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authorTony Luck <tony.luck@intel.com>2010-01-07 16:10:57 -0800
committerTony Luck <tony.luck@intel.com>2010-01-07 16:10:57 -0800
commit6c57a332901f851bd092aba7a2b4d8ef4e643829 (patch)
tree049e913b0c7b4c678ba699ac02f62e16db8cb515 /arch/ia64/kernel/mca.c
parent410dc0aac63d1500faeabcbaecce4f4266380ed1 (diff)
[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>
Diffstat (limited to 'arch/ia64/kernel/mca.c')
-rw-r--r--arch/ia64/kernel/mca.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 32f2639e9b0a..378b4833024f 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -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) {