Messages in this thread | | | Subject | Re: [PATCH v2] more mapcount page as kpage could reduce total replacement times than fewer mapcount one in probability. | From | zhouxianrong <> | Date | Tue, 21 Jun 2016 09:57:54 +0800 |
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hey hugh: could you please give me some suggestion about this ?
On 2016/6/15 9:56, zhouxianrong@huawei.com wrote: > From: z00281421 <z00281421@notesmail.huawei.com> > > more mapcount page as kpage could reduce total replacement times > than fewer mapcount one when ksmd scan and replace among > forked pages later. > > Signed-off-by: z00281421 <z00281421@notesmail.huawei.com> > --- > mm/ksm.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/mm/ksm.c b/mm/ksm.c > index 4786b41..4d530af 100644 > --- a/mm/ksm.c > +++ b/mm/ksm.c > @@ -1094,6 +1094,14 @@ static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item, > { > int err; > > + /* > + * select more mapcount page as kpage > + */ > + if (page_mapcount(page) < page_mapcount(tree_page)) { > + swap(page, tree_page); > + swap(rmap_item, tree_rmap_item); > + } > + > err = try_to_merge_with_ksm_page(rmap_item, page, NULL); > if (!err) { > err = try_to_merge_with_ksm_page(tree_rmap_item, >
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