On Tue, Dec 06, 2005 at 09:24:44AM -0800, Christoph Lameter wrote:
> Zone reclaim allows the reclaiming of pages from a zone if the number of free
> pages falls below the watermark even if other zones still have enough pages
> available. Zone reclaim is of particular importance for NUMA machines. It can
> be more beneficial to reclaim a page than taking the performance penalties
> that come with allocating a page on a remote zone.
>
> The patch replaces Martin Hick's zone reclaim function (which was never
> working properly).
>
> An arch can control zone_reclaim by setting zone_reclaim_mode during bootup
> if it is discovered that the kernel is running on an NUMA configuration.
Looks much better. Thanks. But how about auto controlling the variable in generic
code based on node_distance() (at least for the non node hotplug case)
> +/*
> + * Zone reclaim mode
> + *
> + * If non-zero call zone_reclaim when the number of free pages falls below
> + * the watermarks.
> + */
> +int zone_reclaim_mode;
I would mark it __read_mostly to avoid potential false sharing.
-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
