From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 58E1C36AB4B for ; Fri, 12 Jun 2026 18:09:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781287777; cv=none; b=M94Ee1Az3Djoxl6rZTB9SZpQU13px8iUbu9rNu1SS3u6xPRgBk/QoyiSE+lT1EPvgLrI32BdaQFMtuuw4FHqTUvDNM8n9trOKl6rya4ig4owB3Caiw0PKBpBJUlmvuJTvujpi9P64leB13hw7P6a6BoQX0mP9pHkIGytkUdNDoE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781287777; c=relaxed/simple; bh=k78/dGeiur15ZKYxGTYUWKhRtAFXQ+5zPwjr4BiDcPo=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=IPBhtx4UA1ZL++WEVVX2tkdA7Q18ed29CXZdGPCbVFb96mhnUeZLvXXTJDkipk0XgtQc9Irg7YMOwVheH0SZrMaaPBqBN06jHTEhice/crVIbClEqjMFgpeCYDUkOVgHd1aIvJ8vM3VSnlgVoafIHDrFCzW+8qi4W7Spgef+HSU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=DC1+r2nU; arc=none smtp.client-ip=209.85.214.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="DC1+r2nU" Received: by mail-pl1-f172.google.com with SMTP id d9443c01a7336-2c0b9328c4aso10755255ad.0 for ; Fri, 12 Jun 2026 11:09:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1781287776; x=1781892576; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=tIviRJIKLG37v3E4DnE8ZIX3XY+lQBK31eI/eTdPTgg=; b=DC1+r2nUPHp2Rdl/qntmjoWCbC9SjU9QQNh9QfUnHPxJCjLQ+eRTd5R0yeq7BZLNwU KV9QRXj2Ho3/kD5/DPXolRPOTGopWxaVKBpPwZGSpnOB4WWE2X/diQAye362Mz7v9D8+ 32F80TTDORAu474zMgRieKCAwm05IDe8mdvuvA4E1NlIFZbgTDrWQBsdVMN/DL40CsCy +ya9XDvyKyCzbEJCoB3OjTE5WTIGV9Q+LEzlN6aapmo8AUdbv2JEzDnlsDjsgmC3d+Yu R0PNhiGHxWYgV4lfhm7JjafI5YUXmifkMolBYgtoS26fiIs1WpU5WI7BLqm5pos+80gp QhcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781287776; x=1781892576; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=tIviRJIKLG37v3E4DnE8ZIX3XY+lQBK31eI/eTdPTgg=; b=CRNdROQqKNq96S7KTKA9zvTNKcI3Thni7U8z/YrinXL4hwdATDsN9jLyuWi6IShpAJ j0kAUvb2L23PQVF2S4A5zXAFmVo3U9B0aMZ4ChVv/YJvF7k0iS5e6AAampvRw10ULy0l GHnOz7HNAlTs0eXo3o9rFx879/OhlnTrkvTvSjPeRX7MI9lrBR5izBOZwJIVjSfAQt5z Lqa1W8yscx+nYwsrG/F7nok0xn4SU7wpkuYckTv2un70dWX0l2am3VCFHjPlAwS7OYuq lyCt9dbYhmOc0aG2Bxs2kdRtwR9dgTvj/6zTQ4PmQ52IEfH8Er5iJcD1zAwIcV7RWWmK jI7g== X-Forwarded-Encrypted: i=1; AFNElJ/vq/Dicqyc0ER1wqnuhXj4e5rv9tueTO70YS+crrneDJjJ81teaj6RwQHxPzCH381FuXdCeC7h6KTR/ZM=@vger.kernel.org X-Gm-Message-State: AOJu0YxEAmViOZThcedzAAA2CG4jmwtlR6d5Ntuk8vUMjZ7Xwjxr4UOZ ggZ4oaza1m6/gGXVKApMPlzKNMzWDXu9q4VcVr3a9HxiG05/+2bhBIop X-Gm-Gg: Acq92OEX4ay3ITDGySQQDFsgInUj2AEmf3u44BwTu4Uuv/OLWR4QVbc/GrmeyTxgi73 RUBqIjzXnbof0DjIL+UTiFFlY9zPSM7J4g9UgDSOSZ+aSC9NsnmD7Luy5e1p1nk4y4w1D2vGIzc 1f3r68NmtUuDvB8g3qdy7Z+gVKbyIpbJnVKLh0CF1+5paNTr7cghV1OfvPIUEvlVSrFIjFYxGB+ B2vEIEENytGSwzFOcgZnUA4k4WarhEHyiSAmJxwItwg6I4FE8RSZwis3Kj6hkHKr4VpZdxijgFy K8q6YFB8RKt5cCeUe5hM/Tk+uA985094ySMfSyyp910U0CbDVtbl+FJ+GZHpaT5pZ1N/SP4pzjj W1wwpGEYmY7V0ZPvurhLyYgchO+dDcAuDsy+bviEGfLdn9UEwfDhgRKWhwfp1N+TAOjfJEvfQKx 7ljLlRwZ2Fjystz+hEH4WJMyEIY8WBY5Qx X-Received: by 2002:a17:902:cecd:b0:2c2:27be:39a5 with SMTP id d9443c01a7336-2c412749c19mr43103815ad.33.1781287775593; Fri, 12 Jun 2026 11:09:35 -0700 (PDT) Received: from pve-server.rlab ([49.205.216.49]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c42f7c70easm38956975ad.25.2026.06.12.11.09.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jun 2026 11:09:34 -0700 (PDT) From: "Ritesh Harjani (IBM)" To: linux-mm@kvack.org Cc: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , David Hildenbrand , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Sayali Patil , "Ritesh Harjani (IBM)" Subject: [PATCH v3 0/3] mm, swap: Enable THP SWAP for PowerPC Book3S64 Date: Fri, 12 Jun 2026 23:39:14 +0530 Message-Id: X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On PowerPC Book3S64, MMU is selected at runtime, so macros like PMD_SHIFT are effectively runtime variables in the Book3S64 code. THP swap code uses these macros for e.g. to size some of its array data structures based on PMD_ORDER. This patch series makes that usage dependent on the runtime variable and provides an upper-bound architecture override for cases (e.g. SWAP_NR_ORDERS), where the runtime conversion is not considered beneficial. This series increases bandwidth throughput with zram backend for swapout by around 40-50% with Radix and 100-130% with Hash (Tested by Sayali) Note that this patch series is based out of linux-next (next-20260608). v2 -> v3: ========= 1. Fixed sparse warning for swap_table_use_page reported by lkp in patch-1 RFC -> v2: ========== 1. Send the unused leftovers change in swap.h separately [1] 2. Changed RFC Patch-3 design from runtime SWAP_NR_ORDERS to arch override (ARCH_MAX_PMD_ORDER) - suggested by Youngjun 3. Dropped RFC tag [1]: https://lore.kernel.org/linux-mm/68591daf0d679e5a0072d63751f187d14613e2b0.1781146877.git.ritesh.list@gmail.com/ [RFC]: https://lore.kernel.org/linux-mm/cover.1781000840.git.ritesh.list@gmail.com/ [v2]: https://lore.kernel.org/linuxppc-dev/cover.1781170904.git.ritesh.list@gmail.com/ Ritesh Harjani (IBM) (3): mm, swap: make SWAPFILE_CLUSTER runtime mm, swap: allow archs to override SWAP_NR_ORDERS via ARCH_MAX_PMD_ORDER powerpc: Kconfig: Enable THP_SWAP on Book3S64 arch/powerpc/include/asm/book3s/64/pgtable.h | 7 +++++ arch/powerpc/platforms/Kconfig.cputype | 1 + include/linux/swap.h | 12 ++++++++- mm/swap.h | 5 ++-- mm/swap_table.h | 6 ++--- mm/swapfile.c | 27 ++++++++++++++++---- 6 files changed, 46 insertions(+), 12 deletions(-) -- 2.39.5