| Kconfig (e87a3dd33eab30b4db539500064a9584867e4f2c) | Kconfig (dd77038d233d106f297b907bf51459dfb1099eb1) |
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| 1config ARCH 2 string 3 option env="ARCH" 4 5config KERNELVERSION 6 string 7 option env="KERNELVERSION" 8 --- 907 unchanged lines hidden (view full) --- 916 by some high performance threaded applications. Disabling 917 this option saves about 7k. 918 919config HAVE_PERF_EVENTS 920 bool 921 help 922 See tools/perf/design.txt for details. 923 | 1config ARCH 2 string 3 option env="ARCH" 4 5config KERNELVERSION 6 string 7 option env="KERNELVERSION" 8 --- 907 unchanged lines hidden (view full) --- 916 by some high performance threaded applications. Disabling 917 this option saves about 7k. 918 919config HAVE_PERF_EVENTS 920 bool 921 help 922 See tools/perf/design.txt for details. 923 |
| 924config PERF_USE_VMALLOC 925 bool 926 help 927 See tools/perf/design.txt for details 928 |
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| 924menu "Kernel Performance Events And Counters" 925 926config PERF_EVENTS 927 bool "Kernel performance events and counters" 928 default y if (PROFILING || PERF_COUNTERS) 929 depends on HAVE_PERF_EVENTS 930 select ANON_INODES 931 help 932 Enable kernel support for various performance events provided 933 by software and hardware. 934 | 929menu "Kernel Performance Events And Counters" 930 931config PERF_EVENTS 932 bool "Kernel performance events and counters" 933 default y if (PROFILING || PERF_COUNTERS) 934 depends on HAVE_PERF_EVENTS 935 select ANON_INODES 936 help 937 Enable kernel support for various performance events provided 938 by software and hardware. 939 |
| 935 Software events are supported either build-in or via the | 940 Software events are supported either built-in or via the |
| 936 use of generic tracepoints. 937 938 Most modern CPUs support performance events via performance 939 counter registers. These registers count the number of certain 940 types of hw events: such as instructions executed, cachemisses 941 suffered, or branches mis-predicted - without slowing down the 942 kernel or applications. These registers can also trigger interrupts 943 when a threshold number of events have passed - and can thus be 944 used to profile the code that runs on that CPU. 945 946 The Linux Performance Event subsystem provides an abstraction of | 941 use of generic tracepoints. 942 943 Most modern CPUs support performance events via performance 944 counter registers. These registers count the number of certain 945 types of hw events: such as instructions executed, cachemisses 946 suffered, or branches mis-predicted - without slowing down the 947 kernel or applications. These registers can also trigger interrupts 948 when a threshold number of events have passed - and can thus be 949 used to profile the code that runs on that CPU. 950 951 The Linux Performance Event subsystem provides an abstraction of |
| 947 these software and hardware cevent apabilities, available via a | 952 these software and hardware event capabilities, available via a |
| 948 system call and used by the "perf" utility in tools/perf/. It 949 provides per task and per CPU counters, and it provides event 950 capabilities on top of those. 951 952 Say Y if unsure. 953 954config EVENT_PROFILE 955 bool "Tracepoint profiling sources" --- 15 unchanged lines hidden (view full) --- 971 This config has been obsoleted by the PERF_EVENTS 972 config option - please see that one for details. 973 974 It has no effect on the kernel whether you enable 975 it or not, it is a compatibility placeholder. 976 977 Say N if unsure. 978 | 953 system call and used by the "perf" utility in tools/perf/. It 954 provides per task and per CPU counters, and it provides event 955 capabilities on top of those. 956 957 Say Y if unsure. 958 959config EVENT_PROFILE 960 bool "Tracepoint profiling sources" --- 15 unchanged lines hidden (view full) --- 976 This config has been obsoleted by the PERF_EVENTS 977 config option - please see that one for details. 978 979 It has no effect on the kernel whether you enable 980 it or not, it is a compatibility placeholder. 981 982 Say N if unsure. 983 |
| 984config DEBUG_PERF_USE_VMALLOC 985 default n 986 bool "Debug: use vmalloc to back perf mmap() buffers" 987 depends on PERF_EVENTS && DEBUG_KERNEL 988 select PERF_USE_VMALLOC 989 help 990 Use vmalloc memory to back perf mmap() buffers. 991 992 Mostly useful for debugging the vmalloc code on platforms 993 that don't require it. 994 995 Say N if unsure. 996 |
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| 979endmenu 980 981config VM_EVENT_COUNTERS 982 default y 983 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED 984 help 985 VM event counters are needed for event counts to be shown. 986 This option allows the disabling of the VM event counters --- 208 unchanged lines hidden --- | 997endmenu 998 999config VM_EVENT_COUNTERS 1000 default y 1001 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED 1002 help 1003 VM event counters are needed for event counts to be shown. 1004 This option allows the disabling of the VM event counters --- 208 unchanged lines hidden --- |