Author: marius
Date: Mon Jun 20 21:36:53 2011
New Revision: 223347
URL: http://svn.freebsd.org/changeset/base/223347
Log:
As astopgap minimize the sched_lock coverage in pmap_activate() in order
to reduce lock contention.
Modified:
head/sys/sparc64/sparc64/pmap.c
Modified: head/sys/sparc64/sparc64/pmap.c
==============================================================================
--- head/sys/sparc64/sparc64/pmap.c Mon Jun 20 21:31:01 2011
(r223346)
+++ head/sys/sparc64/sparc64/pmap.c Mon Jun 20 21:36:53 2011
(r223347)
@@ -2217,11 +2217,10 @@ pmap_activate(struct thread *td)
struct pmap *pm;
int context;
+ critical_enter();
vm = td->td_proc->p_vmspace;
pm = vmspace_pmap(vm);
- mtx_lock_spin(&sched_lock);
-
context = PCPU_GET(tlb_ctx);
if (context == PCPU_GET(tlb_ctx_max)) {
tlb_flush_user();
@@ -2229,17 +2228,18 @@ pmap_activate(struct thread *td)
}
PCPU_SET(tlb_ctx, context + 1);
+ mtx_lock_spin(&sched_lock);
pm->pm_context[curcpu] = context;
CPU_SET(PCPU_GET(cpuid), &pm->pm_active);
PCPU_SET(pmap, pm);
+ mtx_unlock_spin(&sched_lock);
stxa(AA_DMMU_TSB, ASI_DMMU, pm->pm_tsb);
stxa(AA_IMMU_TSB, ASI_IMMU, pm->pm_tsb);
stxa(AA_DMMU_PCXR, ASI_DMMU, (ldxa(AA_DMMU_PCXR, ASI_DMMU) &
TLB_CXR_PGSZ_MASK) | context);
flush(KERNBASE);
-
- mtx_unlock_spin(&sched_lock);
+ critical_exit();
}
void
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