From nobody Fri Apr 3 02:23:08 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7F0DECAAD8 for ; Sat, 17 Sep 2022 01:15:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229568AbiIQBPo (ORCPT ); Fri, 16 Sep 2022 21:15:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229564AbiIQBPk (ORCPT ); Fri, 16 Sep 2022 21:15:40 -0400 Received: from out30-43.freemail.mail.aliyun.com (out30-43.freemail.mail.aliyun.com [115.124.30.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DE8521901A for ; Fri, 16 Sep 2022 18:15:34 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=xhao@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0VPz2Krd_1663377330; Received: from localhost.localdomain(mailfrom:xhao@linux.alibaba.com fp:SMTPD_---0VPz2Krd_1663377330) by smtp.aliyun-inc.com; Sat, 17 Sep 2022 09:15:32 +0800 From: Xin Hao To: mike.kravetz@oracle.com Cc: songmuchun@bytedance.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, xhao@linux.alibaba.com Subject: [PATCH V3] mm/hugetlb: add available_huge_pages() func Date: Sat, 17 Sep 2022 09:15:28 +0800 Message-Id: <20220917011528.11331-1-xhao@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In hugetlb.c file, there are several places to compare the values of 'h->free_huge_pages' and 'h->resv_huge_pages', it looks a bit messy, so there add a new available_huge_pages() func to do these. Signed-off-by: Xin Hao Changes from v2 https://lore.kernel.org/linux-mm/20220916064127.1904-1-xhao@linux.alibaba.c= om/ - Convert is_resv_equal_free() to available_huge_pages() Reviewed-by: Mike Kravetz Reviewed-by: Oscar Salvador --- mm/hugetlb.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 5ea0b1b0d1ab..21d7f2361696 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1191,6 +1191,11 @@ static struct page *dequeue_huge_page_nodemask(struc= t hstate *h, gfp_t gfp_mask, return NULL; } +static unsigned long available_huge_pages(struct hstate *h) +{ + return h->free_huge_pages - h->resv_huge_pages; +} + static struct page *dequeue_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, unsigned long address, int avoid_reserve, @@ -1207,12 +1212,11 @@ static struct page *dequeue_huge_page_vma(struct hs= tate *h, * have no page reserves. This check ensures that reservations are * not "stolen". The child may still get SIGKILLed */ - if (!vma_has_reserves(vma, chg) && - h->free_huge_pages - h->resv_huge_pages =3D=3D 0) + if (!vma_has_reserves(vma, chg) && !available_huge_pages(h)) goto err; /* If reserves cannot be used, ensure enough pages are in the pool */ - if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages =3D=3D 0) + if (avoid_reserve && !available_huge_pages(h)) goto err; gfp_mask =3D htlb_alloc_mask(h); @@ -2105,7 +2109,7 @@ int dissolve_free_huge_page(struct page *page) if (!page_count(page)) { struct page *head =3D compound_head(page); struct hstate *h =3D page_hstate(head); - if (h->free_huge_pages - h->resv_huge_pages =3D=3D 0) + if (!available_huge_pages(h)) goto out; /* @@ -2315,7 +2319,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *= h, int preferred_nid, nodemask_t *nmask, gfp_t gfp_mask) { spin_lock_irq(&hugetlb_lock); - if (h->free_huge_pages - h->resv_huge_pages > 0) { + if (available_huge_pages(h)) { struct page *page; page =3D dequeue_huge_page_nodemask(h, gfp_mask, preferred_nid, nmask); -- 2.31.0