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 14/31] mm: thp: handling 1GB THP reference bit.
Date: Fri, 15 Feb 2019 14:08:39 -0800 [thread overview]
Message-ID: <20190215220856.29749-15-zi.yan@sent.com> (raw)
In-Reply-To: <20190215220856.29749-1-zi.yan@sent.com>
From: Zi Yan <ziy@nvidia.com>
Add PUD-level TLB flush ops and teach page_vma_mapped_talk about 1GB
THPs.
Signed-off-by: Zi Yan <ziy@nvidia.com>
---
arch/x86/include/asm/pgtable.h | 3 +++
arch/x86/mm/pgtable.c | 13 +++++++++++++
include/asm-generic/pgtable.h | 14 ++++++++++++++
include/linux/mmu_notifier.h | 13 +++++++++++++
include/linux/rmap.h | 1 +
mm/page_vma_mapped.c | 33 +++++++++++++++++++++++++++++----
mm/rmap.c | 12 +++++++++---
7 files changed, 82 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index ae3ac49c32ad..f99ce657d282 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1151,6 +1151,9 @@ extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
+#define __HAVE_ARCH_PUDP_CLEAR_YOUNG_FLUSH
+extern int pudp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pud_t *pudp);
#define pmd_write pmd_write
static inline int pmd_write(pmd_t pmd)
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 0a5008690d7c..0edcfa8007cb 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -643,6 +643,19 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
return young;
}
+int pudp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pud_t *pudp)
+{
+ int young;
+
+ VM_BUG_ON(address & ~HPAGE_PUD_MASK);
+
+ young = pudp_test_and_clear_young(vma, address, pudp);
+ if (young)
+ flush_tlb_range(vma, address, address + HPAGE_PUD_SIZE);
+
+ return young;
+}
#endif
/**
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 0f626d6177c3..682531e0d55c 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -121,6 +121,20 @@ static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
+#ifndef __HAVE_ARCH_PUDP_CLEAR_YOUNG_FLUSH
+#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
+extern int pudp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pud_t *pudp);
+#else
+int pudp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pud_t *pudp)
+{
+ BUILD_BUG();
+ return 0;
+}
+#endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
+#endif
+
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
unsigned long address,
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h
index 4050ec1c3b45..6850b9e9b2cb 100644
--- a/include/linux/mmu_notifier.h
+++ b/include/linux/mmu_notifier.h
@@ -353,6 +353,19 @@ static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
__young; \
})
+#define pudp_clear_flush_young_notify(__vma, __address, __pudp) \
+({ \
+ int __young; \
+ struct vm_area_struct *___vma = __vma; \
+ unsigned long ___address = __address; \
+ __young = pudp_clear_flush_young(___vma, ___address, __pudp); \
+ __young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \
+ ___address, \
+ ___address + \
+ PUD_SIZE); \
+ __young; \
+})
+
#define ptep_clear_young_notify(__vma, __address, __ptep) \
({ \
int __young; \
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 988d176472df..2b566736e3c2 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -206,6 +206,7 @@ struct page_vma_mapped_walk {
struct page *page;
struct vm_area_struct *vma;
unsigned long address;
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;
spinlock_t *ptl;
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index 11df03e71288..a473553aa9a5 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -141,9 +141,12 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
struct page *page = pvmw->page;
pgd_t *pgd;
p4d_t *p4d;
- pud_t *pud;
+ pud_t pude;
pmd_t pmde;
+ if (!pvmw->pte && !pvmw->pmd && pvmw->pud)
+ return not_found(pvmw);
+
/* The only possible pmd mapping has been handled on last iteration */
if (pvmw->pmd && !pvmw->pte)
return not_found(pvmw);
@@ -171,10 +174,31 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
p4d = p4d_offset(pgd, pvmw->address);
if (!p4d_present(*p4d))
return false;
- pud = pud_offset(p4d, pvmw->address);
- if (!pud_present(*pud))
+ pvmw->pud = pud_offset(p4d, pvmw->address);
+
+ /*
+ * Make sure the pud value isn't cached in a register by the
+ * compiler and used as a stale value after we've observed a
+ * subsequent update.
+ */
+ pude = READ_ONCE(*pvmw->pud);
+ if (pud_trans_huge(pude)) {
+ pvmw->ptl = pud_lock(mm, pvmw->pud);
+ if (likely(pud_trans_huge(*pvmw->pud))) {
+ if (pvmw->flags & PVMW_MIGRATION)
+ return not_found(pvmw);
+ if (pud_page(*pvmw->pud) != page)
+ return not_found(pvmw);
+ return true;
+ } else {
+ /* THP pud was split under us: handle on pmd level */
+ spin_unlock(pvmw->ptl);
+ pvmw->ptl = NULL;
+ }
+ } else if (!pud_present(pude))
return false;
- pvmw->pmd = pmd_offset(pud, pvmw->address);
+
+ pvmw->pmd = pmd_offset(pvmw->pud, pvmw->address);
/*
* Make sure the pmd value isn't cached in a register by the
* compiler and used as a stale value after we've observed a
@@ -210,6 +234,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
} else if (!pmd_present(pmde)) {
return false;
}
+
if (!map_pte(pvmw))
goto next_pte;
while (1) {
diff --git a/mm/rmap.c b/mm/rmap.c
index dae66a4329ea..f69d81d4a956 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -789,9 +789,15 @@ static bool page_referenced_one(struct page *page, struct vm_area_struct *vma,
referenced++;
}
} else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
- if (pmdp_clear_flush_young_notify(vma, address,
- pvmw.pmd))
- referenced++;
+ if (pvmw.pmd) {
+ if (pmdp_clear_flush_young_notify(vma, address,
+ pvmw.pmd))
+ referenced++;
+ } else if (pvmw.pud) {
+ if (pudp_clear_flush_young_notify(vma, address,
+ pvmw.pud))
+ referenced++;
+ }
} else {
/* unexpected pmd-mapped page? */
WARN_ON_ONCE(1);
--
2.20.1
next prev parent reply other threads:[~2019-02-15 22:09 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 ` Zi Yan [this message]
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 ` [RFC PATCH 21/31] mm: thp: 1GB zero page shrinker Zi Yan
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190215220856.29749-15-zi.yan@sent.com \
--to=zi.yan@sent.com \
--cc=akpm@linux-foundation.org \
--cc=dave.hansen@linux.intel.com \
--cc=dnellans@nvidia.com \
--cc=jhubbard@nvidia.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@techsingularity.net \
--cc=mhairgrove@nvidia.com \
--cc=mhocko@kernel.org \
--cc=nigupta@nvidia.com \
--cc=vbabka@suse.cz \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).