From: Michal Hocko <mhocko@suse.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Muchun Song <songmuchun@bytedance.com>,
guro@fb.com, akpm@linux-foundation.org, shakeelb@google.com,
vdavydov.dev@gmail.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, duanxiongchun@bytedance.com,
fam.zheng@bytedance.com
Subject: Re: [External] Re: [PATCH 4/7] mm: memcontrol: simplify lruvec_holds_page_lru_lock
Date: Thu, 15 Apr 2021 09:08:32 +0200 [thread overview]
Message-ID: <YHfmcLLbW6MMbcPG@dhcp22.suse.cz> (raw)
In-Reply-To: <YHcrRMsmrXd5n3oQ@cmpxchg.org>
On Wed 14-04-21 13:49:56, Johannes Weiner wrote:
> On Wed, Apr 14, 2021 at 06:00:42PM +0800, Muchun Song wrote:
> > On Wed, Apr 14, 2021 at 5:44 PM Michal Hocko <mhocko@suse.com> wrote:
> > >
> > > On Tue 13-04-21 14:51:50, Muchun Song wrote:
> > > > We already have a helper lruvec_memcg() to get the memcg from lruvec, we
> > > > do not need to do it ourselves in the lruvec_holds_page_lru_lock(). So use
> > > > lruvec_memcg() instead. And if mem_cgroup_disabled() returns false, the
> > > > page_memcg(page) (the LRU pages) cannot be NULL. So remove the odd logic
> > > > of "memcg = page_memcg(page) ? : root_mem_cgroup". And use lruvec_pgdat
> > > > to simplify the code. We can have a single definition for this function
> > > > that works for !CONFIG_MEMCG, CONFIG_MEMCG + mem_cgroup_disabled() and
> > > > CONFIG_MEMCG.
> > >
> > > Neat. While you are at it wouldn't it make sesne to rename the function
> > > as well. I do not want to bikeshed but this is really a misnomer. it
> > > doesn't check anything about locking. page_belongs_lruvec?
> >
> > Right. lruvec_holds_page_lru_lock is used to check whether
> > the page belongs to the lruvec. page_belongs_lruvec
> > obviously more clearer. I can rename it to
> > page_belongs_lruvec the next version.
>
> This sounds strange to me, I think 'belongs' needs a 'to' to be
> correct, so page_belongs_to_lruvec(). Still kind of a mouthful.
>
> page_matches_lruvec()?
>
> page_from_lruvec()?
Any of those is much better than what we have here.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2021-04-15 7:08 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 6:51 [PATCH 0/7] memcontrol code cleanup and simplification Muchun Song
2021-04-13 6:51 ` [PATCH 1/7] mm: memcontrol: fix page charging in page replacement Muchun Song
2021-04-13 17:45 ` Roman Gushchin
2021-04-14 9:20 ` Michal Hocko
2021-04-13 6:51 ` [PATCH 2/7] mm: memcontrol: bail out early when !mm in get_mem_cgroup_from_mm Muchun Song
2021-04-13 17:47 ` Roman Gushchin
2021-04-14 9:24 ` Michal Hocko
2021-04-14 10:04 ` [External] " Muchun Song
2021-04-14 10:15 ` Michal Hocko
2021-04-15 3:13 ` Muchun Song
2021-04-15 7:09 ` Michal Hocko
2021-04-13 6:51 ` [PATCH 3/7] mm: memcontrol: remove the pgdata parameter of mem_cgroup_page_lruvec Muchun Song
2021-04-13 13:12 ` Shakeel Butt
2021-04-13 17:48 ` Roman Gushchin
2021-04-14 9:27 ` Michal Hocko
2021-04-13 6:51 ` [PATCH 4/7] mm: memcontrol: simplify lruvec_holds_page_lru_lock Muchun Song
2021-04-13 13:28 ` Shakeel Butt
2021-04-13 17:57 ` Roman Gushchin
2021-04-14 9:44 ` Michal Hocko
2021-04-14 10:00 ` [External] " Muchun Song
2021-04-14 17:49 ` Johannes Weiner
2021-04-15 7:08 ` Michal Hocko [this message]
2021-04-15 10:01 ` Muchun Song
2021-04-13 6:51 ` [PATCH 5/7] mm: memcontrol: simplify the logic of objcg pinning memcg Muchun Song
2021-04-13 14:16 ` Shakeel Butt
2021-04-13 17:51 ` Roman Gushchin
2021-04-13 6:51 ` [PATCH 6/7] mm: memcontrol: move obj_cgroup_uncharge_pages() out of css_set_lock Muchun Song
2021-04-13 14:18 ` Shakeel Butt
2021-04-13 17:54 ` Roman Gushchin
2021-04-13 18:03 ` Johannes Weiner
2021-04-13 6:51 ` [PATCH 7/7] mm: vmscan: remove noinline_for_stack Muchun Song
2021-04-14 9:46 ` Michal Hocko
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=YHfmcLLbW6MMbcPG@dhcp22.suse.cz \
--to=mhocko@suse.com \
--cc=akpm@linux-foundation.org \
--cc=duanxiongchun@bytedance.com \
--cc=fam.zheng@bytedance.com \
--cc=guro@fb.com \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=shakeelb@google.com \
--cc=songmuchun@bytedance.com \
--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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.