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 4B0DBC53210 for ; Tue, 3 Jan 2023 04:57:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 4E8738E0002; Mon, 2 Jan 2023 23:57:39 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 498D88E0001; Mon, 2 Jan 2023 23:57:39 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 387628E0002; Mon, 2 Jan 2023 23:57:39 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 29C928E0001 for ; Mon, 2 Jan 2023 23:57:39 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id C5F55409D3 for ; Tue, 3 Jan 2023 04:57:38 +0000 (UTC) X-FDA: 80312279796.15.E5826F5 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) by imf01.hostedemail.com (Postfix) with ESMTP id 258D640002 for ; Tue, 3 Jan 2023 04:57:34 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=t-8ch.de header.s=mail header.b=mTHw1I0H; spf=pass (imf01.hostedemail.com: domain of thomas@t-8ch.de designates 159.69.126.157 as permitted sender) smtp.mailfrom=thomas@t-8ch.de; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1672721856; 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=PNoZ3EJ5LKqtoeWQcf7z1vTtBM0D+GKzJfZxAi4Lvfs=; b=XKssyuVCjcxAdh6gy90pcY8qju6IzCQfQj/IBd7G0r5liTetqrsAAaDYIvOHmWGXjvbco6 rVP+HNln+AuwdSHu3IfLniJQV5Ri0oyDhY/RYVcdrB+3aIRFi1avHb9sOo71axu5rnWJB8 YbLwVvl6/JDMZ6E4gPx4yDJ4/H6kU6A= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=t-8ch.de header.s=mail header.b=mTHw1I0H; spf=pass (imf01.hostedemail.com: domain of thomas@t-8ch.de designates 159.69.126.157 as permitted sender) smtp.mailfrom=thomas@t-8ch.de; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1672721856; a=rsa-sha256; cv=none; b=a/kPYTRTjE5RQZCblLqwPU9yKYuup0ASeU9Va0WP4z+M5LI+XbBy6dOyOwXc8WbeFaUr4B TREBBHdz8omkGeER8u3Ht5hTdjTHGJ4kxLZswr9fkm0x1FwlQ68yZIDmHrQtnQuTzutaqU /WAHxtTj1O4xgBNE+8FDUq32PyXIkQE= Date: Tue, 3 Jan 2023 04:57:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=t-8ch.de; s=mail; t=1672721852; bh=qHT9ynUNePmbez+/aAzqzwd6n3m2y1VpkqHC8LN1MnI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=mTHw1I0H/f6r6okGl49TwcTJbdbBuJ8h9xcEb351bCM6nGPMvlq/xWTpkwiSWmPAB QFt56p5DbSSB/P7bONUIHTuhTR0yJXC9Ddh5OQf8w+kHFjCppv3HXY/2EyY8LJ0UPQ A+gLjUxdo+XaOstIWGaO4lW7OkmCx/ZuEqST27Y8= From: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= To: Nhat Pham Cc: akpm@linux-foundation.org, hannes@cmpxchg.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, minchan@kernel.org, ngupta@vflare.org, senozhatsky@chromium.org, sjenning@redhat.com, ddstreet@ieee.org, vitaly.wool@konsulko.com, linux@weissschuh.net Subject: Re: [PATCH v7 0/6] Implement writeback for zsmalloc Message-ID: <20230103045730.2ctv3n2ckzzmdzdx@snowball.t-8ch.de> References: <20221128191616.1261026-1-nphamcs@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221128191616.1261026-1-nphamcs@gmail.com> X-Stat-Signature: 8fshjb8j4h4qpurdbx4hfsetik4r8yk8 X-Rspam-User: X-Rspamd-Queue-Id: 258D640002 X-Rspamd-Server: rspam06 X-HE-Tag: 1672721854-954744 X-HE-Meta: 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 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: Hi, On Mon, Nov 28, 2022 at 11:16:09AM -0800, Nhat Pham wrote: > Unlike other zswap's allocators such as zbud or z3fold, zsmalloc > currently lacks the writeback mechanism. This means that when the zswap > pool is full, it will simply reject further allocations, and the pages > will be written directly to swap. > > This series of patches implements writeback for zsmalloc. When the zswap > pool becomes full, zsmalloc will attempt to evict all the compressed > objects in the least-recently used zspages. Then this part of Documentation/admin-guide/mm/zswap.rst should probably also be updated at some point: However, zsmalloc does not implement compressed page eviction, so once zswap fills it cannot evict the oldest page, it can only reject new pages. Thomas