From: Andrea Arcangeli <aarcange@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Khalid Aziz <khalid.aziz@oracle.com>,
Pravin Shelar <pshelar@nicira.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ben Hutchings <bhutchings@solarflare.com>,
Christoph Lameter <cl@linux.com>,
Johannes Weiner <jweiner@redhat.com>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
Andi Kleen <andi@firstfloor.org>,
Minchan Kim <minchan@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [PATCH 2/8] mm: hugetlb: use get_page_foll in follow_hugetlb_page
Date: Wed, 20 Nov 2013 18:51:10 +0100 [thread overview]
Message-ID: <1384969876-6374-3-git-send-email-aarcange@redhat.com> (raw)
In-Reply-To: <1384969876-6374-1-git-send-email-aarcange@redhat.com>
get_page_foll is more optimal and is always safe to use under the PT
lock. More so for hugetlbfs as there's no risk of race conditions with
split_huge_page regardless of the PT lock.
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 14737f8e..f03e068 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3113,7 +3113,7 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
same_page:
if (pages) {
pages[i] = mem_map_offset(page, pfn_offset);
- get_page(pages[i]);
+ get_page_foll(pages[i]);
}
if (vmas)
--
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next prev parent reply other threads:[~2013-11-20 17:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-20 17:51 [PATCH 0/8] mm: hugetlbfs: fix hugetlbfs optimization v3 Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 1/8] mm: hugetlbfs: fix hugetlbfs optimization Andrea Arcangeli
2013-11-20 17:51 ` Andrea Arcangeli [this message]
2013-11-20 17:51 ` [PATCH 3/8] mm: hugetlbfs: move the put/get_page slab and hugetlbfs optimization in a faster path Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 4/8] mm: thp: optimize compound_trans_huge Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 5/8] mm: tail page refcounting optimization for slab and hugetlbfs Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 6/8] mm/hugetlb.c: simplify PageHeadHuge() and PageHuge() Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 7/8] mm/swap.c: reorganize put_compound_page() Andrea Arcangeli
2013-11-20 17:51 ` [PATCH 8/8] mm/hugetlb.c: defer PageHeadHuge() symbol export Andrea Arcangeli
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