From: Suren Baghdasaryan <surenb@google.com>
To: tj@kernel.org
Cc: hannes@cmpxchg.org, mhocko@kernel.org, vdavydov.dev@gmail.com,
akpm@linux-foundation.org, shakeelb@google.com, guro@fb.com,
songmuchun@bytedance.com, shy828301@gmail.com, alexs@kernel.org,
alexander.h.duyck@linux.intel.com, richard.weiyang@gmail.com,
vbabka@suse.cz, axboe@kernel.dk, iamjoonsoo.kim@lge.com,
david@redhat.com, willy@infradead.org, apopple@nvidia.com,
minchan@kernel.org, linmiaohe@huawei.com,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-mm@kvack.org, kernel-team@android.com, surenb@google.com
Subject: [PATCH 2/3] mm, memcg: inline mem_cgroup_{charge/uncharge} to improve disabled memcg config
Date: Thu, 8 Jul 2021 17:05:08 -0700 [thread overview]
Message-ID: <20210709000509.2618345-3-surenb@google.com> (raw)
In-Reply-To: <20210709000509.2618345-1-surenb@google.com>
Inline mem_cgroup_{charge/uncharge} and mem_cgroup_uncharge_list functions
functions to perform mem_cgroup_disabled static key check inline before
calling the main body of the function. This minimizes the memcg overhead
in the pagefault and exit_mmap paths when memcgs are disabled using
cgroup_disable=memory command-line option.
This change results in ~0.4% overhead reduction when running PFT test
comparing {CONFIG_MEMCG=n} against {CONFIG_MEMCG=y, cgroup_disable=memory}
configurationon on an 8-core ARM64 Android device.
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
include/linux/memcontrol.h | 54 ++++++++++++++++++++++++++++++++++----
mm/memcontrol.c | 43 +++---------------------------
2 files changed, 53 insertions(+), 44 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index bfe5c486f4ad..480815feb116 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -693,13 +693,59 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
page_counter_read(&memcg->memory);
}
-int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
+struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
+
+int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
+ gfp_t gfp);
+/**
+ * mem_cgroup_charge - charge a newly allocated page to a cgroup
+ * @page: page to charge
+ * @mm: mm context of the victim
+ * @gfp_mask: reclaim mode
+ *
+ * Try to charge @page to the memcg that @mm belongs to, reclaiming
+ * pages according to @gfp_mask if necessary. if @mm is NULL, try to
+ * charge to the active memcg.
+ *
+ * Do not use this for pages allocated for swapin.
+ *
+ * Returns 0 on success. Otherwise, an error code is returned.
+ */
+static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
+ gfp_t gfp_mask)
+{
+ struct mem_cgroup *memcg;
+ int ret;
+
+ if (mem_cgroup_disabled())
+ return 0;
+
+ memcg = get_mem_cgroup_from_mm(mm);
+ ret = __mem_cgroup_charge(page, memcg, gfp_mask);
+ css_put(&memcg->css);
+
+ return ret;
+}
+
int mem_cgroup_swapin_charge_page(struct page *page, struct mm_struct *mm,
gfp_t gfp, swp_entry_t entry);
void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry);
-void mem_cgroup_uncharge(struct page *page);
-void mem_cgroup_uncharge_list(struct list_head *page_list);
+void __mem_cgroup_uncharge(struct page *page);
+static inline void mem_cgroup_uncharge(struct page *page)
+{
+ if (mem_cgroup_disabled())
+ return;
+ __mem_cgroup_uncharge(page);
+}
+
+void __mem_cgroup_uncharge_list(struct list_head *page_list);
+static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
+{
+ if (mem_cgroup_disabled())
+ return;
+ __mem_cgroup_uncharge_list(page_list);
+}
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);
@@ -756,8 +802,6 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page)
struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
-struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
-
struct lruvec *lock_page_lruvec(struct page *page);
struct lruvec *lock_page_lruvec_irq(struct page *page);
struct lruvec *lock_page_lruvec_irqsave(struct page *page,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a228cd51c4bd..da677b55b2fe 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6701,8 +6701,8 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
atomic_long_read(&parent->memory.children_low_usage)));
}
-static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
- gfp_t gfp)
+int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
+ gfp_t gfp)
{
unsigned int nr_pages = thp_nr_pages(page);
int ret;
@@ -6722,35 +6722,6 @@ static int __mem_cgroup_charge(struct page *page, struct mem_cgroup *memcg,
return ret;
}
-/**
- * mem_cgroup_charge - charge a newly allocated page to a cgroup
- * @page: page to charge
- * @mm: mm context of the victim
- * @gfp_mask: reclaim mode
- *
- * Try to charge @page to the memcg that @mm belongs to, reclaiming
- * pages according to @gfp_mask if necessary. if @mm is NULL, try to
- * charge to the active memcg.
- *
- * Do not use this for pages allocated for swapin.
- *
- * Returns 0 on success. Otherwise, an error code is returned.
- */
-int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
-{
- struct mem_cgroup *memcg;
- int ret;
-
- if (mem_cgroup_disabled())
- return 0;
-
- memcg = get_mem_cgroup_from_mm(mm);
- ret = __mem_cgroup_charge(page, memcg, gfp_mask);
- css_put(&memcg->css);
-
- return ret;
-}
-
/**
* mem_cgroup_swapin_charge_page - charge a newly allocated page for swapin
* @page: page to charge
@@ -6921,13 +6892,10 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
*
* Uncharge a page previously charged with mem_cgroup_charge().
*/
-void mem_cgroup_uncharge(struct page *page)
+void __mem_cgroup_uncharge(struct page *page)
{
struct uncharge_gather ug;
- if (mem_cgroup_disabled())
- return;
-
/* Don't touch page->lru of any random page, pre-check: */
if (!page_memcg(page))
return;
@@ -6944,14 +6912,11 @@ void mem_cgroup_uncharge(struct page *page)
* Uncharge a list of pages previously charged with
* mem_cgroup_charge().
*/
-void mem_cgroup_uncharge_list(struct list_head *page_list)
+void __mem_cgroup_uncharge_list(struct list_head *page_list)
{
struct uncharge_gather ug;
struct page *page;
- if (mem_cgroup_disabled())
- return;
-
uncharge_gather_clear(&ug);
list_for_each_entry(page, page_list, lru)
uncharge_page(page, &ug);
--
2.32.0.93.g670b81a890-goog
next prev parent reply other threads:[~2021-07-09 0:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-09 0:05 [PATCH 0/3] mm, memcg: Optimizations to minimize overhead when memcgs are disabled Suren Baghdasaryan
2021-07-09 0:05 ` [PATCH 1/3] mm, memcg: add mem_cgroup_disabled checks in vmpressure and swap-related functions Suren Baghdasaryan
2021-07-09 14:41 ` Johannes Weiner
2021-07-09 16:00 ` Shakeel Butt
2021-07-09 0:05 ` Suren Baghdasaryan [this message]
2021-07-09 14:48 ` [PATCH 2/3] mm, memcg: inline mem_cgroup_{charge/uncharge} to improve disabled memcg config Johannes Weiner
2021-07-09 15:18 ` Suren Baghdasaryan
2021-07-09 17:17 ` Suren Baghdasaryan
2021-07-09 0:05 ` [PATCH 3/3] mm, memcg: inline swap-related functions " Suren Baghdasaryan
2021-07-09 14:49 ` Johannes Weiner
2021-07-09 16:05 ` Shakeel Butt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210709000509.2618345-3-surenb@google.com \
--to=surenb@google.com \
--cc=akpm@linux-foundation.org \
--cc=alexander.h.duyck@linux.intel.com \
--cc=alexs@kernel.org \
--cc=apopple@nvidia.com \
--cc=axboe@kernel.dk \
--cc=cgroups@vger.kernel.org \
--cc=david@redhat.com \
--cc=guro@fb.com \
--cc=hannes@cmpxchg.org \
--cc=iamjoonsoo.kim@lge.com \
--cc=kernel-team@android.com \
--cc=linmiaohe@huawei.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=minchan@kernel.org \
--cc=richard.weiyang@gmail.com \
--cc=shakeelb@google.com \
--cc=shy828301@gmail.com \
--cc=songmuchun@bytedance.com \
--cc=tj@kernel.org \
--cc=vbabka@suse.cz \
--cc=vdavydov.dev@gmail.com \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).