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author | Don Zickus <dzickus@redhat.com> | 2006-09-26 10:52:27 +0200 |
---|---|---|
committer | Andi Kleen <andi@basil.nowhere.org> | 2006-09-26 10:52:27 +0200 |
commit | e33e89ab1a8d295de0500b697f4f31c3ceee9aa2 (patch) | |
tree | 51a7955a1a67f65169278a97d3d54305cb18e8ae /arch | |
parent | 407984f1af259b31957c7c05075a454a751bb801 (diff) | |
download | kernel_samsung_espresso10-e33e89ab1a8d295de0500b697f4f31c3ceee9aa2.zip kernel_samsung_espresso10-e33e89ab1a8d295de0500b697f4f31c3ceee9aa2.tar.gz kernel_samsung_espresso10-e33e89ab1a8d295de0500b697f4f31c3ceee9aa2.tar.bz2 |
[PATCH] x86: Add abilty to enable/disable nmi watchdog from procfs (update)
Adds a new /proc/sys/kernel/nmi_watchdog call that will enable/disable the
nmi watchdog.
By entering a non-zero value here, a user can enable the nmi watchdog to
monitor the online cpus in the system. By entering a zero value here, a
user can disable the nmi watchdog and free up a performance counter which
could then be utilized by the oprofile subsystem, otherwise oprofile may be
short a counter when in use.
Signed-off-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/i386/kernel/nmi.c | 21 | ||||
-rw-r--r-- | arch/x86_64/kernel/nmi.c | 21 |
2 files changed, 8 insertions, 34 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index 28065d0..6241e44 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -847,7 +847,7 @@ static int unknown_nmi_panic_callback(struct pt_regs *regs, int cpu) } /* - * proc handler for /proc/sys/kernel/nmi_watchdog + * proc handler for /proc/sys/kernel/nmi */ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, void __user *buffer, size_t *length, loff_t *ppos) @@ -861,8 +861,8 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, return 0; if (atomic_read(&nmi_active) < 0) { - printk(KERN_WARNING "NMI watchdog is permanently disabled\n"); - return -EINVAL; + printk( KERN_WARNING "NMI watchdog is permanently disabled\n"); + return -EIO; } if (nmi_watchdog == NMI_DEFAULT) { @@ -872,24 +872,11 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, nmi_watchdog = NMI_IO_APIC; } - if (nmi_watchdog == NMI_LOCAL_APIC) - { + if (nmi_watchdog == NMI_LOCAL_APIC) { if (nmi_watchdog_enabled) enable_lapic_nmi_watchdog(); else disable_lapic_nmi_watchdog(); - } else if (nmi_watchdog == NMI_IO_APIC) { - /* FIXME - * for some reason these functions don't work - */ - printk("Can not enable/disable NMI on IO APIC\n"); - return -EINVAL; -#if 0 - if (nmi_watchdog_enabled) - enable_timer_nmi_watchdog(); - else - disable_timer_nmi_watchdog(); -#endif } else { printk( KERN_WARNING "NMI watchdog doesn't know what hardware to touch\n"); diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index 3a17411..dd57410 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -167,7 +167,7 @@ static __cpuinit inline int nmi_known_cpu(void) } /* Run after command line and cpu_init init, but before all other checks */ -void __cpuinit nmi_watchdog_default(void) +void nmi_watchdog_default(void) { if (nmi_watchdog != NMI_DEFAULT) return; @@ -766,32 +766,19 @@ int proc_nmi_enabled(struct ctl_table *table, int write, struct file *file, if (atomic_read(&nmi_active) < 0) { printk( KERN_WARNING "NMI watchdog is permanently disabled\n"); - return -EINVAL; + return -EIO; } /* if nmi_watchdog is not set yet, then set it */ nmi_watchdog_default(); - if (nmi_watchdog == NMI_LOCAL_APIC) - { + if (nmi_watchdog == NMI_LOCAL_APIC) { if (nmi_watchdog_enabled) enable_lapic_nmi_watchdog(); else disable_lapic_nmi_watchdog(); - } else if (nmi_watchdog == NMI_IO_APIC) { - /* FIXME - * for some reason these functions don't work - */ - printk("Can not enable/disable NMI on IO APIC\n"); - return -EIO; -#if 0 - if (nmi_watchdog_enabled) - enable_timer_nmi_watchdog(); - else - disable_timer_nmi_watchdog(); -#endif } else { - printk(KERN_WARNING + printk( KERN_WARNING "NMI watchdog doesn't know what hardware to touch\n"); return -EIO; } |