From: Hillf Danton <dhillf@gmail.com>
To: Linux-MM <linux-mm@kvack.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Michal Hocko <mhocko@suse.cz>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Hugh Dickins <hughd@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hillf Danton <dhillf@gmail.com>
Subject: [PATCH] mm: hugetlb: bail out unmapping after serving reference page
Date: Wed, 22 Feb 2012 20:35:34 +0800 [thread overview]
Message-ID: <CAJd=RBALNtedfq+PLPnGKd4i4D0mLiVPdW_7pWWopnSZNC_vqA@mail.gmail.com> (raw)
When unmapping given VM range, we could bail out if a reference page is
supplied and it is unmapped, which is a minor optimization.
Signed-off-by: Hillf Danton <dhillf@gmail.com>
---
--- a/mm/hugetlb.c Wed Feb 22 19:34:12 2012
+++ b/mm/hugetlb.c Wed Feb 22 19:50:26 2012
@@ -2280,6 +2280,9 @@ void __unmap_hugepage_range(struct vm_ar
if (pte_dirty(pte))
set_page_dirty(page);
list_add(&page->lru, &page_list);
+
+ if (page == ref_page)
+ break;
}
spin_unlock(&mm->page_table_lock);
flush_tlb_range(vma, start, end);
--
--
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next reply other threads:[~2012-02-22 12:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-22 12:35 Hillf Danton [this message]
2012-02-22 21:06 ` Andrew Morton
2012-02-23 13:05 ` Hillf Danton
2012-02-23 20:12 ` Andrew Morton
2012-03-21 21:00 ` Andrew Morton
2012-03-22 13:21 ` Hillf Danton
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