From nobody Mon Feb 9 08:19:32 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5509157A43; Wed, 10 Apr 2024 13:13:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712754797; cv=none; b=aipThA/Q5QAbbpxNFoqFSAGgEK7MDrjpC30HoQ8U1V0GQo52EibpGl7M1ijVAK6GPVKagd9kC1sKbv6hxJPjhUM1/VbU0cvG7+oQ1TtOrCflu0gR1lkg8WfBHAFbpzzwXAN+E6tAF0C118Autgzlwb6dZT6v9bzEbT6F044fPJk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712754797; c=relaxed/simple; bh=q+2ZsW/z1cIJaAuFufmwzxUPgQDmh1sFna8GkV828NI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ZWpaxt4y+jfjMkI0dml9L/9ZQct+7QMakr5V70aEBPrm/xZsjQ9weYiPJOb3IYpy7qO3Oy6We15kPVZCSmEYIIR4HRdj1N81nWpAgxG18xeZFAujPdYUgz2aDj827VBH2wVigltY1SPUvICf0/iBTjmMov7NVg0WHhJYMPjXFHU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DBD5C433F1; Wed, 10 Apr 2024 13:13:15 +0000 (UTC) From: Huacai Chen To: Huacai Chen Cc: loongarch@lists.linux.dev, Xuefeng Li , Guo Ren , Xuerui Wang , Jiaxun Yang , linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn, Huacai Chen Subject: [PATCH] LoongArch: Select THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE Date: Wed, 10 Apr 2024 21:12:56 +0800 Message-ID: <20240410131256.2165746-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.43.0 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" THP_SWAP has been proven to improve the swap throughput significantly on x86_64 system according to commit bd4c82c22c367e0 ("mm, THP, swap: delay splitting THP after swapped out"), on ARM64 system according to commit d0637c505f8a1d ("arm64: enable THP_SWAP for arm64") and on RISC-V system according to commit 87f81e66e2e84c7 ("riscv: enable THP_SWAP for RV64"). Enable THP_SWAP for LoongArch, testing the micro-benchmark which is introduced by commit d0637c505f8a1d ("arm64: enable THP_SWAP for arm64") shows below numbers on the Loongson-3A5000 board: swp out bandwidth w/o patch: 1815716 bytes/ms (mean of 10 tests) swp out bandwidth w/ patch: 3410003 bytes/ms (mean of 10 tests) Improved by 46.75%! Signed-off-by: Huacai Chen --- arch/loongarch/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index d52a95195e7f..41ddc39e1fc8 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -69,6 +69,7 @@ config LOONGARCH select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP select ARCH_WANTS_NO_INSTR + select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE select BUILDTIME_TABLE_SORT select COMMON_CLK select CPU_PM --=20 2.43.0