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authorDean Roe <roe@sgi.com>2005-10-27 15:41:04 -0500
committerTony Luck <tony.luck@intel.com>2005-10-27 14:44:58 -0700
commitc1902aae322952f8726469a6657df7b9d5c794fe (patch)
tree5c78f21c19597b64faf06e0faee7726ae01f7bbb /arch/ia64/mm
parent72ab373a5688a78cbdaf3bf96012e597d5399bb7 (diff)
[IA64] - Avoid slow TLB purges on SGI Altix systems
flush_tlb_all() can be a scaling issue on large SGI Altix systems since it uses the global call_lock and always executes on all cpus. When a process enters flush_tlb_range() to purge TLBs for another process, it is possible to avoid flush_tlb_all() and instead allow sn2_global_tlb_purge() to purge TLBs only where necessary. This patch modifies flush_tlb_range() so that this case can be handled by platform TLB purge functions and updates ia64_global_tlb_purge() accordingly. sn2_global_tlb_purge() now calculates the region register value from the mm argument introduced with this patch. Signed-off-by: Dean Roe <roe@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/mm')
-rw-r--r--arch/ia64/mm/tlb.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c
index 464557e4ed8..99ea8c70f40 100644
--- a/arch/ia64/mm/tlb.c
+++ b/arch/ia64/mm/tlb.c
@@ -86,10 +86,15 @@ wrap_mmu_context (struct mm_struct *mm)
}
void
-ia64_global_tlb_purge (unsigned long start, unsigned long end, unsigned long nbits)
+ia64_global_tlb_purge (struct mm_struct *mm, unsigned long start, unsigned long end, unsigned long nbits)
{
static DEFINE_SPINLOCK(ptcg_lock);
+ if (mm != current->active_mm) {
+ flush_tlb_all();
+ return;
+ }
+
/* HW requires global serialization of ptc.ga. */
spin_lock(&ptcg_lock);
{
@@ -135,15 +140,12 @@ flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long
unsigned long size = end - start;
unsigned long nbits;
+#ifndef CONFIG_SMP
if (mm != current->active_mm) {
- /* this does happen, but perhaps it's not worth optimizing for? */
-#ifdef CONFIG_SMP
- flush_tlb_all();
-#else
mm->context = 0;
-#endif
return;
}
+#endif
nbits = ia64_fls(size + 0xfff);
while (unlikely (((1UL << nbits) & purge.mask) == 0) && (nbits < purge.max_bits))
@@ -153,7 +155,7 @@ flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long
start &= ~((1UL << nbits) - 1);
# ifdef CONFIG_SMP
- platform_global_tlb_purge(start, end, nbits);
+ platform_global_tlb_purge(mm, start, end, nbits);
# else
do {
ia64_ptcl(start, (nbits<<2));