[IA64] __per_cpu_idtrs[] is a memory hog
__per_cpu_idtrs is statically allocated ... on CONFIG_NR_CPUS=4096
systems it hogs 16MB of memory. This is way too much for a quite
probably unused facility (only KVM uses dynamic TR registers).
Change to an array of pointers, and allocate entries as needed on
a per cpu basis. Change the name too as the __per_cpu_ prefix is
confusing (this isn't a classic <linux/percpu.h> type object).
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 32f2639..378b483 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -1225,9 +1225,12 @@
unsigned long psr;
int cpu = smp_processor_id();
+ if (!ia64_idtrs[cpu])
+ return;
+
psr = ia64_clear_ic();
for (i = IA64_TR_ALLOC_BASE; i < IA64_TR_ALLOC_MAX; i++) {
- p = &__per_cpu_idtrs[cpu][iord-1][i];
+ p = ia64_idtrs[cpu] + (iord - 1) * IA64_TR_ALLOC_MAX;
if (p->pte & 0x1) {
old_rr = ia64_get_rr(p->ifa);
if (old_rr != p->rr) {