From 6c57a332901f851bd092aba7a2b4d8ef4e643829 Mon Sep 17 00:00:00 2001 From: Tony Luck Date: Thu, 7 Jan 2010 16:10:57 -0800 Subject: [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 type object). Signed-off-by: Tony Luck --- arch/ia64/kernel/mca.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'arch/ia64/kernel') 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) { -- cgit v1.2.3