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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CA3E0C43219 for ; Thu, 10 Nov 2022 00:31:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232208AbiKJAbk (ORCPT ); Wed, 9 Nov 2022 19:31:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232204AbiKJAbY (ORCPT ); Wed, 9 Nov 2022 19:31:24 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC3E42A260 for ; Wed, 9 Nov 2022 16:31:13 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 695E361D25 for ; Thu, 10 Nov 2022 00:31:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE4F2C433C1; Thu, 10 Nov 2022 00:31:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1668040272; bh=ztCA3n7dzKNb66NyBBln+yhyT0KgZOf7ZJ1hcOPec3w=; h=Date:To:From:Subject:From; b=Uc5nVjPHoNagT7HywKJGU9KKlqcfmpf+Ud2OiaFYhlY9hjL0dJBpTFwIyrzHMkuBd 2g+ghTwOsn0mF1KCMp3X8aSna7HxpX/4PuEeD3TTBX11ta23gLdx7i2uiHN4Cn/UXz nHHysippPy5fM92Brugis8ENQ3XpvMjcaDCHUy1M= Date: Wed, 09 Nov 2022 16:31:12 -0800 To: mm-commits@vger.kernel.org, suleiman@google.com, nphamcs@gmail.com, ngupta@vflare.org, minchan@kernel.org, avromanov@sberdevices.ru, senozhatsky@chromium.org, akpm@linux-foundation.org From: Andrew Morton Subject: + zram-add-incompressible-writeback.patch added to mm-unstable branch Message-Id: <20221110003112.BE4F2C433C1@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: zram: add incompressible writeback has been added to the -mm mm-unstable branch. Its filename is zram-add-incompressible-writeback.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-add-incompressible-writeback.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Sergey Senozhatsky Subject: zram: add incompressible writeback Date: Wed, 9 Nov 2022 20:50:46 +0900 Add support for incompressible pages writeback: echo incompressible > /sys/block/zramX/writeback Link: https://lkml.kernel.org/r/20221109115047.2921851-13-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky Acked-by: Minchan Kim Cc: Alexey Romanov Cc: Nhat Pham Cc: Nitin Gupta Cc: Suleiman Souhlal Signed-off-by: Andrew Morton --- Documentation/admin-guide/blockdev/zram.rst | 7 ++++++- drivers/block/zram/zram_drv.c | 18 ++++++++++++------ 2 files changed, 18 insertions(+), 7 deletions(-) --- a/Documentation/admin-guide/blockdev/zram.rst~zram-add-incompressible-writeback +++ a/Documentation/admin-guide/blockdev/zram.rst @@ -348,8 +348,13 @@ this can be accomplished with:: echo huge_idle > /sys/block/zramX/writeback +If a user chooses to writeback only incompressible pages (pages that none of +algorithms can compress) this can be accomplished with:: + + echo incompressible > /sys/block/zramX/writeback + If an admin wants to write a specific page in zram device to the backing device, -they could write a page index into the interface. +they could write a page index into the interface:: echo "page_index=1251" > /sys/block/zramX/writeback --- a/drivers/block/zram/zram_drv.c~zram-add-incompressible-writeback +++ a/drivers/block/zram/zram_drv.c @@ -645,10 +645,10 @@ static int read_from_bdev_async(struct z #define PAGE_WB_SIG "page_index=" -#define PAGE_WRITEBACK 0 -#define HUGE_WRITEBACK (1<<0) -#define IDLE_WRITEBACK (1<<1) - +#define PAGE_WRITEBACK 0 +#define HUGE_WRITEBACK (1<<0) +#define IDLE_WRITEBACK (1<<1) +#define INCOMPRESSIBLE_WRITEBACK (1<<2) static ssize_t writeback_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) @@ -669,6 +669,8 @@ static ssize_t writeback_store(struct de mode = HUGE_WRITEBACK; else if (sysfs_streq(buf, "huge_idle")) mode = IDLE_WRITEBACK | HUGE_WRITEBACK; + else if (sysfs_streq(buf, "incompressible")) + mode = INCOMPRESSIBLE_WRITEBACK; else { if (strncmp(buf, PAGE_WB_SIG, sizeof(PAGE_WB_SIG) - 1)) return -EINVAL; @@ -731,11 +733,15 @@ static ssize_t writeback_store(struct de goto next; if (mode & IDLE_WRITEBACK && - !zram_test_flag(zram, index, ZRAM_IDLE)) + !zram_test_flag(zram, index, ZRAM_IDLE)) goto next; if (mode & HUGE_WRITEBACK && - !zram_test_flag(zram, index, ZRAM_HUGE)) + !zram_test_flag(zram, index, ZRAM_HUGE)) + goto next; + if (mode & INCOMPRESSIBLE_WRITEBACK && + !zram_test_flag(zram, index, ZRAM_INCOMPRESSIBLE)) goto next; + /* * Clearing ZRAM_UNDER_WB is duty of caller. * IOW, zram_free_page never clear it. _ Patches currently in -mm which might be from senozhatsky@chromium.org are zram-preparation-for-multi-zcomp-support.patch zram-add-recompression-algorithm-sysfs-knob.patch zram-factor-out-wb-and-non-wb-zram-read-functions.patch zram-introduce-recompress-sysfs-knob.patch zram-add-recompress-flag-to-read_block_state.patch zram-clarify-writeback_store-comment.patch zram-use-is_err_value-to-check-for-zs_malloc-errors.patch zram-remove-redundant-checks-from-zram_recompress.patch zram-add-algo-parameter-support-to-zram_recompress.patch documentation-add-zram-recompression-documentation.patch zram-add-incompressible-writeback.patch zram-add-incompressible-flag-to-read_block_state.patch