linux-kernel - [PATCH 2/2] mm/apply_to_range: call pte function with lazy updates

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Date:	Thu, 13 Nov 2008 09:19:49 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: [PATCH 2/2] mm/apply_to_range: call pte function with lazy updates

Make the pte-level function in apply_to_range be called in lazy mmu
mode, so that any pagetable modifications can be batched.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 mm/memory.c |    4 ++++
 1 file changed, 4 insertions(+)

===================================================================
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1545,6 +1545,8 @@
 
 	BUG_ON(pmd_huge(*pmd));
 
+	arch_enter_lazy_mmu_mode();
+
 	token = pmd_pgtable(*pmd);
 
 	do {
@@ -1552,6 +1554,8 @@
 		if (err)
 			break;
 	} while (pte++, addr += PAGE_SIZE, addr != end);
+
+	arch_leave_lazy_mmu_mode();
 
 	if (mm != &init_mm)
 		pte_unmap_unlock(pte-1, ptl);


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