From: Muchun Song <songmuchun@bytedance.com>
To: hannes@cmpxchg.org, mhocko@kernel.org, vdavydov.dev@gmail.com,
akpm@linux-foundation.org
Cc: cgroups@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH] mm/memcontrol: make the slab calculation consistent
Date: Wed, 2 Dec 2020 20:14:34 +0800 [thread overview]
Message-ID: <20201202121434.75099-1-songmuchun@bytedance.com> (raw)
Although the ratio of the slab is one, we also should read the ratio
from the related memory_stats instead of hard-coding. And the local
variable of size is already the value of slab_unreclaimable. So we
do not need to read again. Simplify the code here.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
mm/memcontrol.c | 22 +++++++++++++++++-----
1 file changed, 17 insertions(+), 5 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9922f1510956..03a9c64560f6 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1545,12 +1545,22 @@ static int __init memory_stats_init(void)
int i;
for (i = 0; i < ARRAY_SIZE(memory_stats); i++) {
+ switch (memory_stats[i].idx) {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (memory_stats[i].idx == NR_ANON_THPS ||
- memory_stats[i].idx == NR_FILE_THPS ||
- memory_stats[i].idx == NR_SHMEM_THPS)
+ case NR_ANON_THPS:
+ case NR_FILE_THPS:
+ case NR_SHMEM_THPS:
memory_stats[i].ratio = HPAGE_PMD_SIZE;
+ break;
#endif
+ case NR_SLAB_UNRECLAIMABLE_B:
+ VM_BUG_ON(i < 1);
+ VM_BUG_ON(memory_stats[i - 1].idx != NR_SLAB_RECLAIMABLE_B);
+ break;
+ default:
+ break;
+ }
+
VM_BUG_ON(!memory_stats[i].ratio);
VM_BUG_ON(memory_stats[i].idx >= MEMCG_NR_STAT);
}
@@ -1587,8 +1597,10 @@ static char *memory_stat_format(struct mem_cgroup *memcg)
seq_buf_printf(&s, "%s %llu\n", memory_stats[i].name, size);
if (unlikely(memory_stats[i].idx == NR_SLAB_UNRECLAIMABLE_B)) {
- size = memcg_page_state(memcg, NR_SLAB_RECLAIMABLE_B) +
- memcg_page_state(memcg, NR_SLAB_UNRECLAIMABLE_B);
+ int idx = i - 1;
+
+ size += memcg_page_state(memcg, memory_stats[idx].idx) *
+ memory_stats[idx].ratio;
seq_buf_printf(&s, "slab %llu\n", size);
}
}
--
2.11.0
next reply other threads:[~2020-12-02 12:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 12:14 Muchun Song [this message]
2020-12-02 21:16 ` [PATCH] mm/memcontrol: make the slab calculation consistent Roman Gushchin
2020-12-03 2:53 ` [External] " Muchun Song
2020-12-03 3:20 ` Roman Gushchin
2020-12-03 3:36 ` Muchun Song
2020-12-03 3:49 ` Roman Gushchin
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=20201202121434.75099-1-songmuchun@bytedance.com \
--to=songmuchun@bytedance.com \
--cc=akpm@linux-foundation.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=vdavydov.dev@gmail.com \
/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).