From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yx1-f48.google.com (mail-yx1-f48.google.com [74.125.224.48]) (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 A868A42DA5A for ; Mon, 24 Aug 2026 14:37:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.224.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787582225; cv=none; b=Bqk7mt4h0Vx/xwLcMkYnnPQ7dv+bXKiJvNNFTAtG9HeOXgCyfXqyqfyJ/SmrW6pIiHLEJCnSLy1pshhTzJZU0RvtM50/ui1ZFn2MOwHp3Ara5quQv/7QBsXJBCeo5VQEU1ajSAELaeRHmww15NziPoKJsIGsUsmsC/kZ2mIBOog= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787582225; c=relaxed/simple; bh=1YRYVGkuKNtQk+ObMqK/890RkRJk46OHbYzz71c/FoY=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=skTAz/xT5vNaajjXPeYvS7sT/2g4ZD00+yGCXuxaEPa2oBwtlMfg3UrGnCOWXHIX9XcCVh0oFvI8VFY+5nA4xEVRXXx/N6ZbLuXq2r42b/UMxKGJ0pz7xQsnDjoDr6TiuxMQ77EYyGul/2KGxZimJJAMSgnJGNRgsXRDaZcj2JA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CpoTD5X2; arc=none smtp.client-ip=74.125.224.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CpoTD5X2" Received: by mail-yx1-f48.google.com with SMTP id 956f58d0204a3-66d116f0de8so382878d50.0 for ; Mon, 24 Aug 2026 07:37:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1787582222; x=1788187022; darn=vger.kernel.org; h=content-type:mime-version:references:message-id:in-reply-to:subject :cc:to:from:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=dFFCpD+eyjMYiOlaAWIMnRn59i/x4sm2LgO1kNi90A0=; b=CpoTD5X2Yap6uyOE19vYISXLZLUPaFug+oYxYnFCxjdDvc/IoO+SW/2rh9+xSgQaCo MxsDfnJdHR4y4UsTLKJ9tB5Eu3l/k9lwrum05vtjfTL6VFXGra1GIDZWaDJSjrAM6nwj aOIzSjO/H69XukuT82R+NGw3hyFDx3YegL7S5PRdlzPOdtEoyB/qTVRrtdGa1MwzAcxh H1PNXBt9gLhpHKRMVy8RP/HaVXlhrOHTI2ZXz6NUWxzGW5RulmZ2LrtgJTuYaj4fWNl6 4RUJpUUkoPUMOzaHzrUOYgmftSCaIQ6reFW+xKhc8L7+qgiEv8+BI4UcNtYj9curBKdR T/gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787582222; x=1788187022; h=content-type:mime-version:references:message-id:in-reply-to:subject :cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=dFFCpD+eyjMYiOlaAWIMnRn59i/x4sm2LgO1kNi90A0=; b=lWPWD/D83KYFVHo384mSASvrG7K5sUgomWnDxCp3x8m5hYM5FLk1pnnFOF3ZHnQuLt bbWo42NBRmdENCIAmtaeRL6NUZAeQeS2fcRYof+VEtATFA1GCboNhULOj/D3a6XFB+x6 GzIV26Q+mfJigsjYLoUIyFOm366M6at1KNMaSF9o7k3NDSBcWBx2l+6aN7BPSjchU7Wr tBR9k89qd1TruGUxGZ9iB7nei4Xi4oDvp8/pju8OR8o0HvDTk5FJ2xGbH25AS6U9wh0s BDpwpo2GofcnLZ5mrRRNxD+LN7NfHPC/BK72ssotWJgo3GelfC6Rk33BXsXTCcDZ4oE0 vs9w== X-Forwarded-Encrypted: i=1; AHgh+Rrd/MkO40dJJHKhNnkQa118dTlNPQLD8tgyJKgVSlUt12wvufjzKxeHzQUo41C5xxealfsRwYwene1SP+XP@vger.kernel.org X-Gm-Message-State: AFuF++lzVmc8hTRQKxiX6fnX54VbLdE5sjwNL+jGuTeS3z8f4YsKyk9w wHfa7MFKYSd9eDXPwq2YBHbTo/pxYR65rC/++RC8rjDiwe2E1fLaJ+N5UOnfxUspMw== X-Gm-Gg: AR+sD12XmFzUvkyYLt/OHJEviBZ8213/t+b1ui5zRFVvV57lY2K4WlyL+rgyLwZvnYA DEXoTIh6R78u4HSAI+ne/P5CaHs4rFT/iXCvgJLxe+RusBhR4yWl+YeRk8qXXubnN0qAnsTASMr USOwzrCAZ+6jLcl2pa4Oq6AhuOE+561OtVa9KK4afTSVTb4dfEqeH4LDq1VCnKJZqsmef66R9E2 WfPsbg5AUPmk3p68TgK3HcNQ/3rDL78jRqXbtVeK3FCvpL1ouZAr31p007m1AxRNHZuaZuj5h3T cBhw2owFvBLeAwc8odWTXj3iQiCvqgOgqu/USI30Q03CLgQthSs/qtwYYL4BrdNUxMn6K5hxSu+ SpseCnJC1bmV5TPhelwBrLeKCDtrScg5Ibsj1W3gEF9MgBQ9QsMAQ8/c6+G4lWhyGb43ppwEM5d Bb7yyqEnw2x7VLS8rxglIlffcalhmNrJCQcnUJpkbkcb4RpNswrppn99KuZkmjzBB2ZkINKAzz4 dV0uutsO0/nnKalOFY3MBVcfyZGXrUsLb2n+//IUuQZsB/x X-Received: by 2002:a05:690e:1309:b0:66d:7b7:e36c with SMTP id 956f58d0204a3-66d07b7ea83mr2357073d50.48.1787582221803; Mon, 24 Aug 2026 07:37:01 -0700 (PDT) Received: from darker.attlocal.net (172-10-233-147.lightspeed.sntcca.sbcglobal.net. [172.10.233.147]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-66cf46460aesm3729534d50.6.2026.08.24.07.36.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Aug 2026 07:37:01 -0700 (PDT) Date: Mon, 24 Aug 2026 07:36:57 -0700 (PDT) From: Hugh Dickins To: Andrew Morton cc: Ackerley Tng , Alexander Viro , Baolin Wang , Barry Song , Binbin Wu , Christian Brauner , Christoph Hellwig , Christoph Lameter , Claudio Imbrenda , David Hildenbrand , JP Kobryn , Jan Kara , Jens Axboe , Johannes Weiner , Kairui Song , Kiryl Shutsemau , Lance Yang , Leonardo Bras , Lorenzo Stoakes , Marcelo Tosatti , Matthew Wilcox , Mel Gorman , Miaohe Lin , Michal Hocko , Minchan Kim , Muchun Song , Oscar Salvador , Peter Zijlstra , Qi Zheng , Rik van Riel , Sebastian Andrzej Siewior , Shakeel Butt , Suren Baghdasaryan , Vlastimil Babka , Yang Shi , Yu Zhao , Zach O'Keefe , Zi Yan , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 19/25] mm/fbatch: vm/stat_refresh include lru_add_drain() on each cpu In-Reply-To: <14a16945-529b-8bc0-ab38-3ea97e54e223@google.com> Message-ID: <509da837-bd5c-2090-d26d-0002fef0b1ac@google.com> References: <14a16945-529b-8bc0-ab38-3ea97e54e223@google.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Reading or writing /proc/sys/vm/stat_refresh has long been a way for testing to force an immediate refresh of /proc/vmstat numbers: it seems appropriate that it should also call lru_add_drain() on each cpu that it visits, before collecting that processor's diffs. Add that in refresh_vm_stats(). I wanted it in refresh_cpu_vm_stats(), which would include it in the regular (default HZ) vmstat_update() too: which might be a wise precaution when proposing to eliminate almost all the old calls to lru_add_drain_all(). However, that would go against its "strives to only access node local memory" cacheline care, and bring it into lruvec lock contention: which would probably displease its authors. Signed-off-by: Hugh Dickins --- mm/vmstat.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 3b5cb1031f72..0f75488687b5 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1973,6 +1973,7 @@ static int vmstat_late_init_done; #ifdef CONFIG_PROC_FS static void refresh_vm_stats(struct work_struct *work) { + lru_add_drain(); refresh_cpu_vm_stats(true); } -- 2.51.0