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mmu: shootdown optimizations

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Matheus
2025-09-01 21:38:58 -03:00
parent e28b2b1f2f
commit 6a2e83cc49
1 changed files with 6 additions and 2 deletions
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kernel-src/arch/x86-64/mmu.c
+6 -2
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@@ -228,11 +228,12 @@ void arch_mmu_invalidate_range(void *page, size_t size) {
__assert(((uintptr_t)page % PAGE_SIZE) == 0); __assert(((uintptr_t)page % PAGE_SIZE) == 0);
thread_t *thread = current_thread(); thread_t *thread = current_thread();
bool user_shootdown = (page >= USERSPACE_START && page < USERSPACE_END);
bool do_shootdown = // do shootdown if bool do_shootdown = // do shootdown if
current_thread() // scheduler is up current_thread() // scheduler is up
&& arch_smp_cpusawake >= 2 // and there are multiple cpus in the system && arch_smp_cpusawake >= 2 // and there are multiple cpus in the system
&& (page >= KERNELSPACE_START // and its either in the kernel && (page >= KERNELSPACE_START // and its either in the kernel
|| ((page == NULL || (page >= USERSPACE_START && page < USERSPACE_END)) // or in userspace... || ((page == NULL || user_shootdown) // or in userspace...
&& thread->proc && thread->proc->runningthreadcount > 1)); // in a process which has multiple threads running && thread->proc && thread->proc->runningthreadcount > 1)); // in a process which has multiple threads running
int shootdown_done = 0; int shootdown_done = 0;
@@ -242,7 +243,10 @@ void arch_mmu_invalidate_range(void *page, size_t size) {
old_ipl = interrupt_raiseipl(IPL_DPC); old_ipl = interrupt_raiseipl(IPL_DPC);
for (int i = 0; i < arch_smp_cpusawake; ++i) { for (int i = 0; i < arch_smp_cpusawake; ++i) {
if (smp_cpus[i] == current_cpu()) // reading the vmm context like this is racey but there are no ill side effects other than spurious shootdowns
// if a cpu changes to this vmmctx, they will already have done a tlb invalidation.
// if it changes out of it, same thing
if (smp_cpus[i] == current_cpu() || (user_shootdown && smp_cpus[i]->vmmctx != current_thread()->vmmctx))
continue; continue;
spinlock_acquire(&smp_cpus[i]->shootdown_lock); spinlock_acquire(&smp_cpus[i]->shootdown_lock);