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Date: Thu, 30 Oct 2008 18:45:34 +0300 From: Cyrill Gorcunov <gorcunov@...il.com> To: Aristeu Rozanski <aris@...hat.com> Cc: "Maciej W. Rozycki" <macro@...ux-mips.org>, Randy Dunlap <randy.dunlap@...cle.com>, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu> Subject: Re: [PATCH] nmi_watchdog: update procfs nmi_watchdog file documentation [Aristeu Rozanski - Thu, Oct 30, 2008 at 11:17:14AM -0400] | This patch updates the /proc/sys/kernel/nmi_watchdog documentation. | | Signed-off-by: Aristeu Rozanski <aris@...hat.com> | | --- | Documentation/filesystems/proc.txt | 13 ++++++++----- | Documentation/nmi_watchdog.txt | 5 +++++ | 2 files changed, 13 insertions(+), 5 deletions(-) | | --- linus-2.6.orig/Documentation/nmi_watchdog.txt 2008-10-24 11:41:30.000000000 -0400 | +++ linus-2.6/Documentation/nmi_watchdog.txt 2008-10-29 16:38:12.000000000 -0400 | @@ -69,6 +69,11 @@ to the overall system performance. | On x86 nmi_watchdog is disabled by default so you have to enable it with | a boot time parameter. | | +It's possible to disable the NMI watchdog in run-time by writing "0" to | +/proc/sys/kernel/nmi_watchdog. Writing "1" to the same file will re-enable | +the NMI watchdog. Notice that you still need to use "nmi_watchdog=" parameter | +in boot time. | + | NOTE: In kernels prior to 2.4.2-ac18 the NMI-oopser is enabled unconditionally | on x86 SMP boxes. | | --- linus-2.6.orig/Documentation/filesystems/proc.txt 2008-10-24 11:41:28.000000000 -0400 | +++ linus-2.6/Documentation/filesystems/proc.txt 2008-10-30 11:16:36.000000000 -0400 | @@ -1336,12 +1336,15 @@ panic controls already in that directory | nmi_watchdog | ------------ | | -Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero | +Enables/Disables the NMI watchdog on x86 systems. When the value is non-zero | the NMI watchdog is enabled and will continuously test all online cpus to | -determine whether or not they are still functioning properly. | - | -Because the NMI watchdog shares registers with oprofile, by disabling the NMI | -watchdog, oprofile may have more registers to utilize. | +determine whether or not they are still functioning properly. Currently, | +passing "nmi_watchdog=" parameter in boot time is required for this function | +to work. | + | +If LAPIC NMI watchdog method is in use (nmi_watchdog=2 kernel parameter), the | +NMI watchdog shares registers with oprofile, by disabling the NMI watchdog, | +oprofile may have more registers to utilize. | | msgmni | ------ | Hi Aristeu, by reading this patch I found that maybe it's time to start using nmi_watchdog=[lapic,ioapic] instead of 1 and 2? We could make them as alases to existing numbers. Thoughts? - Cyrill - -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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