linux-kernel - [PATCH v2 3/7] memcg: use compound_order rather than hpage_nr

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Date:   Fri, 18 May 2018 13:34:26 +0900
From:   TSUKADA Koutaro <tsukada@...ade.co.jp>
To:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Jonathan Corbet <corbet@....net>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        David Rientjes <rientjes@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        Marc-Andre Lureau <marcandre.lureau@...hat.com>,
        Punit Agrawal <punit.agrawal@....com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org, tsukada@...ade.co.jp
Subject: [PATCH v2 3/7] memcg: use compound_order rather than hpage_nr_pages

The current memcg implementation assumes that the compound page is THP.
In order to be able to charge surplus hugepage, we use compound_order.

Signed-off-by: TSUKADA Koutaro <tsukada@...ade.co.jp>
---
 memcontrol.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 2bd3df3..a8f1ff8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4483,7 +4483,7 @@ static int mem_cgroup_move_account(struct page *page,
 				   struct mem_cgroup *to)
 {
 	unsigned long flags;
-	unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1;
+	unsigned int nr_pages = compound ? (1 << compound_order(page)) : 1;
 	int ret;
 	bool anon;

@@ -5417,7 +5417,7 @@ int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
 			  bool compound)
 {
 	struct mem_cgroup *memcg = NULL;
-	unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1;
+	unsigned int nr_pages = compound ? (1 << compound_order(page)) : 1;
 	int ret = 0;

 	if (mem_cgroup_disabled())
@@ -5478,7 +5478,7 @@ int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
 void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
 			      bool lrucare, bool compound)
 {
-	unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1;
+	unsigned int nr_pages = compound ? (1 << compound_order(page)) : 1;

 	VM_BUG_ON_PAGE(!page->mapping, page);
 	VM_BUG_ON_PAGE(PageLRU(page) && !lrucare, page);
@@ -5522,7 +5522,7 @@ void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
 void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
 		bool compound)
 {
-	unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1;
+	unsigned int nr_pages = compound ? (1 << compound_order(page)) : 1;

 	if (mem_cgroup_disabled())
 		return;
@@ -5729,7 +5729,7 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage)

 	/* Force-charge the new page. The old one will be freed soon */
 	compound = PageTransHuge(newpage);
-	nr_pages = compound ? hpage_nr_pages(newpage) : 1;
+	nr_pages = compound ? (1 << compound_order(newpage)) : 1;

 	page_counter_charge(&memcg->memory, nr_pages);
 	if (do_memsw_account())

-- 
Tsukada