linux-kernel - [PATCH v9 4/8] x86/tlb, mm/rmap: separate arch_tlbbatch_clear() out of arch_tlbbatch

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Message-Id: <20240417071847.29584-5-byungchul@sk.com>
Date: Wed, 17 Apr 2024 16:18:43 +0900
From: Byungchul Park <byungchul@...com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc: kernel_team@...ynix.com,
	akpm@...ux-foundation.org,
	ying.huang@...el.com,
	vernhao@...cent.com,
	mgorman@...hsingularity.net,
	hughd@...gle.com,
	willy@...radead.org,
	david@...hat.com,
	peterz@...radead.org,
	luto@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	rjgolo@...il.com
Subject: [PATCH v9 4/8] x86/tlb, mm/rmap: separate arch_tlbbatch_clear() out of arch_tlbbatch_flush()

This is a preparation for migrc mechanism that requires to avoid
redundant tlb flushes by manipulating tlb batch's arch data.  To achieve
that, it's needed to separate the part clearing the tlb batch's arch
data out of arch_tlbbatch_flush().

Signed-off-by: Byungchul Park <byungchul@...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 44ac64f3a047..24bce69222cd 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1265,8 +1265,6 @@ 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 2542bfe1a947..d8671d0dc416 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -673,6 +673,7 @@ 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