From mboxrd@z Thu Jan 1 00:00:00 1970 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 59778C433EF for ; Fri, 24 Jun 2022 17:37:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231979AbiFXRhk (ORCPT ); Fri, 24 Jun 2022 13:37:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231576AbiFXRhW (ORCPT ); Fri, 24 Jun 2022 13:37:22 -0400 Received: from mail-ua1-x94a.google.com (mail-ua1-x94a.google.com [IPv6:2607:f8b0:4864:20::94a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 444E1609EF for ; Fri, 24 Jun 2022 10:37:22 -0700 (PDT) Received: by mail-ua1-x94a.google.com with SMTP id v14-20020ab0768e000000b0037efa637aeeso1006779uaq.23 for ; Fri, 24 Jun 2022 10:37:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=WX+TLc+c32jY73zAmELqfC7scmTotnHMJPgbPcH9Hag=; b=rmtQIA0RTPQYWEYJ8kZRSAxO4ZWdbskuHARii0tUqF87tsg4HJnPzpTHsKmHhi7YHN szZo8r74Pfgxru6pGunO7KfxJtr6Wzabwa1wcCmLVAdMbm+j8fKHC5fV7wwrJG+ncVrB fWoXECRaKY9gz8ZiGg0zDe612OVnVf2pAh18JbfgZ2OytbBwiZCNN/oOGXrLiF3q3rzH fxFhSCJMn3o5octv4QkArXh3RvJqGO05jZSaGjrL9vscpWTsOFD0x47zLoXDuqUkCgEo PIWSrdAA+02ET/Ct0BrCGPnvyDWs7lIPDo0hPsnRg76cZrOaj70ey7iZ/86fIxktGj4r ckXQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=WX+TLc+c32jY73zAmELqfC7scmTotnHMJPgbPcH9Hag=; b=fg2uxSb0eIeOx+SwHEUnTeeQ0/mQ7qejyhIJQZ4lkZ1n4jf9eQkvW5M2RrasivKKI6 NYJxFBoJDDEGsZFH9oViVnlhFUAvObZzF9S2LL6HFFGe7HJuEieQfDJ8E1cs0KfEPanG zUJTalnxI10kLm3IthIy2KYcXVo3+KfKvqEBBYvebOY97W1vTvDI1mLFc4QqEhapoWlw 5DH8a/gMDi9elceWE8dWkAhmCM+qDzMyBVuCk49MRbfkMkU1U1uX8DfX9my2lcfadQZ/ h6f6drcPCHRoQH4dglZZOMNoRJBpbsPJwPmeXfInD0Js+wQ/zyL8iI5t5j+NmYCEbtZd 5DUw== X-Gm-Message-State: AJIora8VMsmlJ6zZyoRqImoEEJbryC3gfh4oDt4b/E52fcTjp70ImxeV QyT7G7Y940Z43AR6JJI+lHIzJNscK5LGWSzH X-Google-Smtp-Source: AGRyM1vX/wsU1Y9GWc4aZF68+l300w5Pdum+7CFc6GFKGc4oec+e4PYz/yVOvKtQiR6acb6V/yx2DV4xq/fD/H/b X-Received: from jthoughton.c.googlers.com ([fda3:e722:ac3:cc00:14:4d90:c0a8:2a4f]) (user=jthoughton job=sendgmr) by 2002:a67:6e47:0:b0:354:52a0:8ac2 with SMTP id j68-20020a676e47000000b0035452a08ac2mr173638vsc.65.1656092242031; Fri, 24 Jun 2022 10:37:22 -0700 (PDT) Date: Fri, 24 Jun 2022 17:36:39 +0000 In-Reply-To: <20220624173656.2033256-1-jthoughton@google.com> Message-Id: <20220624173656.2033256-10-jthoughton@google.com> Mime-Version: 1.0 References: <20220624173656.2033256-1-jthoughton@google.com> X-Mailer: git-send-email 2.37.0.rc0.161.g10f37bed90-goog Subject: [RFC PATCH 09/26] hugetlb: add hugetlb_hgm_enabled From: James Houghton To: Mike Kravetz , Muchun Song , Peter Xu Cc: David Hildenbrand , David Rientjes , Axel Rasmussen , Mina Almasry , Jue Wang , Manish Mishra , "Dr . David Alan Gilbert" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, James Houghton Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, this is always true if the VMA is shared. In the future, it's possible that private mappings will get some or all HGM functionality. Signed-off-by: James Houghton --- include/linux/hugetlb.h | 10 ++++++++++ mm/hugetlb.c | 8 ++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 33ba48fac551..e7a6b944d0cc 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -1174,6 +1174,16 @@ static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, } #endif /* CONFIG_HUGETLB_PAGE */ +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING +/* If HugeTLB high-granularity mappings are enabled for this VMA. */ +bool hugetlb_hgm_enabled(struct vm_area_struct *vma); +#else +static inline bool hugetlb_hgm_enabled(struct vm_area_struct *vma) +{ + return false; +} +#endif + static inline spinlock_t *huge_pte_lock(struct hstate *h, struct mm_struct *mm, pte_t *pte) { diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a2d2ffa76173..8b10b941458d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6983,6 +6983,14 @@ pte_t *huge_pte_offset(struct mm_struct *mm, #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */ +#ifdef CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING +bool hugetlb_hgm_enabled(struct vm_area_struct *vma) +{ + /* All shared VMAs have HGM enabled. */ + return vma->vm_flags & VM_SHARED; +} +#endif /* CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING */ + /* * These functions are overwritable if your architecture needs its own * behavior. -- 2.37.0.rc0.161.g10f37bed90-goog