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 X-Spam-Level: X-Spam-Status: No, score=-23.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 536B3C47094 for ; Mon, 7 Jun 2021 14:24:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38EC461107 for ; Mon, 7 Jun 2021 14:24:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230197AbhFGO0i (ORCPT ); Mon, 7 Jun 2021 10:26:38 -0400 Received: from mail-ot1-f47.google.com ([209.85.210.47]:43743 "EHLO mail-ot1-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230198AbhFGO0i (ORCPT ); Mon, 7 Jun 2021 10:26:38 -0400 Received: by mail-ot1-f47.google.com with SMTP id i12-20020a05683033ecb02903346fa0f74dso16836508otu.10 for ; Mon, 07 Jun 2021 07:24:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=4PwH1AXD3SllEEcEV6owIpVJRtalHEcUOPjpbDNsvcE=; b=cnyQchdM9XN7mTX7klVDRaZAGec8Q8qrrgJsK/rY5IWCFWqXKtJigc2u5iJ3nTKhXw hTCBoDi6PvaC7Qal4P5PtF+hNfxJn1UEkv9Hcf9wtTn4pAgUNqIJOUSXsbljLqmpewmm o915MnvFQ1z/s12k+1IjfeYKPee8nCycjHwGg9lCiAvsiBZiU16+Oc4LGR4H6FBXGjI2 JoUq37/RciUGNPVXDcKoI2f+/2f4Ew1q1gKOLYe6Pnu9XuAG41djRUSa78GNxa77lzgX YhOBNQ+SGZ/R7qUINBzULtCo2R7jCWVKASeTky5mGxFkxRVvoiaTjMJnE6UdLu371scO kfyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=4PwH1AXD3SllEEcEV6owIpVJRtalHEcUOPjpbDNsvcE=; b=mZxEzlqTpdS6lcM719LTW0ZdElIU9Cwf1+R4HhCP2FUv89jyp6V+zRQ3C7L1ZCB0ro LuyoH71uNudPbRN4lqIuRTXUDFNIykNX+OREibfsu3e8tMmdxhBFNvoOxte0CQdTZazn 2tg078K2ujSoHOwYHdAMponihc38Chud98kHcBeYId4ooqg2vCOE9KeS1R3WGM32U6fC SFy/7pw0auL2X22wSAh+8i/l2mngtqnzDDszJeefzd9N/2J+bE75dYKXjabkYvzYvqGn SDgOLj0ROoVUaiZK9/H+45I5AIjACllRN+ClYi/hJ9vnYcv09+MGZH0SFk7mxvp42AUy zxSg== X-Gm-Message-State: AOAM533FjsR9RB0czuYr8NKeKZvU4FbS9MV+Y/5GyFYVFZgv2i0Jp71e /Z8RhV2q0/YACgNOwZmi6CepWMM/OYap65OqeLapvMhT7k0Z/g== X-Google-Smtp-Source: ABdhPJz15LOt9hpVMXGWPSrsBD4CZ1VQ2e0HTqJhDcwL8qPa2YqaZL4KCBOgZGx/xE3Z2zHVczwClsGbRFeRlCUNwl0= X-Received: by 2002:a9d:7a54:: with SMTP id z20mr14261136otm.17.1623075826297; Mon, 07 Jun 2021 07:23:46 -0700 (PDT) MIME-Version: 1.0 References: <20210521083209.3740269-1-elver@google.com> In-Reply-To: <20210521083209.3740269-1-elver@google.com> From: Marco Elver Date: Mon, 7 Jun 2021 16:23:34 +0200 Message-ID: Subject: [5.12.y] kfence: use TASK_IDLE when awaiting allocation To: stable , Greg Kroah-Hartman , Sasha Levin Cc: Alexander Potapenko , kasan-dev Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Dear stable maintainers, The patch "kfence: use TASK_IDLE when awaiting allocation" has landed in mainline as 8fd0e995cc7b, however, does not apply cleanly to 5.12.y due to a prerequisite patch missing. My recommendation is to cherry-pick the following 2 commits to 5.12.y (rather than rebase 8fd0e995cc7b on top of 5.12.y): 37c9284f6932 kfence: maximize allocation wait timeout duration 8fd0e995cc7b kfence: use TASK_IDLE when awaiting allocation Many thanks, -- Marco ---------- Forwarded message --------- From: Marco Elver Date: Fri, 21 May 2021 at 10:32 Subject: [PATCH] kfence: use TASK_IDLE when awaiting allocation To: , Cc: , , , , , Mel Gorman , Since wait_event() uses TASK_UNINTERRUPTIBLE by default, waiting for an allocation counts towards load. However, for KFENCE, this does not make any sense, since there is no busy work we're awaiting. Instead, use TASK_IDLE via wait_event_idle() to not count towards load. BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1185565 Fixes: 407f1d8c1b5f ("kfence: await for allocation using wait_event") Signed-off-by: Marco Elver Cc: Mel Gorman Cc: # v5.12+ --- mm/kfence/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)