From: Dan Schatzberg <schatzberg.dan@gmail.com>
To: Hugh Dickins <hughd@google.com>
Cc: Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
Chris Down <chris@chrisdown.name>,
Yang Shi <yang.shi@linux.alibaba.com>,
Thomas Gleixner <tglx@linutronix.de>,
"open list:BLOCK LAYER" <linux-block@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:CONTROL GROUP (CGROUP)" <cgroups@vger.kernel.org>,
"open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)"
<linux-mm@kvack.org>
Subject: Re: [PATCH v3 2/3] mm: Charge active memcg when no mm is set
Date: Mon, 24 Feb 2020 16:37:50 -0500 [thread overview]
Message-ID: <20200224213750.GA3773@dschatzberg-fedora-PC0Y6AEN.dhcp.thefacebook.com> (raw)
In-Reply-To: <alpine.LSU.2.11.2002231710420.7354@eggly.anvils>
On Sun, Feb 23, 2020 at 05:11:12PM -0800, Hugh Dickins wrote:
> On Sun, 23 Feb 2020, Hugh Dickins wrote:
> > On Thu, 20 Feb 2020, Dan Schatzberg wrote:
> >
> > > memalloc_use_memcg() worked for kernel allocations but was silently
> > > ignored for user pages.
> > >
> > > This patch establishes a precedence order for who gets charged:
> > >
> > > 1. If there is a memcg associated with the page already, that memcg is
> > > charged. This happens during swapin.
> > >
> > > 2. If an explicit mm is passed, mm->memcg is charged. This happens
> > > during page faults, which can be triggered in remote VMs (eg gup).
> > >
> > > 3. Otherwise consult the current process context. If it has configured
> > > a current->active_memcg, use that. Otherwise, current->mm->memcg.
> > >
> > > Previously, if a NULL mm was passed to mem_cgroup_try_charge (case 3) it
> > > would always charge the root cgroup. Now it looks up the current
> > > active_memcg first (falling back to charging the root cgroup if not
> > > set).
> > >
> > > Signed-off-by: Dan Schatzberg <schatzberg.dan@gmail.com>
> > > Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> > > Acked-by: Tejun Heo <tj@kernel.org>
> >
> > Acked-by: Hugh Dickins <hughd@google.com>
> >
> > Yes, internally we have some further not-yet-upstreamed complications
> > here (mainly, the "memcg=" mount option for all charges on a tmpfs to
> > be charged to that memcg); but what you're doing here does not obstruct
> > adding that later, they fit in well with the hierarchy that you (and
> > Johannes) mapped out above, and it's really an improvement for shmem
> > not to be referring to current there - thanks.
>
> I acked slightly too soon. There are two other uses of "try_charge" in
> mm/shmem.c: we can be confident that the userfaultfd one knows what mm
> it's dealing with, but the shmem_swapin_page() instance has a similar
> use of current->mm, that you also want to adjust to NULL, don't you?
>
> Hugh
Yes, you're right. I'll change shmem_swapin_page as well
next prev parent reply other threads:[~2020-02-24 21:37 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 16:51 [PATCH v3 0/3] Charge loop device i/o to issuing cgroup Dan Schatzberg
2020-02-20 16:51 ` [PATCH v3 1/3] loop: Use worker per cgroup instead of kworker Dan Schatzberg
2020-02-20 17:50 ` Johannes Weiner
2020-02-20 22:00 ` Johannes Weiner
2020-02-20 16:51 ` [PATCH v3 2/3] mm: Charge active memcg when no mm is set Dan Schatzberg
2020-02-20 18:14 ` Shakeel Butt
2020-02-20 21:03 ` Johannes Weiner
2020-02-20 21:14 ` Shakeel Butt
2020-02-20 18:35 ` Chris Down
2020-02-20 21:15 ` Shakeel Butt
2020-02-23 19:08 ` Hugh Dickins
2020-02-24 1:11 ` Hugh Dickins
2020-02-24 21:37 ` Dan Schatzberg [this message]
2020-02-20 16:51 ` [PATCH v3 3/3] loop: Charge i/o to mem and blk cg Dan Schatzberg
2020-02-20 22:02 ` Johannes Weiner
2020-02-24 22:17 [PATCH v3 0/3] Charge loop device i/o to issuing cgroup Dan Schatzberg
2020-02-24 22:17 ` [PATCH v3 2/3] mm: Charge active memcg when no mm is set Dan Schatzberg
2020-02-24 22:26 ` Hugh Dickins
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