From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Hugh Dickins <hughd@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Christoph Lameter <cl@gentwo.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Jerome Marchand <jmarchan@redhat.com>,
Yang Shi <yang.shi@linaro.org>,
Sasha Levin <sasha.levin@oracle.com>,
Andres Lagar-Cavilla <andreslc@google.com>,
Ning Qu <quning@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv9 05/32] rmap: support file thp
Date: Mon, 6 Jun 2016 17:06:42 +0300 [thread overview]
Message-ID: <1465222029-45942-6-git-send-email-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <1465222029-45942-1-git-send-email-kirill.shutemov@linux.intel.com>
Naive approach: on mapping/unmapping the page as compound we update
->_mapcount on each 4k page. That's not efficient, but it's not obvious
how we can optimize this. We can look into optimization later.
PG_double_map optimization doesn't work for file pages since lifecycle
of file pages is different comparing to anon pages: file page can be
mapped again at any time.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
include/linux/rmap.h | 2 +-
mm/huge_memory.c | 10 +++++++---
mm/memory.c | 4 ++--
mm/migrate.c | 2 +-
mm/rmap.c | 48 +++++++++++++++++++++++++++++++++++-------------
mm/util.c | 6 ++++++
6 files changed, 52 insertions(+), 20 deletions(-)
diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 49eb4f8ebac9..5704f101b52e 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -165,7 +165,7 @@ void do_page_add_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, int);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
unsigned long, bool);
-void page_add_file_rmap(struct page *);
+void page_add_file_rmap(struct page *, bool);
void page_remove_rmap(struct page *, bool);
void hugepage_add_anon_rmap(struct page *, struct vm_area_struct *,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2139096947f3..b117cbc0c800 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3316,18 +3316,22 @@ static void __split_huge_page(struct page *page, struct list_head *list)
int total_mapcount(struct page *page)
{
- int i, ret;
+ int i, compound, ret;
VM_BUG_ON_PAGE(PageTail(page), page);
if (likely(!PageCompound(page)))
return atomic_read(&page->_mapcount) + 1;
- ret = compound_mapcount(page);
+ compound = compound_mapcount(page);
if (PageHuge(page))
- return ret;
+ return compound;
+ ret = compound;
for (i = 0; i < HPAGE_PMD_NR; i++)
ret += atomic_read(&page[i]._mapcount) + 1;
+ /* File pages has compound_mapcount included in _mapcount */
+ if (!PageAnon(page))
+ return ret - compound * HPAGE_PMD_NR;
if (PageDoubleMap(page))
ret -= HPAGE_PMD_NR;
return ret;
diff --git a/mm/memory.c b/mm/memory.c
index 582d12af8768..4bd1078708ba 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1479,7 +1479,7 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
/* Ok, finally just insert the thing.. */
get_page(page);
inc_mm_counter_fast(mm, mm_counter_file(page));
- page_add_file_rmap(page);
+ page_add_file_rmap(page, false);
set_pte_at(mm, addr, pte, mk_pte(page, prot));
retval = 0;
@@ -2950,7 +2950,7 @@ int alloc_set_pte(struct fault_env *fe, struct mem_cgroup *memcg,
lru_cache_add_active_or_unevictable(page, vma);
} else {
inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page));
- page_add_file_rmap(page);
+ page_add_file_rmap(page, false);
}
set_pte_at(vma->vm_mm, fe->address, fe->pte, entry);
diff --git a/mm/migrate.c b/mm/migrate.c
index 9baf41c877ff..7fbca48903df 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -170,7 +170,7 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
} else if (PageAnon(new))
page_add_anon_rmap(new, vma, addr, false);
else
- page_add_file_rmap(new);
+ page_add_file_rmap(new, false);
if (vma->vm_flags & VM_LOCKED && !PageTransCompound(new))
mlock_vma_page(new);
diff --git a/mm/rmap.c b/mm/rmap.c
index 0ea5d9071b32..b78374519bac 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1273,18 +1273,34 @@ void page_add_new_anon_rmap(struct page *page,
*
* The caller needs to hold the pte lock.
*/
-void page_add_file_rmap(struct page *page)
+void page_add_file_rmap(struct page *page, bool compound)
{
+ int i, nr = 1;
+
+ VM_BUG_ON_PAGE(compound && !PageTransHuge(page), page);
lock_page_memcg(page);
- if (atomic_inc_and_test(&page->_mapcount)) {
- __inc_zone_page_state(page, NR_FILE_MAPPED);
- mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
+ if (compound && PageTransHuge(page)) {
+ for (i = 0, nr = 0; i < HPAGE_PMD_NR; i++) {
+ if (atomic_inc_and_test(&page[i]._mapcount))
+ nr++;
+ }
+ if (!atomic_inc_and_test(compound_mapcount_ptr(page)))
+ goto out;
+ } else {
+ if (!atomic_inc_and_test(&page->_mapcount))
+ goto out;
}
+ __mod_zone_page_state(page_zone(page), NR_FILE_MAPPED, nr);
+ mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
+out:
unlock_page_memcg(page);
}
-static void page_remove_file_rmap(struct page *page)
+static void page_remove_file_rmap(struct page *page, bool compound)
{
+ int i, nr = 1;
+
+ VM_BUG_ON_PAGE(compound && !PageTransHuge(page), page);
lock_page_memcg(page);
/* Hugepages are not counted in NR_FILE_MAPPED for now. */
@@ -1295,15 +1311,24 @@ static void page_remove_file_rmap(struct page *page)
}
/* page still mapped by someone else? */
- if (!atomic_add_negative(-1, &page->_mapcount))
- goto out;
+ if (compound && PageTransHuge(page)) {
+ for (i = 0, nr = 0; i < HPAGE_PMD_NR; i++) {
+ if (atomic_add_negative(-1, &page[i]._mapcount))
+ nr++;
+ }
+ if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
+ goto out;
+ } else {
+ if (!atomic_add_negative(-1, &page->_mapcount))
+ goto out;
+ }
/*
* We use the irq-unsafe __{inc|mod}_zone_page_stat because
* these counters are not modified in interrupt context, and
* pte lock(a spinlock) is held, which implies preemption disabled.
*/
- __dec_zone_page_state(page, NR_FILE_MAPPED);
+ __mod_zone_page_state(page_zone(page), NR_FILE_MAPPED, -nr);
mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
if (unlikely(PageMlocked(page)))
@@ -1359,11 +1384,8 @@ static void page_remove_anon_compound_rmap(struct page *page)
*/
void page_remove_rmap(struct page *page, bool compound)
{
- if (!PageAnon(page)) {
- VM_BUG_ON_PAGE(compound && !PageHuge(page), page);
- page_remove_file_rmap(page);
- return;
- }
+ if (!PageAnon(page))
+ return page_remove_file_rmap(page, compound);
if (compound)
return page_remove_anon_compound_rmap(page);
diff --git a/mm/util.c b/mm/util.c
index 917e0e3d0f8e..d73b323eb362 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -410,6 +410,12 @@ int __page_mapcount(struct page *page)
int ret;
ret = atomic_read(&page->_mapcount) + 1;
+ /*
+ * For file THP page->_mapcount contains total number of mapping
+ * of the page: no need to look into compound_mapcount.
+ */
+ if (!PageAnon(page) && !PageHuge(page))
+ return ret;
page = compound_head(page);
ret += atomic_read(compound_mapcount_ptr(page)) + 1;
if (PageDoubleMap(page))
--
2.8.1
next prev parent reply other threads:[~2016-06-06 14:08 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-06 14:06 [PATCHv9 00/32] THP-enabled tmpfs/shmem using compound pages Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 01/32] thp, mlock: update unevictable-lru.txt Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 02/32] mm: do not pass mm_struct into handle_mm_fault Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 03/32] mm: introduce fault_env Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 04/32] mm: postpone page table allocation until we have page to map Kirill A. Shutemov
2016-06-06 14:06 ` Kirill A. Shutemov [this message]
2016-06-06 14:06 ` [PATCHv9 06/32] mm: introduce do_set_pmd() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 07/32] thp, vmstats: add counters for huge file pages Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 08/32] thp: support file pages in zap_huge_pmd() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 09/32] thp: handle file pages in split_huge_pmd() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 10/32] thp: handle file COW faults Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 11/32] thp: skip file huge pmd on copy_huge_pmd() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 12/32] thp: prepare change_huge_pmd() for file thp Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 13/32] thp: run vma_adjust_trans_huge() outside i_mmap_rwsem Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 14/32] thp: file pages support for split_huge_page() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 15/32] thp, mlock: do not mlock PTE-mapped file huge pages Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 16/32] vmscan: split file huge pages before paging them out Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 17/32] page-flags: relax policy for PG_mappedtodisk and PG_reclaim Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 18/32] radix-tree: implement radix_tree_maybe_preload_order() Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 19/32] filemap: prepare find and delete operations for huge pages Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 20/32] truncate: handle file thp Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 21/32] mm, rmap: account shmem thp pages Kirill A. Shutemov
2016-06-06 14:06 ` [PATCHv9 22/32] shmem: prepare huge= mount option and sysfs knob Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 23/32] shmem: get_unmapped_area align huge page Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 24/32] shmem: add huge pages support Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 25/32] shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 26/32] thp: extract khugepaged from mm/huge_memory.c Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 27/32] khugepaged: move up_read(mmap_sem) out of khugepaged_alloc_page() Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 28/32] shmem: make shmem_inode_info::lock irq-safe Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 29/32] khugepaged: add support of collapse for tmpfs/shmem pages Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 30/32] thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 31/32] shmem: split huge pages beyond i_size under memory pressure Kirill A. Shutemov
2016-06-06 14:07 ` [PATCHv9 32/32] thp: update Documentation/{vm/transhuge,filesystems/proc}.txt Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 00/32] THP-enabled tmpfs/shmem using compound pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 01/32] thp, mlock: update unevictable-lru.txt Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 02/32] mm: do not pass mm_struct into handle_mm_fault Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 03/32] mm: introduce fault_env Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 04/32] mm: postpone page table allocation until we have page to map Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 05/32] rmap: support file thp Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 06/32] mm: introduce do_set_pmd() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 07/32] thp, vmstats: add counters for huge file pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 08/32] thp: support file pages in zap_huge_pmd() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 09/32] thp: handle file pages in split_huge_pmd() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 10/32] thp: handle file COW faults Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 11/32] thp: skip file huge pmd on copy_huge_pmd() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 12/32] thp: prepare change_huge_pmd() for file thp Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 13/32] thp: run vma_adjust_trans_huge() outside i_mmap_rwsem Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 14/32] thp: file pages support for split_huge_page() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 15/32] thp, mlock: do not mlock PTE-mapped file huge pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 16/32] vmscan: split file huge pages before paging them out Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 17/32] page-flags: relax policy for PG_mappedtodisk and PG_reclaim Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 18/32] radix-tree: implement radix_tree_maybe_preload_order() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 19/32] filemap: prepare find and delete operations for huge pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 20/32] truncate: handle file thp Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 21/32] mm, rmap: account shmem thp pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 22/32] shmem: prepare huge= mount option and sysfs knob Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 23/32] shmem: get_unmapped_area align huge page Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 24/32] shmem: add huge pages support Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 25/32] shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 26/32] thp: extract khugepaged from mm/huge_memory.c Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 27/32] khugepaged: move up_read(mmap_sem) out of khugepaged_alloc_page() Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 28/32] shmem: make shmem_inode_info::lock irq-safe Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 29/32] khugepaged: add support of collapse for tmpfs/shmem pages Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 30/32] thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 31/32] shmem: split huge pages beyond i_size under memory pressure Kirill A. Shutemov
2016-06-07 11:00 ` [PATCHv9-rebased 32/32] thp: update Documentation/{vm/transhuge,filesystems/proc}.txt Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 00/37] THP-enabled tmpfs/shmem using compound pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 01/37] mm, thp: make swapin readahead under down_read of mmap_sem Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 02/37] mm-thp-make-swapin-readahead-under-down_read-of-mmap_sem-fix Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 03/37] mm, thp: fix locking inconsistency in collapse_huge_page Kirill A. Shutemov
2016-06-16 0:43 ` Sergey Senozhatsky
2016-06-16 8:02 ` Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 04/37] mm-thp-make-swapin-readahead-under-down_read-of-mmap_sem-fix-2-fix Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 05/37] khugepaged: recheck pmd after mmap_sem re-acquired Kirill A. Shutemov
2016-06-16 11:47 ` Ebru Akagunduz
2016-06-16 11:51 ` Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 06/37] thp, mlock: update unevictable-lru.txt Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 07/37] mm: do not pass mm_struct into handle_mm_fault Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 08/37] mm: introduce fault_env Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 09/37] mm: postpone page table allocation until we have page to map Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 10/37] rmap: support file thp Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 11/37] mm: introduce do_set_pmd() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 12/37] thp, vmstats: add counters for huge file pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 13/37] thp: support file pages in zap_huge_pmd() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 14/37] thp: handle file pages in split_huge_pmd() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 15/37] thp: handle file COW faults Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 16/37] thp: skip file huge pmd on copy_huge_pmd() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 17/37] thp: prepare change_huge_pmd() for file thp Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 18/37] thp: run vma_adjust_trans_huge() outside i_mmap_rwsem Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 19/37] thp: file pages support for split_huge_page() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 20/37] thp, mlock: do not mlock PTE-mapped file huge pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 21/37] vmscan: split file huge pages before paging them out Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 22/37] page-flags: relax policy for PG_mappedtodisk and PG_reclaim Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 23/37] radix-tree: implement radix_tree_maybe_preload_order() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 24/37] filemap: prepare find and delete operations for huge pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 25/37] truncate: handle file thp Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 26/37] mm, rmap: account shmem thp pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 27/37] shmem: prepare huge= mount option and sysfs knob Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 28/37] shmem: get_unmapped_area align huge page Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 29/37] shmem: add huge pages support Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 30/37] shmem, thp: respect MADV_{NO,}HUGEPAGE for file mappings Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 31/37] thp: extract khugepaged from mm/huge_memory.c Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 32/37] khugepaged: move up_read(mmap_sem) out of khugepaged_alloc_page() Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 33/37] shmem: make shmem_inode_info::lock irq-safe Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 34/37] khugepaged: add support of collapse for tmpfs/shmem pages Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 35/37] thp: introduce CONFIG_TRANSPARENT_HUGE_PAGECACHE Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 36/37] shmem: split huge pages beyond i_size under memory pressure Kirill A. Shutemov
2016-06-15 20:06 ` [PATCHv9-rebased2 37/37] thp: update Documentation/{vm/transhuge,filesystems/proc}.txt Kirill A. Shutemov
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