FAILED: patch "[PATCH] mm: z3fold: deprecate CONFIG_Z3FOLD" failed to apply to 6.6-stable tree
Subsystems (5)
[email protected]
maintainerThe patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 7a2369b74abf76cd3e54c45b30f6addb497f831b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024100710-snout-expiring-3cbb@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..
Possible dependencies:
7a2369b74abf ("mm: z3fold: deprecate CONFIG_Z3FOLD")04cb7502a5d7 ("zsmalloc: use all available 24 bits of page_type")43d746dc49bb ("mm/zsmalloc: use a proper page type")8db00ad56461 ("mm: allow reuse of the lower 16 bit of the page type with an actual type") 6d21dde7adc0 ("mm: update _mapcount and page_type documentation")ff202303c398 ("mm: convert page type macros to enum")46df8e73a4a3 ("mm: free up PG_slab")d99e3140a4d3 ("mm: turn folio_test_hugetlb into a PageType")fd1a745ce03e ("mm: support page_mapcount() on page_has_type() pages")29cfe7556bfd ("mm: constify more page/folio tests")443cbaf9e2fd ("crash: split vmcoreinfo exporting code out from crash_core.c")85fcde402db1 ("kexec: split crashkernel reservation code out from crash_core.c")55c49fee57af ("mm/vmalloc: remove vmap_area_list")d093602919ad ("mm: vmalloc: remove global vmap_area_root rb-tree")7fa8cee00316 ("mm: vmalloc: move vmap_init_free_space() down in vmalloc.c")4a693ce65b18 ("kdump: defer the insertion of crashkernel resources")9f2a63523582 ("Merge tag 'mm-nonmm-stable-2024-01-09-10-33' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 7a2369b74abf76cd3e54c45b30f6addb497f831b Mon Sep 17 00:00:00 2001
From: Yosry Ahmed <[email protected]>
Date: Wed, 4 Sep 2024 23:33:43 +0000
Subject: [PATCH] mm: z3fold: deprecate CONFIG_Z3FOLD
The z3fold compressed pages allocator is rarely used, most users use zsmalloc. The only disadvantage of zsmalloc in comparison is the dependency on MMU, and zbud is a more common option for !MMU as it was the default zswap allocator for a long time.
Historically, zsmalloc had worse latency than zbud and z3fold but offered better memory savings. This is no longer the case as shown by a simple recent analysis [1]. That analysis showed that z3fold does not have any advantage over zsmalloc or zbud considering both performance and memory usage. In a kernel build test on tmpfs in a limited cgroup, z3fold took 3% more time and used 1.8% more memory. The latency of zswap_load() was 7% higher, and that of zswap_store() was 10% higher. Zsmalloc is better in all metrics.
Moreover, z3fold apparently has latent bugs, which was made noticeable by a recent soft lockup bug report with z3fold [2]. Switching to zsmalloc not only fixed the problem, but also reduced the swap usage from 6~8G to 1~2G. Other users have also reported being bitten by mistakenly enabling z3fold.
Other than hurting users, z3fold is repeatedly causing wasted engineering effort. Apart from investigating the above bug, it came up in multiple development discussions (e.g. [3]) as something we need to handle, when there aren't any legit users (at least not intentionally).
The natural course of action is to deprecate z3fold, and remove in a few cycles if no objections are raised from active users. Next on the list should be zbud, as it offers marginal latency gains at the cost of huge memory waste when compared to zsmalloc. That one will need to wait until zsmalloc does not depend on MMU.
Rename the user-visible config option from CONFIG_Z3FOLD to CONFIG_Z3FOLD_DEPRECATED so that users with CONFIG_Z3FOLD=y get a new prompt with explanation during make oldconfig. Also, remove CONFIG_Z3FOLD=y from defconfigs.
[1]https://lore.kernel.org/lkml/CAJD7tkbRF6od-2x_L8-A1QL3=2Ww13sCj4S3i4bNndqF+3+_Vg@mail.gmail.com/ [2]https://lore.kernel.org/lkml/[email protected]/ [3]https://lore.kernel.org/lkml/CAJD7tkbnmeVugfunffSovJf9FAgy9rhBVt_tx=nxUveLUfqVsA@mail.gmail.com/
arch/loongarch/configs/loongson3_defconfig +0 -1
@@ -96,7 +96,6 @@ CONFIG_ZPOOL=y CONFIG_ZSWAP=y CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD=y CONFIG_ZBUD=y -CONFIG_Z3FOLD=y CONFIG_ZSMALLOC=m # CONFIG_COMPAT_BRK is not set CONFIG_MEMORY_HOTPLUG=y
arch/powerpc/configs/ppc64_defconfig +0 -1
@@ -81,7 +81,6 @@ CONFIG_MODULE_SIG_SHA512=y CONFIG_PARTITION_ADVANCED=y CONFIG_BINFMT_MISC=m CONFIG_ZSWAP=y -CONFIG_Z3FOLD=y CONFIG_ZSMALLOC=y # CONFIG_SLAB_MERGE_DEFAULT is not set CONFIG_SLAB_FREELIST_RANDOM=y
mm/Kconfig +19 -6
@@ -146,12 +146,15 @@ config ZSWAP_ZPOOL_DEFAULT_ZBUD help Use the zbud allocator as the default allocator. -config ZSWAP_ZPOOL_DEFAULT_Z3FOLD - bool "z3fold" - select Z3FOLD +config ZSWAP_ZPOOL_DEFAULT_Z3FOLD_DEPRECATED + bool "z3foldi (DEPRECATED)" + select Z3FOLD_DEPRECATED help Use the z3fold allocator as the default allocator. + Deprecated and scheduled for removal in a few cycles, + see CONFIG_Z3FOLD_DEPRECATED. + config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC bool "zsmalloc" select ZSMALLOC
@@ -163,7 +166,7 @@ config ZSWAP_ZPOOL_DEFAULT string depends on ZSWAP default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD - default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD + default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD_DEPRECATED default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC default ""
@@ -177,15 +180,25 @@ config ZBUD deterministic reclaim properties that make it preferable to a higher density approach when reclaim will be used. -config Z3FOLD - tristate "3:1 compression allocator (z3fold)" +config Z3FOLD_DEPRECATED + tristate "3:1 compression allocator (z3fold) (DEPRECATED)" depends on ZSWAP help + Deprecated and scheduled for removal in a few cycles. If you have + a good reason for using Z3FOLD over ZSMALLOC, please contact + [email protected] and the zswap maintainers. + A special purpose allocator for storing compressed pages. It is designed to store up to three compressed pages per physical page. It is a ZBUD derivative so the simplicity and determinism are still there. +config Z3FOLD + tristate + default y if Z3FOLD_DEPRECATED=y + default m if Z3FOLD_DEPRECATED=m + depends on Z3FOLD_DEPRECATED + config ZSMALLOC tristate prompt "N:1 compression allocator (zsmalloc)" if (ZSWAP || ZRAM)