Messages in this thread | | | Date | Thu, 30 Oct 2008 10:13:47 -0700 | From | Randy Dunlap <> | Subject | Re: [PATCH] nmi_watchdog: update procfs nmi_watchdog file documentation v2 |
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Aristeu Rozanski wrote: > This patch updates the /proc/sys/kernel/nmi_watchdog documentation. > Updated: included Randy Dunlap's corrections. > > Signed-off-by: Aristeu Rozanski <aris@redhat.com> > > --- > Documentation/filesystems/proc.txt | 11 +++++++---- > Documentation/nmi_watchdog.txt | 5 +++++ > 2 files changed, 12 insertions(+), 4 deletions(-) > > --- linus-2.6.orig/Documentation/nmi_watchdog.txt 2008-10-24 11:41:30.000000000 -0400 > +++ linus-2.6/Documentation/nmi_watchdog.txt 2008-10-30 13:05:46.000000000 -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 > +at 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 13:05:31.000000000 -0400 > @@ -1338,10 +1338,13 @@ nmi_watchdog > > 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 at 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 > ------
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Thanks.
-- ~Randy
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