[IA64] Percpu quicklist for combined allocator for pgd/pmd/pte.

This patch introduces using the quicklists for pgd, pmd, and pte levels
by combining the alloc and free functions into a common set of routines.
This greatly simplifies the reading of this header file.

This patch is simple but necessary for large numa configurations.
It simply ensures that only pages from the local node are added to a
cpus quicklist.  This prevents the trapping of pages on a remote nodes
quicklist by starting a process, touching a large number of pages to
fill pmd and pte entries, migrating to another node, and then unmapping
or exiting.  With those conditions, the pages get trapped and if the
machine has more than 100 nodes of the same size, the calculation of
the pgtable high water mark will be larger than any single node so page
table cache flushing will never occur.

I ran lmbench lat_proc fork and lat_proc exec on a zx1 with and without
this patch and did not notice any change.

On an sn2 machine, there was a slight improvement which is possibly
due to pages from other nodes trapped on the test node before starting
the run.  I did not investigate further.

This patch shrinks the quicklist based upon free memory on the node
instead of the high/low water marks.  I have written it to enable
preemption periodically and recalculate the amount to shrink every time
we have freed enough pages that the quicklist size should have grown.
I rescan the nodes zones each pass because other processess may be
draining node memory at the same time as we are adding.

Signed-off-by: Robin Holt <holt@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/include/asm-ia64/processor.h b/include/asm-ia64/processor.h
index 2807f8d766d4..983798ec1791 100644
--- a/include/asm-ia64/processor.h
+++ b/include/asm-ia64/processor.h
@@ -137,9 +137,6 @@ struct cpuinfo_ia64 {
         __u64 nsec_per_cyc;     /* (1000000000<<IA64_NSEC_PER_CYC_SHIFT)/itc_freq */
         __u64 unimpl_va_mask;   /* mask of unimplemented virtual address bits (from PAL) */
         __u64 unimpl_pa_mask;   /* mask of unimplemented physical address bits (from PAL) */
-        __u64 *pgd_quick;
-        __u64 *pmd_quick;
-        __u64 pgtable_cache_sz;
         __u64 itc_freq;         /* frequency of ITC counter */
         __u64 proc_freq;        /* frequency of processor */
         __u64 cyc_per_usec;     /* itc_freq/1000000 */