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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3049EC3ABDD for ; Tue, 20 May 2025 14:43:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BD1876B0099; Tue, 20 May 2025 10:43:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B81C16B009A; Tue, 20 May 2025 10:43:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A97CD6B009D; Tue, 20 May 2025 10:43:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 8B96E6B0099 for ; Tue, 20 May 2025 10:43:15 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 3C5F11A0555 for ; Tue, 20 May 2025 14:43:15 +0000 (UTC) X-FDA: 83463553950.17.B5F5454 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id AEEDA4000B for ; Tue, 20 May 2025 14:43:12 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=qkhPg54B; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1747752193; a=rsa-sha256; cv=none; b=f3cfS0y+kUYQY6qZ8StFlVTYNh6HEQekSNSWF/Bd2OfzcFDRn3LON5VZ58TNDNURNP+5xS IuXZt0J23gIxKP1QsrpYXaFVcTajErsY2f4bdxb60hUkpERp/zIN3vLcGfrIiXQMcoYyNI i1ETVR2PNna/Fiax4bmrbAUUuB+nyUM= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=qkhPg54B; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1747752193; h=from:from:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=EAPATIh1fAZtjZuQSTR1ra9E8nQTaxiqjCg+FNJ+QM0=; b=z35xk7UN/NAeEsJroDy/kqtsggvn5pRly+9YOT9paCoFemg/+aYmmsh+MmLYUWJL3Lgcoi 86nq0DC7nv8+eb+9UKp0+V4IRU4x0g8nD8tlVzRoOnMFFuVfN8+B6ZBPkSUyRoflUpLs+F F/yktn3ySFbg0TRNzLbDUjEfXF1iYog= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=EAPATIh1fAZtjZuQSTR1ra9E8nQTaxiqjCg+FNJ+QM0=; b=qkhPg54BkM9rkl50v1YZujRl/M rwazdKek/mePfCntGVEBxZUo2FtSbyt7RpSpQ4YMj2O2R6eh732jIlxHFYECEUT2Ha8sVIwN3A26E CVan7is2mJh2fBJ0Ih4PBA0RoupNG6UUGnABnHeIfQHotHEgxp0WXBMesxstgmZR/0kC/zKow9dDw gOLmGVgvtfBdd1VXnMxMGbUamLk90Kf/BQPUhzkHNjJmot8m1d8PWahfYi9pc9Jbq8qqrvwoFlpP/ OIhiBXL5T9xj9/8qycETzXh9O2E+z9KmHlzkS+LkXHxBV/KUwiNzRkkOiOTEYRfbGpNC9KSFjMuge WSmhAabQ==; Received: from willy by casper.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1uHOBC-00000003OFy-0Yyy; Tue, 20 May 2025 14:42:54 +0000 Date: Tue, 20 May 2025 15:42:53 +0100 From: Matthew Wilcox To: Lorenzo Stoakes Cc: Usama Arif , Yafang Shao , Nico Pache , akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, gutierrez.asier@huawei-partners.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, bpf@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH v2 0/5] mm, bpf: BPF based THP adjustment Message-ID: References: <20250520060504.20251-1-laoar.shao@gmail.com> <2345b8b9-b084-4661-8b55-61fd7fc7de57@lucifer.local> <82f7bca5-384f-41e5-a0fc-0e1e8e260607@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: AEEDA4000B X-Stat-Signature: tp9ngddiwgpp8j3oohew8ttxbc85xprm X-HE-Tag: 1747752192-457569 X-HE-Meta: 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 Tk147JS/ wuKt4 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, May 20, 2025 at 03:35:49PM +0100, Lorenzo Stoakes wrote: > I agree global settings are not fine-grained enough, but 'sys admins refuse > to do X so we want to ignore what they do' is... really not right at all. Oh, we do that all the time, Leave the interface around but document it's now a no-op. For example, file-backed memory ignores the THP settings completely. And mounting an NFS filesystem as "intr" has been a no-op for over a decade.