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Tue, 16 Mar 2021 08:50:28 -0700 (PDT) MIME-Version: 1.0 References: <20210316153655.500806-1-schatzberg.dan@gmail.com> <20210316153655.500806-3-schatzberg.dan@gmail.com> In-Reply-To: <20210316153655.500806-3-schatzberg.dan@gmail.com> From: Shakeel Butt Date: Tue, 16 Mar 2021 08:50:16 -0700 Message-ID: Subject: Re: [PATCH 2/3] mm: Charge active memcg when no mm is set To: Dan Schatzberg Cc: Jens Axboe , Tejun Heo , Zefan Li , Johannes Weiner , Andrew Morton , Michal Hocko , Vladimir Davydov , Hugh Dickins , Roman Gushchin , Muchun Song , Alex Shi , Alexander Duyck , Chris Down , Yafang Shao , Wei Yang , "open list:BLOCK LAYER" , open list , "open list:CONTROL GROUP (CGROUP)" , "open list:MEMORY MANAGEMENT" Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 9EB5D20003B9 X-Stat-Signature: xbb5jtpsxbji1xed6ywrjijs1zbedrt9 Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=mail-lf1-f46.google.com; client-ip=209.85.167.46 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615909830-903155 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Mar 16, 2021 at 8:37 AM Dan Schatzberg wrote: > > memalloc_use_memcg() worked for kernel allocations but was silently > ignored for user pages. set_active_memcg() > > 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. It's a bit more sophisticated than current->active_memcg. It has been extended to work in interrupt context as well. > > Previously, if a NULL mm was passed to mem_cgroup_try_charge (case 3) it mem_cgroup_charge() > 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 > Acked-by: Johannes Weiner > Acked-by: Tejun Heo > Acked-by: Chris Down > Reviewed-by: Shakeel Butt > --- > mm/filemap.c | 2 +- > mm/memcontrol.c | 14 +++++++++++--- > mm/shmem.c | 4 ++-- > 3 files changed, 14 insertions(+), 6 deletions(-) > > diff --git a/mm/filemap.c b/mm/filemap.c > index 43700480d897..5135f330f05c 100644 > --- a/mm/filemap.c > +++ b/mm/filemap.c > @@ -843,7 +843,7 @@ noinline int __add_to_page_cache_locked(struct page *page, > page->index = offset; > > if (!huge) { > - error = mem_cgroup_charge(page, current->mm, gfp); > + error = mem_cgroup_charge(page, NULL, gfp); > if (error) > goto error; > charged = true; > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index e064ac0d850a..9a1b23ed3412 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -6690,7 +6690,8 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root, > * @gfp_mask: reclaim mode > * > * Try to charge @page to the memcg that @mm belongs to, reclaiming > - * pages according to @gfp_mask if necessary. > + * pages according to @gfp_mask if necessary. if @mm is NULL, try to > + * charge to the active memcg. > * > * Returns 0 on success. Otherwise, an error code is returned. > */ > @@ -6726,8 +6727,15 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask) > rcu_read_unlock(); > } > > - if (!memcg) > - memcg = get_mem_cgroup_from_mm(mm); > + if (!memcg) { > + if (!mm) { > + memcg = get_mem_cgroup_from_current(); > + if (!memcg) > + memcg = get_mem_cgroup_from_mm(current->mm); > + } else { > + memcg = get_mem_cgroup_from_mm(mm); > + } > + } You will need to rebase to the latest mm tree. This code has changed.