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Mon, 10 May 2021 05:20:24 -0700 (PDT) MIME-Version: 1.0 References: <20210510030027.56044-1-songmuchun@bytedance.com> <20210510030027.56044-7-songmuchun@bytedance.com> <20210510104524.GD22664@linux> In-Reply-To: <20210510104524.GD22664@linux> From: Muchun Song Date: Mon, 10 May 2021 20:19:47 +0800 Message-ID: Subject: Re: [External] Re: [PATCH v23 6/9] mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page To: Oscar Salvador Cc: Jonathan Corbet , Mike Kravetz , Thomas Gleixner , Ingo Molnar , bp@alien8.de, X86 ML , hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, Peter Zijlstra , Alexander Viro , Andrew Morton , paulmck@kernel.org, pawan.kumar.gupta@linux.intel.com, Randy Dunlap , oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, Mina Almasry , David Rientjes , Matthew Wilcox , Michal Hocko , "Song Bao Hua (Barry Song)" , David Hildenbrand , =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= , Joao Martins , Xiongchun duan , fam.zheng@bytedance.com, zhengqi.arch@bytedance.com, linux-doc@vger.kernel.org, LKML , Linux Memory Management List , linux-fsdevel Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 29A37407F8FA X-Stat-Signature: 6w8x5m8c53re3t994a16kdpyt5w5f7qc Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=bytedance-com.20150623.gappssmtp.com header.s=20150623 header.b=a8rST2mi; spf=pass (imf10.hostedemail.com: domain of songmuchun@bytedance.com designates 209.85.214.172 as permitted sender) smtp.mailfrom=songmuchun@bytedance.com; dmarc=pass (policy=none) header.from=bytedance.com Received-SPF: none (bytedance.com>: No applicable sender policy available) receiver=imf10; identity=mailfrom; envelope-from=""; helo=mail-pl1-f172.google.com; client-ip=209.85.214.172 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1620649210-338995 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 Mon, May 10, 2021 at 6:45 PM Oscar Salvador wrote: > > On Mon, May 10, 2021 at 11:00:24AM +0800, Muchun Song wrote: > > --- a/mm/hugetlb.c > > +++ b/mm/hugetlb.c > > @@ -1376,6 +1376,39 @@ static void remove_hugetlb_page(struct hstate *h, struct page *page, > > h->nr_huge_pages_node[nid]--; > > } > > > > +static void add_hugetlb_page(struct hstate *h, struct page *page, > > + bool adjust_surplus) > > +{ > > + int zeroed; > > + int nid = page_to_nid(page); > > + > > + VM_BUG_ON_PAGE(!HPageVmemmapOptimized(page), page); > > + > > + lockdep_assert_held(&hugetlb_lock); > > + > > + INIT_LIST_HEAD(&page->lru); > > + h->nr_huge_pages++; > > + h->nr_huge_pages_node[nid]++; > > + > > + if (adjust_surplus) { > > + h->surplus_huge_pages++; > > + h->surplus_huge_pages_node[nid]++; > > + } > > + > > + set_compound_page_dtor(page, HUGETLB_PAGE_DTOR); > > + set_page_private(page, 0); > > I think this has already been discused, so sorry about this. > > The only reason to need the set_page_private() is because of the dissolving > function right? add_hugetlb_page() can only get reached via free_huge_page(), > or dissolve_free_huge_page, and while the former clears the flags, the latter > it does not. Not exactly right. free_huge_page() does not clear HPageTemporary if the page is temporarily allocated when freeing. You are right that dissolve_free_huge_page() does not clear HPageFreed. > > I think this function would benefit from some renaming. add_hugetlb_page() gives > me no hint of what is this about, although I can figure it out reading the code. Because I think it is the reverse operation of remove_hugetlb_page, I named it add_hugetlb_page. Do you have any suggestions for renaming? Thanks. > > With that: Reviewed-by: Oscar Salvador > > > > > -- > Oscar Salvador > SUSE L3