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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-07-26 15:25:26 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-26 16:19:19 -0700 |
| commit | dd78fedde4b99b322f2dc849d467d365a82e23ca (patch) | |
| tree | 5095c6e9fd2527a8636188059e35f7f45b9648a2 /mm/memory.c | |
| parent | 7267ec008b5cd8b3579e188b1ff238815643e372 (diff) | |
| download | linux-stable-dd78fedde4b99b322f2dc849d467d365a82e23ca.tar.gz linux-stable-dd78fedde4b99b322f2dc849d467d365a82e23ca.tar.bz2 linux-stable-dd78fedde4b99b322f2dc849d467d365a82e23ca.zip | |
rmap: support file thp
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.
Link: http://lkml.kernel.org/r/1466021202-61880-11-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c index 1991105bf67c..30cda24ff205 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1494,7 +1494,7 @@ 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; @@ -2962,7 +2962,7 @@ 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); |