Hi, Entries in the kernel-parameters.txt file should be kept in alphabetical order mostly (there are a few exceptions where related options are kept together). On 9/15/20 11:05 AM, Alex Kogan wrote: > Keep track of the time the thread at the head of the secondary queue > has been waiting, and force inter-node handoff once this time passes > a preset threshold. The default value for the threshold (10ms) can be > overridden with the new kernel boot command-line option > "numa_spinlock_threshold". The ms value is translated internally to the > nearest rounded-up jiffies. > > Signed-off-by: Alex Kogan <alex.kogan@xxxxxxxxxx> > Reviewed-by: Steve Sistare <steven.sistare@xxxxxxxxxx> > Reviewed-by: Waiman Long <longman@xxxxxxxxxx> > --- > .../admin-guide/kernel-parameters.txt | 9 ++ > kernel/locking/qspinlock_cna.h | 95 ++++++++++++++++--- > 2 files changed, 92 insertions(+), 12 deletions(-) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 51ce050f8701..73ab23a47b97 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -3363,6 +3363,15 @@ > Not specifying this option is equivalent to > numa_spinlock=auto. > > + numa_spinlock_threshold= [NUMA, PV_OPS] > + Set the time threshold in milliseconds for the > + number of intra-node lock hand-offs before the > + NUMA-aware spinlock is forced to be passed to > + a thread on another NUMA node. Valid values > + are in the [1..100] range. Smaller values result > + in a more fair, but less performant spinlock, > + and vice versa. The default value is 10. > + > cpu0_hotplug [X86] Turn on CPU0 hotplug feature when > CONFIG_BOOTPARAM_HOTPLUG_CPU0 is off. > Some features depend on CPU0. Known dependencies are: This new entry and numa_spinlock from patch 3/5 should go between these other 2 NUMA entries: numa_balancing= [KNL,X86] Enable or disable automatic NUMA balancing. Allowed values are enable and disable numa_zonelist_order= [KNL, BOOT] Select zonelist order for NUMA. 'node', 'default' can be specified This can be set from sysctl after boot. See Documentation/admin-guide/sysctl/vm.rst for details. Oooh, that cpu0_hotplug entry is way out of place. I'll send a patch for that. thanks. -- ~Randy
