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Mon, 13 Jan 2020 16:48:36 -0800 (PST) Received: from [2620:15c:17:3:3a5:23a7:5e32:4598] ([2620:15c:17:3:3a5:23a7:5e32:4598]) by smtp.gmail.com with ESMTPSA id z11sm16093204pfk.96.2020.01.13.16.48.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jan 2020 16:48:36 -0800 (PST) Date: Mon, 13 Jan 2020 16:48:35 -0800 (PST) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: Mina Almasry cc: mike.kravetz@oracle.com, shuah@kernel.org, shakeelb@google.com, gthelen@google.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com, mkoutny@suse.com Subject: Re: [PATCH v9 6/8] hugetlb_cgroup: support noreserve mappings In-Reply-To: <20191217231615.164161-6-almasrymina@google.com> Message-ID: References: <20191217231615.164161-1-almasrymina@google.com> <20191217231615.164161-6-almasrymina@google.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII 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, 17 Dec 2019, Mina Almasry wrote: > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index 39eb2fa53a420..3e94f5c2d7cd4 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -1367,6 +1367,9 @@ void free_huge_page(struct page *page) > clear_page_huge_active(page); > hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), > page, false); > + hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), > + page, true); > + > if (restore_reserve) > h->resv_huge_pages++; > > @@ -2189,10 +2192,19 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, > gbl_chg = 1; > } > > + /* If this allocation is not consuming a reservation, charge it now. > + */ > + if (map_chg || avoid_reserve || !vma_resv_map(vma)) { These conditions are checked three times in this function, maybe better set a bool on the stack and use it throughout the function to guarantee it remains consistent? bool deferred_reserve = !vma_resv_map(vma) || map_chg || avoid_reserve; > + ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), > + &h_cg, true); > + if (ret) > + goto out_subpool_put; > + } > + > ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg, > false); > if (ret) > - goto out_subpool_put; > + goto out_uncharge_cgroup_reservation; > > spin_lock(&hugetlb_lock); > /* > @@ -2216,6 +2228,14 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, > } > hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page, > false); > + /* If allocation is not consuming a reservation, also store the > + * hugetlb_cgroup pointer on the page. > + */ > + if (!vma_resv_map(vma) || map_chg || avoid_reserve) { > + hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, > + page, true); > + } > + > spin_unlock(&hugetlb_lock); > > set_page_private(page, (unsigned long)spool); > @@ -2241,6 +2261,10 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, > out_uncharge_cgroup: > hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg, > false); > +out_uncharge_cgroup_reservation: > + if (map_chg || avoid_reserve || !vma_resv_map(vma)) > + hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), > + h_cg, true); > out_subpool_put: > if (map_chg || avoid_reserve) > hugepage_subpool_put_pages(spool, 1); > -- > 2.24.1.735.g03f4e72817-goog >