From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Al Viro <viro@zeniv.linux.org.uk>,
Hugh Dickins <hughd@google.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, Andi Kleen <ak@linux.intel.com>,
Matthew Wilcox <matthew.r.wilcox@intel.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Hillf Danton <dhillf@gmail.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv2, RFC 16/30] thp: handle file pages in split_huge_page()
Date: Thu, 14 Mar 2013 19:50:21 +0200 [thread overview]
Message-ID: <1363283435-7666-17-git-send-email-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <1363283435-7666-1-git-send-email-kirill.shutemov@linux.intel.com>
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
The base scheme is the same as for anonymous pages, but we walk by
mapping->i_mmap rather then anon_vma->rb_root.
__split_huge_page_refcount() has been tunned a bit: we need to transfer
PG_swapbacked to tail pages.
Splitting mapped pages haven't tested at all, since we cannot mmap()
file-backed huge pages yet.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/huge_memory.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 54 insertions(+), 9 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index e2f7f5aa..eb777d3 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1613,7 +1613,8 @@ static void __split_huge_page_refcount(struct page *page)
((1L << PG_referenced) |
(1L << PG_swapbacked) |
(1L << PG_mlocked) |
- (1L << PG_uptodate)));
+ (1L << PG_uptodate) |
+ (1L << PG_swapbacked)));
page_tail->flags |= (1L << PG_dirty);
/* clear PageTail before overwriting first_page */
@@ -1641,10 +1642,8 @@ static void __split_huge_page_refcount(struct page *page)
page_tail->index = page->index + i;
page_nid_xchg_last(page_tail, page_nid_last(page));
- BUG_ON(!PageAnon(page_tail));
BUG_ON(!PageUptodate(page_tail));
BUG_ON(!PageDirty(page_tail));
- BUG_ON(!PageSwapBacked(page_tail));
lru_add_page_tail(page, page_tail, lruvec);
}
@@ -1752,7 +1751,7 @@ static int __split_huge_page_map(struct page *page,
}
/* must be called with anon_vma->root->rwsem held */
-static void __split_huge_page(struct page *page,
+static void __split_anon_huge_page(struct page *page,
struct anon_vma *anon_vma)
{
int mapcount, mapcount2;
@@ -1799,14 +1798,11 @@ static void __split_huge_page(struct page *page,
BUG_ON(mapcount != mapcount2);
}
-int split_huge_page(struct page *page)
+static int split_anon_huge_page(struct page *page)
{
struct anon_vma *anon_vma;
int ret = 1;
- BUG_ON(is_huge_zero_pfn(page_to_pfn(page)));
- BUG_ON(!PageAnon(page));
-
/*
* The caller does not necessarily hold an mmap_sem that would prevent
* the anon_vma disappearing so we first we take a reference to it
@@ -1824,7 +1820,7 @@ int split_huge_page(struct page *page)
goto out_unlock;
BUG_ON(!PageSwapBacked(page));
- __split_huge_page(page, anon_vma);
+ __split_anon_huge_page(page, anon_vma);
count_vm_event(THP_SPLIT);
BUG_ON(PageCompound(page));
@@ -1835,6 +1831,55 @@ out:
return ret;
}
+static int split_file_huge_page(struct page *page)
+{
+ struct address_space *mapping = page->mapping;
+ pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
+ struct vm_area_struct *vma;
+ int mapcount, mapcount2;
+
+ BUG_ON(!PageHead(page));
+ BUG_ON(PageTail(page));
+
+ mutex_lock(&mapping->i_mmap_mutex);
+ mapcount = 0;
+ vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
+ unsigned long addr = vma_address(page, vma);
+ mapcount += __split_huge_page_splitting(page, vma, addr);
+ }
+
+ if (mapcount != page_mapcount(page))
+ printk(KERN_ERR "mapcount %d page_mapcount %d\n",
+ mapcount, page_mapcount(page));
+ BUG_ON(mapcount != page_mapcount(page));
+
+ __split_huge_page_refcount(page);
+
+ mapcount2 = 0;
+ vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
+ unsigned long addr = vma_address(page, vma);
+ mapcount2 += __split_huge_page_map(page, vma, addr);
+ }
+
+ if (mapcount != mapcount2)
+ printk(KERN_ERR "mapcount %d mapcount2 %d page_mapcount %d\n",
+ mapcount, mapcount2, page_mapcount(page));
+ BUG_ON(mapcount != mapcount2);
+ count_vm_event(THP_SPLIT);
+ mutex_unlock(&mapping->i_mmap_mutex);
+ return 0;
+}
+
+int split_huge_page(struct page *page)
+{
+ BUG_ON(is_huge_zero_pfn(page_to_pfn(page)));
+
+ if (PageAnon(page))
+ return split_anon_huge_page(page);
+ else
+ return split_file_huge_page(page);
+}
+
#define VM_NO_THP (VM_SPECIAL|VM_MIXEDMAP|VM_HUGETLB|VM_SHARED|VM_MAYSHARE)
int hugepage_madvise(struct vm_area_struct *vma,
--
1.7.10.4
--
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next prev parent reply other threads:[~2013-03-14 17:50 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-14 17:50 [PATCHv2, RFC 00/30] Transparent huge page cache Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 01/30] block: implement add_bdi_stat() Kirill A. Shutemov
2013-03-21 14:46 ` Dave Hansen
2013-03-21 17:19 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 02/30] mm: implement zero_huge_user_segment and friends Kirill A. Shutemov
2013-03-21 15:23 ` Dave Hansen
2013-03-22 9:21 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 03/30] mm: drop actor argument of do_generic_file_read() Kirill A. Shutemov
2013-03-15 0:21 ` Hillf Danton
2013-03-15 0:27 ` Hillf Danton
2013-03-15 13:22 ` Kirill A. Shutemov
2013-03-21 15:26 ` Dave Hansen
2013-03-14 17:50 ` [PATCHv2, RFC 04/30] radix-tree: implement preload for multiple contiguous elements Kirill A. Shutemov
2013-03-21 15:56 ` Dave Hansen
2013-03-22 9:47 ` Kirill A. Shutemov
2013-03-22 14:38 ` Dave Hansen
2013-03-25 13:03 ` Kirill A. Shutemov
2013-04-05 3:37 ` Ric Mason
2013-03-14 17:50 ` [PATCHv2, RFC 05/30] thp, mm: avoid PageUnevictable on active/inactive lru lists Kirill A. Shutemov
2013-03-21 16:15 ` Dave Hansen
2013-03-22 10:11 ` Kirill A. Shutemov
2013-04-05 3:42 ` Ric Mason
2013-03-14 17:50 ` [PATCHv2, RFC 06/30] thp, mm: basic defines for transparent huge page cache Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 07/30] thp, mm: introduce mapping_can_have_hugepages() predicate Kirill A. Shutemov
2013-03-21 16:21 ` Dave Hansen
2013-03-22 10:12 ` Kirill A. Shutemov
2013-03-22 14:44 ` Dave Hansen
2013-04-02 14:46 ` Kirill A. Shutemov
2013-04-05 3:45 ` Ric Mason
2013-04-05 3:48 ` Ric Mason
2013-03-14 17:50 ` [PATCHv2, RFC 08/30] thp, mm: rewrite add_to_page_cache_locked() to support huge pages Kirill A. Shutemov
2013-03-15 1:30 ` Hillf Danton
2013-03-15 13:23 ` Kirill A. Shutemov
2013-03-15 13:25 ` Hillf Danton
2013-03-15 13:50 ` Kirill A. Shutemov
2013-03-15 13:55 ` Hillf Danton
2013-03-15 15:05 ` Kirill A. Shutemov
2013-03-21 17:11 ` Dave Hansen
2013-03-22 10:34 ` Kirill A. Shutemov
2013-03-22 14:51 ` Dave Hansen
2013-03-14 17:50 ` [PATCHv2, RFC 09/30] thp, mm: rewrite delete_from_page_cache() " Kirill A. Shutemov
2013-03-15 2:25 ` Hillf Danton
2013-03-15 13:23 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 10/30] thp, mm: locking tail page is a bug Kirill A. Shutemov
2013-03-21 17:20 ` Dave Hansen
2013-03-14 17:50 ` [PATCHv2, RFC 11/30] thp, mm: handle tail pages in page_cache_get_speculative() Kirill A. Shutemov
2013-04-05 4:03 ` Ric Mason
2013-03-14 17:50 ` [PATCHv2, RFC 12/30] thp, mm: add event counters for huge page alloc on write to a file Kirill A. Shutemov
2013-03-21 17:59 ` Dave Hansen
2013-03-26 8:40 ` Kirill A. Shutemov
2013-04-05 4:05 ` Ric Mason
2013-03-14 17:50 ` [PATCHv2, RFC 13/30] thp, mm: implement grab_cache_huge_page_write_begin() Kirill A. Shutemov
2013-03-15 2:34 ` Hillf Danton
2013-03-15 13:24 ` Kirill A. Shutemov
2013-03-15 13:30 ` Hillf Danton
2013-03-15 13:35 ` Kirill A. Shutemov
2013-03-15 13:37 ` Hillf Danton
2013-03-21 18:15 ` Dave Hansen
2013-03-26 10:48 ` Kirill A. Shutemov
2013-03-26 15:40 ` Dave
2013-03-21 18:16 ` Dave Hansen
2013-03-14 17:50 ` [PATCHv2, RFC 14/30] thp, mm: naive support of thp in generic read/write routines Kirill A. Shutemov
2013-03-15 3:11 ` Hillf Danton
2013-03-15 13:27 ` Kirill A. Shutemov
2013-03-22 15:22 ` Dave Hansen
2013-03-28 12:25 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 15/30] thp, libfs: initial support of thp in simple_read/write_begin/write_end Kirill A. Shutemov
2013-03-22 18:01 ` Dave
2013-03-28 14:29 ` Kirill A. Shutemov
2013-03-14 17:50 ` Kirill A. Shutemov [this message]
2013-03-15 6:15 ` [PATCHv2, RFC 16/30] thp: handle file pages in split_huge_page() Hillf Danton
2013-03-15 13:26 ` Kirill A. Shutemov
2013-03-15 13:33 ` Hillf Danton
2013-03-22 18:18 ` Dave
2013-03-28 14:32 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 17/30] thp: wait_split_huge_page(): serialize over i_mmap_mutex too Kirill A. Shutemov
2013-03-22 18:22 ` Dave
2013-03-28 15:08 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 18/30] thp, mm: truncate support for transparent huge page cache Kirill A. Shutemov
2013-03-22 18:29 ` Dave
2013-03-28 15:31 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 19/30] thp, mm: split huge page on mmap file page Kirill A. Shutemov
2013-03-15 6:58 ` Hillf Danton
2013-03-15 13:29 ` Kirill A. Shutemov
2013-03-15 13:35 ` Hillf Danton
2013-03-15 13:45 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 20/30] ramfs: enable transparent huge page cache Kirill A. Shutemov
2013-04-02 16:28 ` Kirill A. Shutemov
2013-04-02 22:15 ` Hugh Dickins
2013-04-03 1:11 ` Minchan Kim
2013-04-05 6:47 ` Simon Jeons
2013-04-05 8:01 ` Minchan Kim
2013-04-05 8:22 ` Wanpeng Li
[not found] ` <515e89d2.e725320a.3a74.7fe7SMTPIN_ADDED_BROKEN@mx.google.com>
2013-04-05 8:31 ` Minchan Kim
2013-04-05 8:35 ` Wanpeng Li
2013-04-05 13:46 ` Christoph Lameter
2013-04-03 13:53 ` Christoph Lameter
2013-03-14 17:50 ` [PATCHv2, RFC 21/30] x86-64, mm: proper alignment mappings with hugepages Kirill A. Shutemov
2013-03-22 18:37 ` Dave
2013-03-14 17:50 ` [PATCHv2, RFC 22/30] mm: add huge_fault() callback to vm_operations_struct Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 23/30] thp: prepare zap_huge_pmd() to uncharge file pages Kirill A. Shutemov
2013-03-15 7:09 ` Hillf Danton
2013-03-15 13:30 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 24/30] thp: move maybe_pmd_mkwrite() out of mk_huge_pmd() Kirill A. Shutemov
2013-03-15 7:31 ` Hillf Danton
2013-03-14 17:50 ` [PATCHv2, RFC 25/30] thp, mm: basic huge_fault implementation for generic_file_vm_ops Kirill A. Shutemov
2013-03-15 7:44 ` Hillf Danton
2013-03-15 13:30 ` Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 26/30] thp: extract fallback path from do_huge_pmd_anonymous_page() to a function Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 27/30] thp: initial implementation of do_huge_linear_fault() Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 28/30] thp: handle write-protect exception to file-backed huge pages Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 29/30] thp: call __vma_adjust_trans_huge() for file-backed VMA Kirill A. Shutemov
2013-03-14 17:50 ` [PATCHv2, RFC 30/30] thp: map file-backed huge pages on fault Kirill A. Shutemov
2013-03-15 0:33 ` [PATCHv2, RFC 00/30] Transparent huge page cache Hillf Danton
2013-03-15 13:33 ` Kirill A. Shutemov
2013-03-18 4:03 ` Simon Jeons
2013-03-18 5:23 ` Simon Jeons
2013-03-18 11:19 ` Kirill A. Shutemov
2013-03-18 11:29 ` Simon Jeons
2013-03-18 11:42 ` Kirill A. Shutemov
2013-03-18 11:42 ` Ric Mason
2013-03-20 1:09 ` Simon Jeons
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