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smp: fix smp false sharing

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Matheus
2026-07-17 18:06:32 -03:00
parent 02ba3e3939
commit b9531c0ec7
1 changed files with 5 additions and 3 deletions
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kernel-src/arch/x86-64/smp.c
+5 -3
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@@ -95,7 +95,8 @@ void arch_smp_wakeup(void) {
printf("smp: %d processor%s\n", response->cpu_count, response->cpu_count > 1 ? "s" : "");
// use physical pages so the other cpus have it on the hhdm
size_t cpu_size = ROUND_UP(sizeof(cpu_t) * response->cpu_count, PAGE_SIZE);
size_t cpu_stride = ROUND_UP(sizeof(cpu_t), cpu_cache_line_size());
size_t cpu_size = ROUND_UP(cpu_stride * response->cpu_count, PAGE_SIZE);
cpu_t *cpus = mm_alloc_pages(cpu_size / PAGE_SIZE, MEMORY_SECTION_DEFAULT);
__assert(cpus);
cpus = MAKE_HHDM(cpus);
@@ -114,8 +115,9 @@ void arch_smp_wakeup(void) {
continue;
}
smp_cpus[i] = &cpus[i];
response->cpus[i]->extra_argument = (uint64_t)&cpus[i];
cpu_t *cpu = (cpu_t *)((uintptr_t)cpus + cpu_stride * i);
smp_cpus[i] = cpu;
response->cpus[i]->extra_argument = (uint64_t)cpu;
__atomic_store_n(&response->cpus[i]->goto_address, wakeupfn, __ATOMIC_SEQ_CST);
}