diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | arch/x86/oprofile/nmi_int.c | 27 |
2 files changed, 24 insertions, 6 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 854ed5ca7e3..f7735a125f4 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1848,6 +1848,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. arch_perfmon: [X86] Force use of architectural perfmon on Intel CPUs instead of the CPU specific event set. + timer: [X86] Force use of architectural NMI + timer mode (see also oprofile.timer + for generic hr timer mode) oops=panic Always panic on oopses. Default is to just kill the process, but there is a small probability of diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c index 68894fdc034..7ca4d43e898 100644 --- a/arch/x86/oprofile/nmi_int.c +++ b/arch/x86/oprofile/nmi_int.c @@ -613,24 +613,36 @@ static int __init p4_init(char **cpu_type) return 0; } -static int force_arch_perfmon; -static int force_cpu_type(const char *str, struct kernel_param *kp) +enum __force_cpu_type { + reserved = 0, /* do not force */ + timer, + arch_perfmon, +}; + +static int force_cpu_type; + +static int set_cpu_type(const char *str, struct kernel_param *kp) { - if (!strcmp(str, "arch_perfmon")) { - force_arch_perfmon = 1; + if (!strcmp(str, "timer")) { + force_cpu_type = timer; + printk(KERN_INFO "oprofile: forcing NMI timer mode\n"); + } else if (!strcmp(str, "arch_perfmon")) { + force_cpu_type = arch_perfmon; printk(KERN_INFO "oprofile: forcing architectural perfmon\n"); + } else { + force_cpu_type = 0; } return 0; } -module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0); +module_param_call(cpu_type, set_cpu_type, NULL, NULL, 0); static int __init ppro_init(char **cpu_type) { __u8 cpu_model = boot_cpu_data.x86_model; struct op_x86_model_spec *spec = &op_ppro_spec; /* default */ - if (force_arch_perfmon && cpu_has_arch_perfmon) + if (force_cpu_type == arch_perfmon && cpu_has_arch_perfmon) return 0; /* @@ -697,6 +709,9 @@ int __init op_nmi_init(struct oprofile_operations *ops) if (!cpu_has_apic) return -ENODEV; + if (force_cpu_type == timer) + return -ENODEV; + switch (vendor) { case X86_VENDOR_AMD: /* Needs to be at least an Athlon (or hammer in 32bit mode) */ |