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x86: avoid re-loading LDT in unrelated address spaces

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Performance optimization.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jan Beulich 2008-05-12 15:44:39 +02:00 committed by Thomas Gleixner
parent 78b58e549a
commit b478458aee
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/ldt.c
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@ -20,9 +20,9 @@
#include <asm/mmu_context.h> #include <asm/mmu_context.h>
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
static void flush_ldt(void *null) static void flush_ldt(void *current_mm)
{ {
if (current->active_mm) if (current->active_mm == current_mm)
load_LDT(&current->active_mm->context); load_LDT(&current->active_mm->context);
} }
#endif #endif
@ -68,7 +68,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
load_LDT(pc); load_LDT(pc);
mask = cpumask_of_cpu(smp_processor_id()); mask = cpumask_of_cpu(smp_processor_id());
if (!cpus_equal(current->mm->cpu_vm_mask, mask)) if (!cpus_equal(current->mm->cpu_vm_mask, mask))
smp_call_function(flush_ldt, NULL, 1, 1); smp_call_function(flush_ldt, current->mm, 1, 1);
preempt_enable(); preempt_enable();
#else #else
load_LDT(pc); load_LDT(pc);