From: Zi Yan <zi.yan@sent.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Michal Hocko <mhocko@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
Mel Gorman <mgorman@techsingularity.net>,
John Hubbard <jhubbard@nvidia.com>,
Mark Hairgrove <mhairgrove@nvidia.com>,
Nitin Gupta <nigupta@nvidia.com>,
David Nellans <dnellans@nvidia.com>, Zi Yan <ziy@nvidia.com>
Subject: [RFC PATCH 21/31] mm: thp: 1GB zero page shrinker.
Date: Fri, 15 Feb 2019 14:08:46 -0800 [thread overview]
Message-ID: <20190215220856.29749-22-zi.yan@sent.com> (raw)
In-Reply-To: <20190215220856.29749-1-zi.yan@sent.com>
From: Zi Yan <ziy@nvidia.com>
Remove 1GB zero page when we are under memory pressure.
Signed-off-by: Zi Yan <ziy@nvidia.com>
---
mm/huge_memory.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index bbdbc9ae06bf..41adc103ead1 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -207,6 +207,32 @@ static struct shrinker huge_zero_page_shrinker = {
.seeks = DEFAULT_SEEKS,
};
+static unsigned long shrink_huge_pud_zero_page_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ /* we can free zero page only if last reference remains */
+ return atomic_read(&huge_pud_zero_refcount) == 1 ? HPAGE_PUD_NR : 0;
+}
+
+static unsigned long shrink_huge_pud_zero_page_scan(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ if (atomic_cmpxchg(&huge_pud_zero_refcount, 1, 0) == 1) {
+ struct page *zero_page = xchg(&huge_pud_zero_page, NULL);
+ BUG_ON(zero_page == NULL);
+ __free_pages(zero_page, compound_order(zero_page));
+ return HPAGE_PUD_NR;
+ }
+
+ return 0;
+}
+
+static struct shrinker huge_pud_zero_page_shrinker = {
+ .count_objects = shrink_huge_pud_zero_page_count,
+ .scan_objects = shrink_huge_pud_zero_page_scan,
+ .seeks = DEFAULT_SEEKS,
+};
+
#ifdef CONFIG_SYSFS
static ssize_t enabled_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
@@ -474,6 +500,9 @@ static int __init hugepage_init(void)
err = register_shrinker(&huge_zero_page_shrinker);
if (err)
goto err_hzp_shrinker;
+ err = register_shrinker(&huge_pud_zero_page_shrinker);
+ if (err)
+ goto err_hpzp_shrinker;
err = register_shrinker(&deferred_split_shrinker);
if (err)
goto err_split_shrinker;
@@ -496,6 +525,8 @@ static int __init hugepage_init(void)
err_khugepaged:
unregister_shrinker(&deferred_split_shrinker);
err_split_shrinker:
+ unregister_shrinker(&huge_pud_zero_page_shrinker);
+err_hpzp_shrinker:
unregister_shrinker(&huge_zero_page_shrinker);
err_hzp_shrinker:
khugepaged_destroy();
--
2.20.1
next prev parent reply other threads:[~2019-02-15 22:10 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 22:08 [RFC PATCH 00/31] Generating physically contiguous memory after page allocation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 01/31] mm: migrate: Add exchange_pages to exchange two lists of pages Zi Yan
2019-02-17 11:29 ` Matthew Wilcox
2019-02-18 17:31 ` Zi Yan
2019-02-18 17:42 ` Vlastimil Babka
2019-02-18 17:51 ` Zi Yan
2019-02-18 17:52 ` Matthew Wilcox
2019-02-18 17:59 ` Zi Yan
2019-02-19 7:42 ` Anshuman Khandual
2019-02-19 12:56 ` Matthew Wilcox
2019-02-20 4:38 ` Anshuman Khandual
2019-03-14 2:39 ` Zi Yan
2019-02-21 21:10 ` Jerome Glisse
2019-02-21 21:25 ` Zi Yan
2019-02-15 22:08 ` [RFC PATCH 02/31] mm: migrate: Add THP exchange support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 03/31] mm: migrate: Add tmpfs " Zi Yan
2019-02-15 22:08 ` [RFC PATCH 04/31] mm: add mem_defrag functionality Zi Yan
2019-02-15 22:08 ` [RFC PATCH 05/31] mem_defrag: split a THP if either src or dst is THP only Zi Yan
2019-02-15 22:08 ` [RFC PATCH 06/31] mm: Make MAX_ORDER configurable in Kconfig for buddy allocator Zi Yan
2019-02-15 22:08 ` [RFC PATCH 07/31] mm: deallocate pages with order > MAX_ORDER Zi Yan
2019-02-15 22:08 ` [RFC PATCH 08/31] mm: add pagechain container for storing multiple pages Zi Yan
2019-02-15 22:08 ` [RFC PATCH 09/31] mm: thp: 1GB anonymous page implementation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 10/31] mm: proc: add 1GB THP kpageflag Zi Yan
2019-02-15 22:08 ` [RFC PATCH 11/31] mm: debug: print compound page order in dump_page() Zi Yan
2019-02-15 22:08 ` [RFC PATCH 12/31] mm: stats: Separate PMD THP and PUD THP stats Zi Yan
2019-02-15 22:08 ` [RFC PATCH 13/31] mm: thp: 1GB THP copy on write implementation Zi Yan
2019-02-15 22:08 ` [RFC PATCH 14/31] mm: thp: handling 1GB THP reference bit Zi Yan
2019-02-15 22:08 ` [RFC PATCH 15/31] mm: thp: add 1GB THP split_huge_pud_page() function Zi Yan
2019-02-15 22:08 ` [RFC PATCH 16/31] mm: thp: check compound_mapcount of PMD-mapped PUD THPs at free time Zi Yan
2019-02-15 22:08 ` [RFC PATCH 17/31] mm: thp: split properly PMD-mapped PUD THP to PTE-mapped PUD THP Zi Yan
2019-02-15 22:08 ` [RFC PATCH 18/31] mm: page_vma_walk: teach it about PMD-mapped " Zi Yan
2019-02-15 22:08 ` [RFC PATCH 19/31] mm: thp: 1GB THP support in try_to_unmap() Zi Yan
2019-02-15 22:08 ` [RFC PATCH 20/31] mm: thp: split 1GB THPs at page reclaim Zi Yan
2019-02-15 22:08 ` Zi Yan [this message]
2019-02-15 22:08 ` [RFC PATCH 22/31] mm: thp: 1GB THP follow_p*d_page() support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 23/31] mm: support 1GB THP pagemap support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 24/31] sysctl: add an option to only print the head page virtual address Zi Yan
2019-02-15 22:08 ` [RFC PATCH 25/31] mm: thp: add a knob to enable/disable 1GB THPs Zi Yan
2019-02-15 22:08 ` [RFC PATCH 26/31] mm: thp: promote PTE-mapped THP to PMD-mapped THP Zi Yan
2019-02-15 22:08 ` [RFC PATCH 27/31] mm: thp: promote PMD-mapped PUD pages to PUD-mapped PUD pages Zi Yan
2019-02-15 22:08 ` [RFC PATCH 28/31] mm: vmstats: add page promotion stats Zi Yan
2019-02-15 22:08 ` [RFC PATCH 29/31] mm: madvise: add madvise options to split PMD and PUD THPs Zi Yan
2019-02-15 22:08 ` [RFC PATCH 30/31] mm: mem_defrag: thp: PMD THP and PUD THP in-place promotion support Zi Yan
2019-02-15 22:08 ` [RFC PATCH 31/31] sysctl: toggle to promote PUD-mapped 1GB THP or not Zi Yan
2019-02-20 1:42 ` [RFC PATCH 00/31] Generating physically contiguous memory after page allocation Mike Kravetz
2019-02-20 2:33 ` Zi Yan
2019-02-20 3:18 ` Mike Kravetz
2019-02-20 5:19 ` Zi Yan
2019-02-20 5:27 ` Mike Kravetz
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