 | help | ||
933 | Enable kernel support for performance counter hardware. | ||
934 | |||
935 | Performance counters are special hardware registers available | ||
936 | on most modern CPUs. These registers count the number of certain | ||
937 | types of hw events: such as instructions executed, cachemisses | ||
938 | suffered, or branches mis-predicted - without slowing down the | ||
939 | kernel or applications. These registers can also trigger interrupts | ||
940 | when a threshold number of events have passed - and can thus be | ||
941 | used to profile the code that runs on that CPU. | ||
942 | |||
943 | The Linux Performance Counter subsystem provides an abstraction of | ||
944 | these hardware capabilities, available via a system call. It | ||
945 | provides per task and per CPU counters, and it provides event | ||
946 | capabilities on top of those. | ||
947 | |||
948 | Say Y if unsure. | ||
949 | |||
950 | config EVENT_PROFILE | ||
951 | bool "Tracepoint profile sources" | ||
952 | depends on PERF_COUNTERS && EVENT_TRACER | ||
953 | default y | ||
954 | |||
955 | endmenu | ||
956 | |||
922 | config VM_EVENT_COUNTERS | 957 | config VM_EVENT_COUNTERS |
923 | default y | 958 | default y |
924 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED | 959 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED |