From nobody Sat Feb 7 11:39:05 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 717EE50A8F for ; Fri, 2 Feb 2024 08:09:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706861390; cv=none; b=iQ40t7IUBaIx3+P+8vkjIJTPtG11b2qwVI4YPN5ypyDnK8cWI0rIKda4ldysH/DJWf8Wn0zJ94dp5PCCsfTK75AOto1Q9BqIC43GhhYZ0YwAmMCEJ24xL0JFlsbUxcPdDdFER5ltz34SB0S79hAMXlipYsWIiWXPwCqtJjrglxI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706861390; c=relaxed/simple; bh=ExbEqfvzT1fzU5mx7AphI5+/hTRoouLXcKYYJ84Z8nk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kPZ3lxuJ9WR64mI48xcvP6EX+aXTt1+EQc8YWdsdVTDznQOhh2NTGkaRxcWWI98wpI/LM2qVQies9z5h2pOn0Nf9ez0pbqphy7AHISmbU4ubRXkdqDoOger/g+i6T0mnEXS4KSdAQrhuWDI+FfW64NgzUqVRBn/igzT367x1i3I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 599431BF7; Fri, 2 Feb 2024 00:10:30 -0800 (PST) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6D8E53F5A1; Fri, 2 Feb 2024 00:09:44 -0800 (PST) From: Ryan Roberts To: Catalin Marinas , Will Deacon , Ard Biesheuvel , Marc Zyngier , James Morse , Andrey Ryabinin , Andrew Morton , Matthew Wilcox , Mark Rutland , David Hildenbrand , Kefeng Wang , John Hubbard , Zi Yan , Barry Song <21cnbao@gmail.com>, Alistair Popple , Yang Shi , Nicholas Piggin , Christophe Leroy , "Aneesh Kumar K.V" , "Naveen N. Rao" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 24/25] arm64/mm: __always_inline to improve fork() perf Date: Fri, 2 Feb 2024 08:07:55 +0000 Message-Id: <20240202080756.1453939-25-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240202080756.1453939-1-ryan.roberts@arm.com> References: <20240202080756.1453939-1-ryan.roberts@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" As set_ptes() and wrprotect_ptes() become a bit more complex, the compiler may choose not to inline them. But this is critical for fork() performance. So mark the functions, along with contpte_try_unfold() which is called by them, as __always_inline. This is worth ~1% on the fork() microbenchmark with order-0 folios (the common case). Signed-off-by: Ryan Roberts Acked-by: Mark Rutland --- arch/arm64/include/asm/pgtable.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgta= ble.h index 353ea67b5d75..cdc310880a3b 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1213,8 +1213,8 @@ extern int contpte_ptep_set_access_flags(struct vm_ar= ea_struct *vma, unsigned long addr, pte_t *ptep, pte_t entry, int dirty); =20 -static inline void contpte_try_unfold(struct mm_struct *mm, unsigned long = addr, - pte_t *ptep, pte_t pte) +static __always_inline void contpte_try_unfold(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, pte_t pte) { if (unlikely(pte_valid_cont(pte))) __contpte_try_unfold(mm, addr, ptep, pte); @@ -1279,7 +1279,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte) } =20 #define set_ptes set_ptes -static inline void set_ptes(struct mm_struct *mm, unsigned long addr, +static __always_inline void set_ptes(struct mm_struct *mm, unsigned long a= ddr, pte_t *ptep, pte_t pte, unsigned int nr) { pte =3D pte_mknoncont(pte); @@ -1361,8 +1361,8 @@ static inline int ptep_clear_flush_young(struct vm_ar= ea_struct *vma, } =20 #define wrprotect_ptes wrprotect_ptes -static inline void wrprotect_ptes(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, unsigned int nr) +static __always_inline void wrprotect_ptes(struct mm_struct *mm, + unsigned long addr, pte_t *ptep, unsigned int nr) { if (likely(nr =3D=3D 1)) { /* --=20 2.25.1