From patchwork Sun Dec 22 20:07:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Maciej S. Szmigiero" X-Patchwork-Id: 11307677 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6155C14B7 for ; Sun, 22 Dec 2019 20:07:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 112852070A for ; Sun, 22 Dec 2019 20:07:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 112852070A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=maciej.szmigiero.name Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D0C818E0005; Sun, 22 Dec 2019 15:07:16 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id CBD698E0001; Sun, 22 Dec 2019 15:07:16 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B85968E0005; Sun, 22 Dec 2019 15:07:16 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0077.hostedemail.com [216.40.44.77]) by kanga.kvack.org (Postfix) with ESMTP id 9DB198E0001 for ; Sun, 22 Dec 2019 15:07:16 -0500 (EST) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id 594A05840 for ; Sun, 22 Dec 2019 20:07:16 +0000 (UTC) X-FDA: 76293861672.30.pin91_222fba3323b0a X-Spam-Summary: 2,0,0,5c347b32d493219e,d41d8cd98f00b204,mail@maciej.szmigiero.name,:sjenning@redhat.com:ddstreet@ieee.org:vitalywool@gmail.com:vbabka@suse.cz::linux-kernel@vger.kernel.org,RULES_HIT:4:41:355:379:800:854:960:966:967:973:982:988:989:1260:1277:1311:1313:1314:1345:1437:1515:1516:1518:1593:1594:1605:1683:1730:1747:1777:1792:2196:2198:2199:2200:2393:2525:2559:2563:2637:2682:2685:2693:2731:2859:2895:2902:2908:2910:2918:2924:2925:2926:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3865:3866:3867:3868:3870:3871:3872:3874:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4321:4385:4605:5007:6117:6119:6261:7903:8603:9025:10128:10489:11026:11232:11473:11658:11914:12043:12291:12295:12296:12297:12438:12517:12519:12555:12683:12760:12986:13153:13161:13200:13228:13229:13255:14394:21080:21433:21451:21627:21740:21810:21939:21966:21972:30003:30012:30026:30029:30046:30054:30062:30070,0,RBL:error,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCach e:0,MSF: X-HE-Tag: pin91_222fba3323b0a X-Filterd-Recvd-Size: 17828 Received: from vps-vb.mhejs.net (vps-vb.mhejs.net [37.28.154.113]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Sun, 22 Dec 2019 20:07:14 +0000 (UTC) Received: from MUA by vps-vb.mhejs.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.92.3) (envelope-from ) id 1ij7VP-0003E8-0U; Sun, 22 Dec 2019 21:07:11 +0100 From: "Maciej S. Szmigiero" Subject: [PATCH v6] zswap: allow setting default status, compressor and allocator in Kconfig To: Seth Jennings , Dan Streetman Cc: Vitaly Wool , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org Autocrypt: addr=mail@maciej.szmigiero.name; prefer-encrypt=mutual; keydata= mQINBFpGusUBEADXUMM2t7y9sHhI79+2QUnDdpauIBjZDukPZArwD+sDlx5P+jxaZ13XjUQc 6oJdk+jpvKiyzlbKqlDtw/Y2Ob24tg1g/zvkHn8AVUwX+ZWWewSZ0vcwp7u/LvA+w2nJbIL1 N0/QUUdmxfkWTHhNqgkNX5hEmYqhwUPozFR0zblfD/6+XFR7VM9yT0fZPLqYLNOmGfqAXlxY m8nWmi+lxkd/PYqQQwOq6GQwxjRFEvSc09m/YPYo9hxh7a6s8hAP88YOf2PD8oBB1r5E7KGb Fv10Qss4CU/3zaiyRTExWwOJnTQdzSbtnM3S8/ZO/sL0FY/b4VLtlZzERAraxHdnPn8GgxYk oPtAqoyf52RkCabL9dsXPWYQjkwG8WEUPScHDy8Uoo6imQujshG23A99iPuXcWc/5ld9mIo/ Ee7kN50MOXwS4vCJSv0cMkVhh77CmGUv5++E/rPcbXPLTPeRVy6SHgdDhIj7elmx2Lgo0cyh uyxyBKSuzPvb61nh5EKAGL7kPqflNw7LJkInzHqKHDNu57rVuCHEx4yxcKNB4pdE2SgyPxs9 9W7Cz0q2Hd7Yu8GOXvMfQfrBiEV4q4PzidUtV6sLqVq0RMK7LEi0RiZpthwxz0IUFwRw2KS/ 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VFnMoLX5UJAs0JyFqFY2YxGyLd4J103NI/ocqQeU0TVvOZGVkENPSxIESnbxPghsEC0MWEbG svqA8FwvU7XfGhZPYzTRf7CndDnezEA69EhwpZXKs4CvxbXo5PDTv0OWzVaAWqq8s8aTMJWW AhvobFozJ63zafYHkuEjMo0Xps3o3uvKg7coooH521nNsv4ci+KeBq3mgMCRAy0g/Ef+Ql7m t900RCBHu4tktOhPc3J1ep/e2WAJ4ngUqJhilzyCJnzVJ4cT79VK/uPtlfUCZdUz+jTC88Tm P1p5wlucS31kThy/CV4cqDFB8yzEujTSiRzd7neG3sH0vcxBd69uvSxLZPLGID840k0v5sft PA== Message-ID: <01197b3b-85ea-1a82-5bd4-8f18a622202c@maciej.szmigiero.name> Date: Sun, 22 Dec 2019 21:07:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 Content-Language: en-US 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: The compressed cache for swap pages (zswap) currently needs from 1 to 3 extra kernel command line parameters in order to make it work: it has to be enabled by adding a "zswap.enabled=1" command line parameter and if one wants a different compressor or pool allocator than the default lzo / zbud combination then these choices also need to be specified on the kernel command line in additional parameters. Using a different compressor and allocator for zswap is actually pretty common as guides often recommend using the lz4 / z3fold pair instead of the default one. In such case it is also necessary to remember to enable the appropriate compression algorithm and pool allocator in the kernel config manually. Let's avoid the need for adding these kernel command line parameters and automatically pull in the dependencies for the selected compressor algorithm and pool allocator by adding an appropriate default switches to Kconfig. The default values for these options match what the code was using previously as its defaults. Signed-off-by: Maciej S. Szmigiero Reviewed-by: Vitaly Wool --- Changes from v1: Rename CONFIG_ZSWAP_DEFAULT_COMP_* to CONFIG_ZSWAP_COMPRESSOR_DEFAULT_* and CONFIG_ZSWAP_DEFAULT_ZPOOL_* to CONFIG_ZSWAP_ZPOOL_DEFAULT_* while dropping the "_NAME" suffix from the final string option in both cases. Changes from v2: Add zsmalloc as a pool allocator choice, add a link to a page with benchmarks of various compression algorithms to the compression algorithm prompt option. Changes from v3: Update the zswap doc in Documentation, too. Changes from v4: Use IS_ENABLED() macro to initialize the zswap_enabled variable, make CONFIG_ZSWAP_COMPRESSOR_DEFAULT and CONFIG_ZSWAP_ZPOOL_DEFAULT depend on CONFIG_ZSWAP so they don't show in .config when zswap is deselected in Kconfig. Changes from v5: Add Vitaly's "Reviewed-by" tag. Documentation/vm/zswap.rst | 20 +++++--- mm/Kconfig | 118 ++++++++++++++++++++++++++++++++++++++++++++- mm/zswap.c | 24 ++++----- 3 files changed, 141 insertions(+), 21 deletions(-) diff --git a/Documentation/vm/zswap.rst b/Documentation/vm/zswap.rst index 1444ecd40911..2df6ee6b7a1d 100644 --- a/Documentation/vm/zswap.rst +++ b/Documentation/vm/zswap.rst @@ -35,9 +35,11 @@ Zswap evicts pages from compressed cache on an LRU basis to the backing swap device when the compressed pool reaches its size limit. This requirement had been identified in prior community discussions. -Zswap is disabled by default but can be enabled at boot time by setting -the ``enabled`` attribute to 1 at boot time. ie: ``zswap.enabled=1``. Zswap -can also be enabled and disabled at runtime using the sysfs interface. +Whether Zswap is enabled at the boot time depends on whether +the ``CONFIG_ZSWAP_DEFAULT_ON`` Kconfig option is enabled or not. +This setting can then be overridden by providing the kernel command line +``zswap.enabled=`` option, for example ``zswap.enabled=0``. +Zswap can also be enabled and disabled at runtime using the sysfs interface. An example command to enable zswap at runtime, assuming sysfs is mounted at ``/sys``, is:: @@ -64,9 +66,10 @@ allocation in zpool is not directly accessible by address. Rather, a handle is returned by the allocation routine and that handle must be mapped before being accessed. The compressed memory pool grows on demand and shrinks as compressed pages are freed. The pool is not preallocated. By default, a zpool -of type zbud is created, but it can be selected at boot time by -setting the ``zpool`` attribute, e.g. ``zswap.zpool=zbud``. It can -also be changed at runtime using the sysfs ``zpool`` attribute, e.g.:: +of type selected in ``CONFIG_ZSWAP_ZPOOL_DEFAULT`` Kconfig option is created, +but it can be overridden at boot time by setting the ``zpool`` attribute, +e.g. ``zswap.zpool=zbud``. It can also be changed at runtime using the sysfs +``zpool`` attribute, e.g.:: echo zbud > /sys/module/zswap/parameters/zpool @@ -97,8 +100,9 @@ controlled policy: * max_pool_percent - The maximum percentage of memory that the compressed pool can occupy. -The default compressor is lzo, but it can be selected at boot time by -setting the ``compressor`` attribute, e.g. ``zswap.compressor=lzo``. +The default compressor is selected in ``CONFIG_ZSWAP_COMPRESSOR_DEFAULT`` +Kconfig option, but it can be overridden at boot time by setting the +``compressor`` attribute, e.g. ``zswap.compressor=lzo``. It can also be changed at runtime using the sysfs "compressor" attribute, e.g.:: diff --git a/mm/Kconfig b/mm/Kconfig index ab80933be65f..1209240bfbe0 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -526,7 +526,6 @@ config MEM_SOFT_DIRTY config ZSWAP bool "Compressed cache for swap pages (EXPERIMENTAL)" depends on FRONTSWAP && CRYPTO=y - select CRYPTO_LZO select ZPOOL help A lightweight compressed cache for swap pages. It takes @@ -542,6 +541,123 @@ config ZSWAP they have not be fully explored on the large set of potential configurations and workloads that exist. +choice + prompt "Compressed cache for swap pages default compressor" + depends on ZSWAP + default ZSWAP_COMPRESSOR_DEFAULT_LZO + help + Selects the default compression algorithm for the compressed cache + for swap pages. + + For an overview what kind of performance can be expected from + a particular compression algorithm please refer to the benchmarks + available at the following LWN page: + https://lwn.net/Articles/751795/ + + If in doubt, select 'LZO'. + + The selection made here can be overridden by using the kernel + command line 'zswap.compressor=' option. + +config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE + bool "Deflate" + select CRYPTO_DEFLATE + help + Use the Deflate algorithm as the default compression algorithm. + +config ZSWAP_COMPRESSOR_DEFAULT_LZO + bool "LZO" + select CRYPTO_LZO + help + Use the LZO algorithm as the default compression algorithm. + +config ZSWAP_COMPRESSOR_DEFAULT_842 + bool "842" + select CRYPTO_842 + help + Use the 842 algorithm as the default compression algorithm. + +config ZSWAP_COMPRESSOR_DEFAULT_LZ4 + bool "LZ4" + select CRYPTO_LZ4 + help + Use the LZ4 algorithm as the default compression algorithm. + +config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC + bool "LZ4HC" + select CRYPTO_LZ4HC + help + Use the LZ4HC algorithm as the default compression algorithm. + +config ZSWAP_COMPRESSOR_DEFAULT_ZSTD + bool "zstd" + select CRYPTO_ZSTD + help + Use the zstd algorithm as the default compression algorithm. +endchoice + +config ZSWAP_COMPRESSOR_DEFAULT + string + depends on ZSWAP + default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE + default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO + default "842" if ZSWAP_COMPRESSOR_DEFAULT_842 + default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4 + default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC + default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD + default "" + +choice + prompt "Compressed cache for swap pages default allocator" + depends on ZSWAP + default ZSWAP_ZPOOL_DEFAULT_ZBUD + help + Selects the default allocator for the compressed cache for + swap pages. + The default is 'zbud' for compatibility, however please do + read the description of each of the allocators below before + making a right choice. + + The selection made here can be overridden by using the kernel + command line 'zswap.zpool=' option. + +config ZSWAP_ZPOOL_DEFAULT_ZBUD + bool "zbud" + select ZBUD + help + Use the zbud allocator as the default allocator. + +config ZSWAP_ZPOOL_DEFAULT_Z3FOLD + bool "z3fold" + select Z3FOLD + help + Use the z3fold allocator as the default allocator. + +config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC + bool "zsmalloc" + select ZSMALLOC + help + Use the zsmalloc allocator as the default allocator. +endchoice + +config ZSWAP_ZPOOL_DEFAULT + string + depends on ZSWAP + default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD + default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD + default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC + default "" + +config ZSWAP_DEFAULT_ON + bool "Enable the compressed cache for swap pages by default" + depends on ZSWAP + help + If selected, the compressed cache for swap pages will be enabled + at boot, otherwise it will be disabled. + + The selection made here can be overridden by using the kernel + command line 'zswap.enabled=' option. + config ZPOOL tristate "Common API for compressed memory storage" help diff --git a/mm/zswap.c b/mm/zswap.c index 46a322316e52..1af303e88008 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -71,8 +71,8 @@ #define ZSWAP_PARAM_UNSET "" -/* Enable/disable zswap (disabled by default) */ -static bool zswap_enabled; +/* Enable/disable zswap */ +static bool zswap_enabled = IS_ENABLED(CONFIG_ZSWAP_DEFAULT_ON); static int zswap_enabled_param_set(const char *, const struct kernel_param *); static struct kernel_param_ops zswap_enabled_param_ops = { @@ -82,8 +82,7 @@ static int zswap_enabled_param_set(const char *, module_param_cb(enabled, &zswap_enabled_param_ops, &zswap_enabled, 0644); /* Crypto compressor to use */ -#define ZSWAP_COMPRESSOR_DEFAULT "lzo" -static char *zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT; +static char *zswap_compressor = CONFIG_ZSWAP_COMPRESSOR_DEFAULT; static int zswap_compressor_param_set(const char *, const struct kernel_param *); static struct kernel_param_ops zswap_compressor_param_ops = { @@ -95,8 +94,7 @@ static int zswap_compressor_param_set(const char *, &zswap_compressor, 0644); /* Compressed storage zpool to use */ -#define ZSWAP_ZPOOL_DEFAULT "zbud" -static char *zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT; +static char *zswap_zpool_type = CONFIG_ZSWAP_ZPOOL_DEFAULT; static int zswap_zpool_param_set(const char *, const struct kernel_param *); static struct kernel_param_ops zswap_zpool_param_ops = { .set = zswap_zpool_param_set, @@ -569,11 +567,12 @@ static __init struct zswap_pool *__zswap_pool_create_fallback(void) bool has_comp, has_zpool; has_comp = crypto_has_comp(zswap_compressor, 0, 0); - if (!has_comp && strcmp(zswap_compressor, ZSWAP_COMPRESSOR_DEFAULT)) { + if (!has_comp && strcmp(zswap_compressor, + CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) { pr_err("compressor %s not available, using default %s\n", - zswap_compressor, ZSWAP_COMPRESSOR_DEFAULT); + zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT); param_free_charp(&zswap_compressor); - zswap_compressor = ZSWAP_COMPRESSOR_DEFAULT; + zswap_compressor = CONFIG_ZSWAP_COMPRESSOR_DEFAULT; has_comp = crypto_has_comp(zswap_compressor, 0, 0); } if (!has_comp) { @@ -584,11 +583,12 @@ static __init struct zswap_pool *__zswap_pool_create_fallback(void) } has_zpool = zpool_has_pool(zswap_zpool_type); - if (!has_zpool && strcmp(zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT)) { + if (!has_zpool && strcmp(zswap_zpool_type, + CONFIG_ZSWAP_ZPOOL_DEFAULT)) { pr_err("zpool %s not available, using default %s\n", - zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT); + zswap_zpool_type, CONFIG_ZSWAP_ZPOOL_DEFAULT); param_free_charp(&zswap_zpool_type); - zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT; + zswap_zpool_type = CONFIG_ZSWAP_ZPOOL_DEFAULT; has_zpool = zpool_has_pool(zswap_zpool_type); } if (!has_zpool) {