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[37.188.247.35]) by smtp.gmail.com with ESMTPSA id 9sm17160750wmo.38.2020.03.13.07.56.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 Mar 2020 07:56:21 -0700 (PDT) Date: Fri, 13 Mar 2020 15:56:19 +0100 From: Michal Hocko To: Baoquan He Cc: linux-kernel@vger.kernel.org, willy@infradead.org, linux-mm@kvack.org, akpm@linux-foundation.org, david@redhat.com, richard.weiyang@gmail.com Subject: Re: [PATCH v3] mm/sparse.c: Use kvmalloc_node/kvfree to alloc/free memmap for the classic sparse Message-ID: <20200313145619.GD21007@dhcp22.suse.cz> References: <20200312130822.6589-1-bhe@redhat.com> <20200312141749.GL27711@MiWiFi-R3L-srv> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200312141749.GL27711@MiWiFi-R3L-srv> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu 12-03-20 22:17:49, Baoquan He wrote: > This change makes populate_section_memmap()/depopulate_section_memmap > much simpler. Not only and you should make it more explicit. It also tries to allocate memmaps from the target numa node so this is a functional change. I would prefer to have that in a separate patch in case we hit some weird NUMA setups which would choke on memory less nodes and similar horrors. > Suggested-by: Michal Hocko > Signed-off-by: Baoquan He I do not see any reason this shouldn't work. Btw. did you get to test it? Feel free to add Acked-by: Michal Hocko to both patches if you go and split. > --- > v2->v3: > Remove __GFP_NOWARN and use array_size when calling kvmalloc_node() > per Matthew's comments. > > mm/sparse.c | 27 +++------------------------ > 1 file changed, 3 insertions(+), 24 deletions(-) > > diff --git a/mm/sparse.c b/mm/sparse.c > index bf6c00a28045..bb99633575b5 100644 > --- a/mm/sparse.c > +++ b/mm/sparse.c > @@ -734,35 +734,14 @@ static void free_map_bootmem(struct page *memmap) > struct page * __meminit populate_section_memmap(unsigned long pfn, > unsigned long nr_pages, int nid, struct vmem_altmap *altmap) > { > - struct page *page, *ret; > - unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; > - > - page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); > - if (page) > - goto got_map_page; > - > - ret = vmalloc(memmap_size); > - if (ret) > - goto got_map_ptr; > - > - return NULL; > -got_map_page: > - ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); > -got_map_ptr: > - > - return ret; > + return kvmalloc_node(array_size(sizeof(struct page), > + PAGES_PER_SECTION), GFP_KERNEL, nid); > } > > static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages, > struct vmem_altmap *altmap) > { > - struct page *memmap = pfn_to_page(pfn); > - > - if (is_vmalloc_addr(memmap)) > - vfree(memmap); > - else > - free_pages((unsigned long)memmap, > - get_order(sizeof(struct page) * PAGES_PER_SECTION)); > + kvfree(pfn_to_page(pfn)); > } > > static void free_map_bootmem(struct page *memmap) > -- > 2.17.2 > -- Michal Hocko SUSE Labs