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mm, rmap: account shmem thp pages

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Let's add ShmemHugePages and ShmemPmdMapped fields into meminfo and
smaps.  It indicates how many times we allocate and map shmem THP.

NR_ANON_TRANSPARENT_HUGEPAGES is renamed to NR_ANON_THPS.

Link: http://lkml.kernel.org/r/1466021202-61880-27-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>
This commit is contained in:
Kirill A. Shutemov
2016-07-26 15:26:10 -07:00
committed by Linus Torvalds
parent fc127da085
commit 65c453778a
8 changed files with 58 additions and 15 deletions
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mm/rmap.c
+8 -6
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@@ -1212,10 +1212,8 @@ void do_page_add_anon_rmap(struct page *page,
* pte lock(a spinlock) is held, which implies preemption
* disabled.
*/
if (compound) {
__inc_zone_page_state(page,
NR_ANON_TRANSPARENT_HUGEPAGES);
}
if (compound)
__inc_zone_page_state(page, NR_ANON_THPS);
__mod_zone_page_state(page_zone(page), NR_ANON_PAGES, nr);
}
if (unlikely(PageKsm(page)))
@@ -1253,7 +1251,7 @@ void page_add_new_anon_rmap(struct page *page,
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
/* increment count (starts at -1) */
atomic_set(compound_mapcount_ptr(page), 0);
__inc_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__inc_zone_page_state(page, NR_ANON_THPS);
} else {
/* Anon THP always mapped first with PMD */
VM_BUG_ON_PAGE(PageTransCompound(page), page);
@@ -1283,6 +1281,8 @@ void page_add_file_rmap(struct page *page, bool compound)
}
if (!atomic_inc_and_test(compound_mapcount_ptr(page)))
goto out;
VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
__inc_zone_page_state(page, NR_SHMEM_PMDMAPPED);
} else {
if (PageTransCompound(page)) {
VM_BUG_ON_PAGE(!PageLocked(page), page);
@@ -1321,6 +1321,8 @@ static void page_remove_file_rmap(struct page *page, bool compound)
}
if (!atomic_add_negative(-1, compound_mapcount_ptr(page)))
goto out;
VM_BUG_ON_PAGE(!PageSwapBacked(page), page);
__dec_zone_page_state(page, NR_SHMEM_PMDMAPPED);
} else {
if (!atomic_add_negative(-1, &page->_mapcount))
goto out;
@@ -1354,7 +1356,7 @@ static void page_remove_anon_compound_rmap(struct page *page)
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
return;
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__dec_zone_page_state(page, NR_ANON_THPS);
if (TestClearPageDoubleMap(page)) {
/*