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 B5F60C67871 for ; Mon, 24 Oct 2022 22:31:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231351AbiJXWbF (ORCPT ); Mon, 24 Oct 2022 18:31:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231612AbiJXWad (ORCPT ); Mon, 24 Oct 2022 18:30:33 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57D602B9B8F for ; Mon, 24 Oct 2022 13:53:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666644721; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=JQGL1jLTE4eRZpodNbuy8I66zGQdLeMOjp5jA6UyMm8=; b=SMLj+kTJpCfkbLX4kUjhidTC9ZIompgDBf30IkHuYN+JPBeazurVDNHm8WZuivCqOjlsgg xDY/PTU5udWOR2DQsgzwrGoQyv18ZfnDPjb7IaZZmuiwwjBx4gDaEZ5SaAA1r5mNziU9Jr H2kNyzRx0CyyCXsa0SBRzIs0KRe2Qqg= Received: from mail-qk1-f200.google.com (mail-qk1-f200.google.com [209.85.222.200]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-528-wjrmJy9PN0CopY0F2Db78g-1; Mon, 24 Oct 2022 16:48:34 -0400 X-MC-Unique: wjrmJy9PN0CopY0F2Db78g-1 Received: by mail-qk1-f200.google.com with SMTP id i11-20020a05620a404b00b006eeb0791c1aso9958692qko.10 for ; Mon, 24 Oct 2022 13:48:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=JQGL1jLTE4eRZpodNbuy8I66zGQdLeMOjp5jA6UyMm8=; b=lFos9yJD0ewLmnwNQraGNnKBDFjvnwvqTX3mcycZgBQoTJ/eL6dL40HsrsfZifQqrw qt9vvRiWs/ty7x2FNOXOTLjlZh1nWRf2C/EHl2qW/YGYMfVsDRuC01vXSbnCFh2Ddlcr XNUXwx4DCqfwFjQarID2+Z7N/s1Rr3swpxdZkvNLeTs9TlNINEEgnYZ6G5sG31nUUkA6 TJPrifyNUNtYwY206lIf4UEDRWvWHOeGtrI6BjtmuMW6NTZsq2vh2+DLxAkT+NVfVoTu f2t7Jt3nfRKRFbRmZ2yAiAT03zpFRIlSKoHmDtfK5P0Nvo5fvXcU+fws3T4O61cJ1BPX N8Jw== X-Gm-Message-State: ACrzQf0h45Bjiq7lbdQi3YRJY49/Y9lSWq80HgZ9mvT+xDCGSKKZoMq/ HYh5IVqEXeeLWW1qzUfvTDTKN60ZGlfS5ZJSJoxE06e6Fglwjygu9cGeJHLeyJWeQ3cEKrcmZUu hrWpe1cab/nDmv/ahao3TUxPXC4O2Iykqd2Fm2XV/noteEqiU/gX9at2m5Fhekyr7LgvL06JBmA == X-Received: by 2002:ac8:5809:0:b0:39d:db1:895 with SMTP id g9-20020ac85809000000b0039d0db10895mr19877751qtg.440.1666644513240; Mon, 24 Oct 2022 13:48:33 -0700 (PDT) X-Google-Smtp-Source: AMsMyM5kiaYHseH4qUmhdGwaMcoIvbNsE6lTLOG+iD7P8kRX5rpK3l1TOhSQyMDRCMFRdnSqlNtFFQ== X-Received: by 2002:ac8:5809:0:b0:39d:db1:895 with SMTP id g9-20020ac85809000000b0039d0db10895mr19877721qtg.440.1666644512931; Mon, 24 Oct 2022 13:48:32 -0700 (PDT) Received: from x1n.redhat.com (bras-base-aurron9127w-grc-46-70-31-27-79.dsl.bell.ca. [70.31.27.79]) by smtp.gmail.com with ESMTPSA id d13-20020ac8544d000000b0038d9555b580sm498531qtq.44.2022.10.24.13.48.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Oct 2022 13:48:32 -0700 (PDT) From: Peter Xu To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Huang Ying , peterx@redhat.com, Andrew Morton , HORIGUCHI NAOYA , Miaohe Lin , David Hildenbrand , Andrea Arcangeli Subject: [PATCH RFC 0/2] mm: Use pte marker for swapin errors Date: Mon, 24 Oct 2022 16:48:28 -0400 Message-Id: <20221024204830.1342169-1-peterx@redhat.com> X-Mailer: git-send-email 2.37.3 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This series uses the pte marker to replace the swapin error swap entry, then we safe one more swap entry. A new pte marker bit is defined. One thing worth mentioning: we need the pte marker to be always built to make sure it works like before, so I made an attempt in patch 1 to drop CONFIG_PTE_MARKER and always compile pte marker in. Since pte markers are enabled in many distributions by default already, meanwhile the codeset is really small I assume it's fine. But still I'm tagging with RFC for this initial version. Smoke tested on anonymous mem on a fake swap failure. Please have a look, thanks. Peter Xu (2): mm: Always compile in pte markers mm: Use pte markers for swap errors include/linux/swap.h | 16 ++++---------- include/linux/swapops.h | 49 +++++++++-------------------------------- mm/Kconfig | 7 ------ mm/memory.c | 13 ++++++----- mm/shmem.c | 2 +- mm/swapfile.c | 2 +- 6 files changed, 23 insertions(+), 66 deletions(-) -- 2.37.3