On Thursday 02 August 2007 19:21:18 Mel Gorman wrote:
> The NUMA layer only supports NUMA policies for the highest zone. When
> ZONE_MOVABLE is configured with kernelcore=, the the highest zone becomes
> ZONE_MOVABLE. The result is that policies are only applied to allocations
> like anonymous pages and page cache allocated from ZONE_MOVABLE when the
> zone is used.
>
> This patch applies policies to the two highest zones when the highest zone
> is ZONE_MOVABLE. As ZONE_MOVABLE consists of pages from the highest "real"
> zone, it's always functionally equivalent.
>
> The patch has been tested on a variety of machines both NUMA and non-NUMA
> covering x86, x86_64 and ppc64. No abnormal results were seen in kernbench,
> tbench, dbench or hackbench. It passes regression tests from the numactl
> package with and without kernelcore= once numactl tests are patched to
> wait for vmstat counters to update.
I must honestly say I really hate the patch. It's a horrible hack and makes fast paths
slower. When I designed mempolicies I especially tried to avoid things
like that, please don't add them through the backdoor now.
-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]
