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Tue, 04 May 2021 13:02:15 -0700 (PDT) From: Waiman Long X-Google-Original-From: Waiman Long Subject: Re: [PATCH v2 1/2] mm: memcg/slab: Properly set up gfp flags for objcg pointer array To: Shakeel Butt Cc: Johannes Weiner , Michal Hocko , Vladimir Davydov , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , Roman Gushchin , LKML , Cgroups , Linux MM References: <20210504132350.4693-1-longman@redhat.com> <20210504132350.4693-2-longman@redhat.com> Message-ID: <267501a0-f416-4058-70d3-e32eeec3d6da@redhat.com> Date: Tue, 4 May 2021 16:02:14 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.9.0 MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Rspamd-Queue-Id: 8B689FD Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=P9bdSKVD; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf20.hostedemail.com: domain of llong@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=llong@redhat.com X-Rspamd-Server: rspam04 X-Stat-Signature: w8odcpwyfa4yqf91aejg5sh956zd9f56 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=170.10.133.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620158531-490007 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 5/4/21 3:37 PM, Shakeel Butt wrote: > On Tue, May 4, 2021 at 6:24 AM Waiman Long wrote: >> Since the merging of the new slab memory controller in v5.9, the page >> structure may store a pointer to obj_cgroup pointer array for slab pages. >> Currently, only the __GFP_ACCOUNT bit is masked off. However, the array >> is not readily reclaimable and doesn't need to come from the DMA buffer. >> So those GFP bits should be masked off as well. >> >> Do the flag bit clearing at memcg_alloc_page_obj_cgroups() to make sure >> that it is consistently applied no matter where it is called. >> >> Fixes: 286e04b8ed7a ("mm: memcg/slab: allocate obj_cgroups for non-root slab pages") >> Signed-off-by: Waiman Long >> --- >> mm/memcontrol.c | 8 ++++++++ >> mm/slab.h | 1 - >> 2 files changed, 8 insertions(+), 1 deletion(-) >> >> diff --git a/mm/memcontrol.c b/mm/memcontrol.c >> index c100265dc393..5e3b4f23b830 100644 >> --- a/mm/memcontrol.c >> +++ b/mm/memcontrol.c >> @@ -2863,6 +2863,13 @@ static struct mem_cgroup *get_mem_cgroup_from_objcg(struct obj_cgroup *objcg) >> } >> >> #ifdef CONFIG_MEMCG_KMEM >> +/* >> + * The allocated objcg pointers array is not accounted directly. >> + * Moreover, it should not come from DMA buffer and is not readily >> + * reclaimable. So those GFP bits should be masked off. >> + */ >> +#define OBJCGS_CLEAR_MASK (__GFP_DMA | __GFP_RECLAIMABLE | __GFP_ACCOUNT) > What about __GFP_DMA32? Does it matter? It seems like DMA32 requests > go to normal caches. I included __GFP_DMA32 in my first draft patch. However, __GFP_DMA32 is not considered in determining the right kmalloc_type() (patch 2), so I took it out to make it consistent. I can certainly add it back. Cheers, Longman