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[IA64] __per_cpu_idtrs[] is a memory hog

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__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>
This commit is contained in:
Tony Luck
2010-01-07 16:10:57 -08:00
parent 410dc0aac6
commit 6c57a33290
3 changed files with 24 additions and 15 deletions
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5
arch/ia64/kernel/mca.c
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@@ -1225,9 +1225,12 @@ static void mca_insert_tr(u64 iord)
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) {