[RESEND PATCH v8 4/8] x86/tlb, mm/rmap: Separate arch_tlbbatch_clear() out of arch_tlbbatch_flush()

Byungchul Park
2024-02-26T03:06:36Z

This is a preparation for migrc mechanism that requires to avoid
redundant TLB flushes by manipulating tlb batch's arch data after
arch_tlbbatch_flush(). However, we cannot because the data is getting
cleared inside arch_tlbbatch_flush(). So separated the part clearing the
tlb batch's arch data out of arch_tlbbatch_flush().

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
arch/x86/mm/tlb.c | 2 --
mm/rmap.c | 1 +
2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 453ea95b667d..941f41df02f3 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1268,8 +1268,6 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
local_irq_enable();
}

- cpumask_clear(&batch->cpumask);
-
put_flush_tlb_info();
put_cpu();
}
diff --git a/mm/rmap.c b/mm/rmap.c
index da36f23ff7b0..b484d659d0c1 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -643,6 +643,7 @@ void try_to_unmap_flush(void)
return;

arch_tlbbatch_flush(&tlb_ubc->arch);
+ arch_tlbbatch_clear(&tlb_ubc->arch);
tlb_ubc->flush_required = false;
tlb_ubc->writable = false;
}
--
2.17.1