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| author | Robert Richter <robert.richter@amd.com> | 2011-10-11 17:11:08 +0200 |
|---|---|---|
| committer | Robert Richter <robert.richter@amd.com> | 2011-11-04 16:27:18 +0100 |
| commit | dcfce4a095932e6e95d83ad982be3609947963bc (patch) | |
| tree | 2808b7cbdb57deab25cc1cd847fd0f9ffa058f92 /arch/Kconfig | |
| parent | 75c43a20b220f885c39ffa7cdbbb1191e257a9a9 (diff) | |
| download | lwn-dcfce4a095932e6e95d83ad982be3609947963bc.tar.gz lwn-dcfce4a095932e6e95d83ad982be3609947963bc.zip | |
oprofile, x86: Reimplement nmi timer mode using perf event
The legacy x86 nmi watchdog code was removed with the implementation
of the perf based nmi watchdog. This broke Oprofile's nmi timer
mode. To run nmi timer mode we relied on a continuous ticking nmi
source which the nmi watchdog provided. The nmi tick was no longer
available and current watchdog can not be used anymore since it runs
with very long periods in the range of seconds. This patch
reimplements the nmi timer mode using a perf counter nmi source.
V2:
* removing pr_info()
* fix undefined reference to `__udivdi3' for 32 bit build
* fix section mismatch of .cpuinit.data:nmi_timer_cpu_nb
* removed nmi timer setup in arch/x86
* implemented function stubs for op_nmi_init/exit()
* made code more readable in oprofile_init()
V3:
* fix architectural initialization in oprofile_init()
* fix CONFIG_OPROFILE_NMI_TIMER dependencies
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch/Kconfig')
| -rw-r--r-- | arch/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 4b0669cbb3b0..2505740b81d2 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -30,6 +30,10 @@ config OPROFILE_EVENT_MULTIPLEX config HAVE_OPROFILE bool +config OPROFILE_NMI_TIMER + def_bool y + depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI + config KPROBES bool "Kprobes" depends on MODULES |