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Message-Id: <1433351167-125878-2-git-send-email-kirill.shutemov@linux.intel.com>
Date: Wed, 3 Jun 2015 20:05:32 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Hugh Dickins <hughd@...gle.com>
Cc: Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
Rik van Riel <riel@...hat.com>,
Vlastimil Babka <vbabka@...e.cz>,
Christoph Lameter <cl@...two.org>,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Steve Capper <steve.capper@...aro.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...e.cz>,
Jerome Marchand <jmarchan@...hat.com>,
Sasha Levin <sasha.levin@...cle.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv6 01/36] mm, proc: adjust PSS calculation
With new refcounting all subpages of the compound page are not nessessary
have the same mapcount. We need to take into account mapcount of every
sub-page.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Tested-by: Sasha Levin <sasha.levin@...cle.com>
Acked-by: Jerome Marchand <jmarchan@...hat.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
fs/proc/task_mmu.c | 48 +++++++++++++++++++++++++++++++-----------------
1 file changed, 31 insertions(+), 17 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 58be92e11939..f9b285761bc0 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -449,9 +449,10 @@ struct mem_size_stats {
};
static void smaps_account(struct mem_size_stats *mss, struct page *page,
- unsigned long size, bool young, bool dirty)
+ bool compound, bool young, bool dirty)
{
- int mapcount;
+ int i, nr = compound ? HPAGE_PMD_NR : 1;
+ unsigned long size = nr * PAGE_SIZE;
if (PageAnon(page))
mss->anonymous += size;
@@ -460,23 +461,36 @@ static void smaps_account(struct mem_size_stats *mss, struct page *page,
/* Accumulate the size in pages that have been accessed. */
if (young || PageReferenced(page))
mss->referenced += size;
- mapcount = page_mapcount(page);
- if (mapcount >= 2) {
- u64 pss_delta;
- if (dirty || PageDirty(page))
- mss->shared_dirty += size;
- else
- mss->shared_clean += size;
- pss_delta = (u64)size << PSS_SHIFT;
- do_div(pss_delta, mapcount);
- mss->pss += pss_delta;
- } else {
+ /*
+ * page_count(page) == 1 guarantees the page is mapped exactly once.
+ * If any subpage of the compound page mapped with PTE it would elevate
+ * page_count().
+ */
+ if (page_count(page) == 1) {
if (dirty || PageDirty(page))
mss->private_dirty += size;
else
mss->private_clean += size;
- mss->pss += (u64)size << PSS_SHIFT;
+ return;
+ }
+
+ for (i = 0; i < nr; i++, page++) {
+ int mapcount = page_mapcount(page);
+
+ if (mapcount >= 2) {
+ if (dirty || PageDirty(page))
+ mss->shared_dirty += PAGE_SIZE;
+ else
+ mss->shared_clean += PAGE_SIZE;
+ mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
+ } else {
+ if (dirty || PageDirty(page))
+ mss->private_dirty += PAGE_SIZE;
+ else
+ mss->private_clean += PAGE_SIZE;
+ mss->pss += PAGE_SIZE << PSS_SHIFT;
+ }
}
}
@@ -500,7 +514,8 @@ static void smaps_pte_entry(pte_t *pte, unsigned long addr,
if (!page)
return;
- smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte));
+
+ smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
@@ -516,8 +531,7 @@ static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
if (IS_ERR_OR_NULL(page))
return;
mss->anonymous_thp += HPAGE_PMD_SIZE;
- smaps_account(mss, page, HPAGE_PMD_SIZE,
- pmd_young(*pmd), pmd_dirty(*pmd));
+ smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
}
#else
static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
--
2.1.4
--
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