[v8,08/12] x86/mm: use broadcast TLB flushing for page reclaim TLB flushing

Commit Message

Rik van Riel Feb. 5, 2025, 1:39 a.m. UTC

In the page reclaim code, we only track the CPU(s) where the TLB needs
to be flushed, rather than all the individual mappings that may be getting
invalidated.

Use broadcast TLB flushing when that is available.

Signed-off-by: Rik van Riel <[e-mail]>
Tested-by: Manali Shukla <[e-mail]>
---
 arch/x86/mm/tlb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 43e1abd4bcb0..25c13416a0e8 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1326,7 +1326,9 @@  void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
 	 * a local TLB flush is needed. Optimize this use-case by calling
 	 * flush_tlb_func_local() directly in this case.
 	 */
-	if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) {
+	if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) {
+		invlpgb_flush_all_nonglobals();
+	} else if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) {
 		flush_tlb_multi(&batch->cpumask, info);
 	} else if (cpumask_test_cpu(cpu, &batch->cpumask)) {
 		lockdep_assert_irqs_enabled();