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| author | Tony Luck <tony.luck@intel.com> | 2010-01-07 16:10:57 -0800 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2010-01-07 16:10:57 -0800 |
| commit | 6c57a332901f851bd092aba7a2b4d8ef4e643829 (patch) | |
| tree | 049e913b0c7b4c678ba699ac02f62e16db8cb515 /arch/ia64/kernel/mca.c | |
| parent | 410dc0aac63d1500faeabcbaecce4f4266380ed1 (diff) | |
| download | linux-6c57a332901f851bd092aba7a2b4d8ef4e643829.tar.bz2 | |
[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.c | 5 |
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) { |