From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: cgroups@vger.kernel.org, linux-mm@kvack.org,
"Andrew Morton" <akpm@linux-foundation.org>,
"Michal Hocko" <mhocko@kernel.org>,
"Michal Koutný" <mkoutny@suse.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Vladimir Davydov" <vdavydov.dev@gmail.com>,
"Waiman Long" <longman@redhat.com>,
"kernel test robot" <oliver.sang@intel.com>
Subject: Re: [PATCH v2 4/4] mm/memcg: Protect memcg_stock with a local_lock_t
Date: Thu, 17 Feb 2022 10:28:57 +0100 [thread overview]
Message-ID: <Yg4VWfeCLGFnjQ1W@linutronix.de> (raw)
In-Reply-To: <Yg09t/j5Z0X9L7aX@cmpxchg.org>
On 2022-02-16 13:08:55 [-0500], Johannes Weiner wrote:
> I thought you'd fold it into yours, but separate patch works too,
> thanks!
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Thank you.
> One important note, though:
>
> > @@ -3151,8 +3155,17 @@ static void drain_obj_stock(struct memcg_stock_pcp *stock)
> > unsigned int nr_pages = stock->nr_bytes >> PAGE_SHIFT;
> > unsigned int nr_bytes = stock->nr_bytes & (PAGE_SIZE - 1);
> >
> > - if (nr_pages)
> > - obj_cgroup_uncharge_pages(old, nr_pages);
> > + if (nr_pages) {
> > + struct mem_cgroup *memcg;
> > +
> > + memcg = get_mem_cgroup_from_objcg(old);
> > +
> > + if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
> > + page_counter_uncharge(&memcg->kmem, nr_pages);
> > + __refill_stock(memcg, nr_pages);
>
> This doesn't take "memcg: add per-memcg total kernel memory stat"
> queued in -mm into account and so will break kmem accounting.
>
> Make sure to rebase the patches to the -mm tree before sending it
> out. You can find it here: https://github.com/hnaz/linux-mm
Thank you, rebased on-top.
Sebastian
prev parent reply other threads:[~2022-02-17 9:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-11 22:35 [PATCH v2 0/4] mm/memcg: Address PREEMPT_RT problems instead of disabling it Sebastian Andrzej Siewior
2022-02-11 22:35 ` [PATCH v2 1/4] mm/memcg: Revert ("mm/memcg: optimize user context object stock access") Sebastian Andrzej Siewior
2022-02-14 16:23 ` Johannes Weiner
2022-02-14 19:45 ` Roman Gushchin
2022-02-11 22:35 ` [PATCH v2 2/4] mm/memcg: Disable threshold event handlers on PREEMPT_RT Sebastian Andrzej Siewior
2022-02-14 16:23 ` Johannes Weiner
2022-02-14 19:46 ` Roman Gushchin
2022-02-11 22:35 ` [PATCH v2 3/4] mm/memcg: Protect per-CPU counter by disabling preemption on PREEMPT_RT where needed Sebastian Andrzej Siewior
2022-02-14 16:46 ` Johannes Weiner
2022-02-14 19:53 ` Roman Gushchin
2022-02-15 18:01 ` Sebastian Andrzej Siewior
2022-02-11 22:35 ` [PATCH v2 4/4] mm/memcg: Protect memcg_stock with a local_lock_t Sebastian Andrzej Siewior
2022-02-14 16:23 ` Johannes Weiner
2022-02-16 15:51 ` Sebastian Andrzej Siewior
2022-02-16 18:08 ` Johannes Weiner
2022-02-17 9:28 ` Sebastian Andrzej Siewior [this message]
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