From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCHv6 01/36] mm, proc: adjust PSS calculation Date: Wed, 3 Jun 2015 20:05:32 +0300 [thread overview] Message-ID: <1433351167-125878-2-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1433351167-125878-1-git-send-email-kirill.shutemov@linux.intel.com> 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@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Jerome Marchand <jmarchan@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.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
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Hugh Dickins <hughd@google.com> Cc: Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>, Christoph Lameter <cl@gentwo.org>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Steve Capper <steve.capper@linaro.org>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Johannes Weiner <hannes@cmpxchg.org>, Michal Hocko <mhocko@suse.cz>, Jerome Marchand <jmarchan@redhat.com>, Sasha Levin <sasha.levin@oracle.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCHv6 01/36] mm, proc: adjust PSS calculation Date: Wed, 3 Jun 2015 20:05:32 +0300 [thread overview] Message-ID: <1433351167-125878-2-git-send-email-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <1433351167-125878-1-git-send-email-kirill.shutemov@linux.intel.com> 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@linux.intel.com> Tested-by: Sasha Levin <sasha.levin@oracle.com> Acked-by: Jerome Marchand <jmarchan@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-06-03 17:07 UTC|newest] Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-06-03 17:05 [PATCHv6 00/36] THP refcounting redesign Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov [this message] 2015-06-03 17:05 ` [PATCHv6 01/36] mm, proc: adjust PSS calculation Kirill A. Shutemov 2015-06-09 12:29 ` Vlastimil Babka 2015-06-09 12:29 ` Vlastimil Babka 2015-06-22 10:02 ` Kirill A. Shutemov 2015-06-22 10:02 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 02/36] rmap: add argument to charge compound page Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 03/36] memcg: adjust to support new THP refcounting Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 04/36] mm, thp: adjust conditions when we can reuse the page on WP fault Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 05/36] mm: adjust FOLL_SPLIT for new refcounting Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 06/36] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 07/36] thp, mlock: do not allow huge pages in mlocked area Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 08/36] khugepaged: ignore pmd tables with THP mapped with ptes Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 09/36] thp: rename split_huge_page_pmd() to split_huge_pmd() Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 10/36] mm, vmstats: new THP splitting event Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 11/36] mm: temporally mark THP broken Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 12/36] thp: drop all split_huge_page()-related code Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 13/36] mm: drop tail page refcounting Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-09 13:59 ` Vlastimil Babka 2015-06-09 13:59 ` Vlastimil Babka 2015-06-03 17:05 ` [PATCHv6 14/36] futex, thp: remove special case for THP in get_futex_key Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 15/36] ksm: prepare to new THP semantics Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 16/36] mm, thp: remove compound_lock Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 17/36] arm64, thp: remove infrastructure for handling splitting PMDs Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 18/36] arm, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 19/36] mips, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 20/36] powerpc, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 21/36] s390, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 22/36] sparc, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 23/36] tile, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 24/36] x86, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 25/36] mm, " Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 26/36] mm: rework mapcount accounting to enable 4k mapping of THPs Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-10 13:47 ` Vlastimil Babka 2015-06-10 13:47 ` Vlastimil Babka 2015-06-22 10:22 ` Kirill A. Shutemov 2015-06-22 10:22 ` Kirill A. Shutemov 2015-06-03 17:05 ` [PATCHv6 27/36] mm: differentiate page_mapped() from page_mapcount() for compound pages Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-09 10:58 ` Kirill A. Shutemov 2015-06-09 10:58 ` Kirill A. Shutemov 2015-06-10 14:34 ` Vlastimil Babka 2015-06-10 14:34 ` Vlastimil Babka 2015-06-03 17:05 ` [PATCHv6 28/36] mm, numa: skip PTE-mapped THP on numa fault Kirill A. Shutemov 2015-06-03 17:05 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 29/36] thp: implement split_huge_pmd() Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-11 9:49 ` Vlastimil Babka 2015-06-11 9:49 ` Vlastimil Babka 2015-06-22 11:14 ` Kirill A. Shutemov 2015-06-22 11:14 ` Kirill A. Shutemov 2015-06-22 16:01 ` Vlastimil Babka 2015-06-22 16:01 ` Vlastimil Babka 2015-06-03 17:06 ` [PATCHv6 30/36] thp: add option to setup migration entiries during PMD split Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 31/36] thp, mm: split_huge_page(): caller need to lock page Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 32/36] thp: reintroduce split_huge_page() Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-10 15:44 ` Vlastimil Babka 2015-06-10 15:44 ` Vlastimil Babka 2015-06-22 11:28 ` Kirill A. Shutemov 2015-06-22 11:28 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 33/36] migrate_pages: try to split pages on qeueuing Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-11 9:27 ` Vlastimil Babka 2015-06-11 9:27 ` Vlastimil Babka 2015-06-22 11:35 ` Kirill A. Shutemov 2015-06-22 11:35 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 34/36] thp: introduce deferred_split_huge_page() Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 35/36] mm: re-enable THP Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-03 17:06 ` [PATCHv6 36/36] thp: update documentation Kirill A. Shutemov 2015-06-03 17:06 ` Kirill A. Shutemov 2015-06-11 12:30 ` Vlastimil Babka 2015-06-11 12:30 ` Vlastimil Babka 2015-06-22 13:18 ` Kirill A. Shutemov 2015-06-22 13:18 ` Kirill A. Shutemov 2015-06-22 16:07 ` Vlastimil Babka 2015-06-22 16:07 ` Vlastimil Babka 2015-06-16 13:17 ` [PATCHv6 00/36] THP refcounting redesign Jerome Marchand 2015-06-22 13:21 ` Kirill A. Shutemov 2015-06-22 13:21 ` Kirill A. Shutemov 2015-06-22 13:32 ` Jerome Marchand 2015-06-22 13:39 ` Kirill A. Shutemov 2015-06-22 13:39 ` Kirill A. Shutemov
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