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=-6.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=no 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 F3B08C4363A for ; Mon, 26 Oct 2020 15:19:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 888C922404 for ; Mon, 26 Oct 2020 15:19:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DWQfni3d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 888C922404 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 15B166B0073; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 107C86B008A; Mon, 26 Oct 2020 11:19:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F3B406B008C; Mon, 26 Oct 2020 11:19:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0006.hostedemail.com [216.40.44.6]) by kanga.kvack.org (Postfix) with ESMTP id C7EA36B0073 for ; Mon, 26 Oct 2020 11:19:05 -0400 (EDT) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 6024D8249980 for ; Mon, 26 Oct 2020 15:19:05 +0000 (UTC) X-FDA: 77414434650.07.hands59_3809a5a27274 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin07.hostedemail.com (Postfix) with ESMTP id 40FB21803F9AA for ; Mon, 26 Oct 2020 15:19:05 +0000 (UTC) X-HE-Tag: hands59_3809a5a27274 X-Filterd-Recvd-Size: 2749 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf49.hostedemail.com (Postfix) with ESMTP for ; Mon, 26 Oct 2020 15:19:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:In-Reply-To:References; bh=tJdlcdGVmO5hb1GVldhbnE4FaImFjKkuAuz1KFFasXY=; b=DWQfni3dYUpdPMXkGjThM7VqH8 6kijMsd/J434O8lkAqUkW9kCPSPbHrN1t2J6mQuPrQo+69/7r63fSVEopoRZjxYjNoCPGVGD6AJfO Ox/o4C++Xv0glhBB/Ytl/w2piiG5HglNneRFupXuwvlhVXrikRPSjwp105nFcZ9T1vLh3r8mrH5jQ gjh439PddBlQm1htBsBE0zPyc820WMwlf6W7PZXnZk9TOoO2/HSUKazSvfSsNy7QZu6JE+sIjR59w HuGHnbL0JYFjoWziJtq74gxzTxqYFPMQ85HIhnw5xIFRm5yGKl4j4Z7DVhXnn+9X05Ir+8fobVEkJ crWmwBWQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kX4Gp-0006Jr-3D; Mon, 26 Oct 2020 15:18:51 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org Subject: [PATCH v2 0/4] Remove nrexceptional tracking Date: Mon, 26 Oct 2020 15:18:45 +0000 Message-Id: <20201026151849.24232-1-willy@infradead.org> X-Mailer: git-send-email 2.21.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000736, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: We actually use nrexceptional for very little these days. It's a minor pain to keep in sync with nrpages, but the pain becomes much bigger with the THP patches because we don't know how many indices a shadow entry occupies. It's easier to just remove it than keep it accurate. Also, we save 8 bytes per inode which is nothing to sneeze at; on my laptop, it would improve shmem_inode_cache from 22 to 23 objects per 16kB, and inode_cache from 26 to 27 objects. Combined, that saves a megabyte of memory from a combined usage of 25MB for both caches. Unfortunately, ext4 doesn't cross a magic boundary, so it doesn't save any memory for ext4. Matthew Wilcox (Oracle) (4): mm: Introduce and use mapping_empty mm: Stop accounting shadow entries dax: Account DAX entries as nrpages mm: Remove nrexceptional from inode fs/block_dev.c | 2 +- fs/dax.c | 8 ++++---- fs/gfs2/glock.c | 3 +-- fs/inode.c | 2 +- include/linux/fs.h | 2 -- include/linux/pagemap.h | 5 +++++ mm/filemap.c | 16 ---------------- mm/swap_state.c | 4 ---- mm/truncate.c | 19 +++---------------- mm/workingset.c | 1 - 10 files changed, 15 insertions(+), 47 deletions(-) --=20 2.28.0