From: Aaro Koskinen <aaro.koskinen@iki.fi>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Pekka Enberg <penberg@kernel.org>,
Hyeonggon Yoo <42.hyeyoo@gmail.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Matthew Wilcox <willy@infradead.org>,
patches@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
Janusz Krzysztofik <jmkrzyszt@gmail.com>,
Tony Lindgren <tony@atomide.com>, Jonas Bonn <jonas@southpole.se>,
Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
Stafford Horne <shorne@gmail.com>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
Rich Felker <dalias@libc.org>, Arnd Bergmann <arnd@arndb.de>,
Josh Triplett <josh@joshtriplett.org>,
Conor Dooley <conor@kernel.org>,
Damien Le Moal <damien.lemoal@opensource.wdc.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
openrisc@lists.librecores.org, linux-riscv@lists.infradead.org,
linux-sh@vger.kernel.org
Subject: Re: [PATCH 12/12] mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED
Date: Mon, 21 Nov 2022 20:41:21 +0200 [thread overview]
Message-ID: <20221121184121.GB2095@darkstar.musicnaut.iki.fi> (raw)
In-Reply-To: <20221121171202.22080-13-vbabka@suse.cz>
Hi,
On Mon, Nov 21, 2022 at 06:12:02PM +0100, Vlastimil Babka wrote:
> As explained in [1], we would like to remove SLOB if possible.
>
> - There are no known users that need its somewhat lower memory footprint
> so much that they cannot handle SLUB (after some modifications by the
> previous patches) instead.
>
> - It is an extra maintenance burden, and a number of features are
> incompatible with it.
>
> - It blocks the API improvement of allowing kfree() on objects allocated
> via kmem_cache_alloc().
>
> As the first step, rename the CONFIG_SLOB option in the slab allocator
> configuration choice to CONFIG_SLOB_DEPRECATED. Add CONFIG_SLOB
> depending on CONFIG_SLOB_DEPRECATED as an internal option to avoid code
> churn. This will cause existing .config files and defconfigs with
> CONFIG_SLOB=y to silently switch to the default (and recommended
> replacement) SLUB, while still allowing SLOB to be configured by anyone
> that notices and needs it. But those should contact the slab maintainers
> and linux-mm@kvack.org as explained in the updated help. With no valid
> objections, the plan is to update the existing defconfigs to SLUB and
> remove SLOB in a few cycles.
>
> To make SLUB more suitable replacement for SLOB, a CONFIG_SLUB_TINY
> option was introduced to limit SLUB's memory overhead.
> There is a number of defconfigs specifying CONFIG_SLOB=y. As part of
> this patch, update them to select CONFIG_SLUB and CONFIG_SLUB_TINY.
>
> [1] https://lore.kernel.org/all/b35c3f82-f67b-2103-7d82-7a7ba7521439@suse.cz/
>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi> # OMAP1
A.
> Cc: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Jonas Bonn <jonas@southpole.se>
> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
> Cc: Stafford Horne <shorne@gmail.com>
> Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
> Cc: Rich Felker <dalias@libc.org>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Cc: Josh Triplett <josh@joshtriplett.org>
> Cc: Conor Dooley <conor@kernel.org>
> Cc: Damien Le Moal <damien.lemoal@opensource.wdc.com>
> Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: <linux-arm-kernel@lists.infradead.org>
> Cc: <linux-omap@vger.kernel.org>
> Cc: <openrisc@lists.librecores.org>
> Cc: <linux-riscv@lists.infradead.org>
> Cc: <linux-sh@vger.kernel.org>
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
> ---
> arch/arm/configs/clps711x_defconfig | 3 ++-
> arch/arm/configs/collie_defconfig | 3 ++-
> arch/arm/configs/multi_v4t_defconfig | 3 ++-
> arch/arm/configs/omap1_defconfig | 3 ++-
> arch/arm/configs/pxa_defconfig | 3 ++-
> arch/arm/configs/tct_hammer_defconfig | 3 ++-
> arch/arm/configs/xcep_defconfig | 3 ++-
> arch/openrisc/configs/or1ksim_defconfig | 3 ++-
> arch/openrisc/configs/simple_smp_defconfig | 3 ++-
> arch/riscv/configs/nommu_k210_defconfig | 3 ++-
> arch/riscv/configs/nommu_k210_sdcard_defconfig | 3 ++-
> arch/riscv/configs/nommu_virt_defconfig | 3 ++-
> arch/sh/configs/rsk7201_defconfig | 3 ++-
> arch/sh/configs/rsk7203_defconfig | 3 ++-
> arch/sh/configs/se7206_defconfig | 3 ++-
> arch/sh/configs/shmin_defconfig | 3 ++-
> arch/sh/configs/shx3_defconfig | 3 ++-
> kernel/configs/tiny.config | 5 +++--
> mm/Kconfig | 17 +++++++++++++++--
> 19 files changed, 52 insertions(+), 21 deletions(-)
>
> diff --git a/arch/arm/configs/clps711x_defconfig b/arch/arm/configs/clps711x_defconfig
> index 92481b2a88fa..adcee238822a 100644
> --- a/arch/arm/configs/clps711x_defconfig
> +++ b/arch/arm/configs/clps711x_defconfig
> @@ -14,7 +14,8 @@ CONFIG_ARCH_EDB7211=y
> CONFIG_ARCH_P720T=y
> CONFIG_AEABI=y
> # CONFIG_COREDUMP is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_NET=y
> CONFIG_PACKET=y
> CONFIG_UNIX=y
> diff --git a/arch/arm/configs/collie_defconfig b/arch/arm/configs/collie_defconfig
> index 2a2d2cb3ce2e..69341c33e0cc 100644
> --- a/arch/arm/configs/collie_defconfig
> +++ b/arch/arm/configs/collie_defconfig
> @@ -13,7 +13,8 @@ CONFIG_CMDLINE="noinitrd root=/dev/mtdblock2 rootfstype=jffs2 fbcon=rotate:1"
> CONFIG_FPE_NWFPE=y
> CONFIG_PM=y
> # CONFIG_SWAP is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_NET=y
> CONFIG_PACKET=y
> CONFIG_UNIX=y
> diff --git a/arch/arm/configs/multi_v4t_defconfig b/arch/arm/configs/multi_v4t_defconfig
> index e2fd822f741a..b60000a89aff 100644
> --- a/arch/arm/configs/multi_v4t_defconfig
> +++ b/arch/arm/configs/multi_v4t_defconfig
> @@ -25,7 +25,8 @@ CONFIG_ARM_CLPS711X_CPUIDLE=y
> CONFIG_JUMP_LABEL=y
> CONFIG_PARTITION_ADVANCED=y
> # CONFIG_COREDUMP is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_MTD=y
> CONFIG_MTD_CMDLINE_PARTS=y
> CONFIG_MTD_BLOCK=y
> diff --git a/arch/arm/configs/omap1_defconfig b/arch/arm/configs/omap1_defconfig
> index 70511fe4b3ec..246f1bba7df5 100644
> --- a/arch/arm/configs/omap1_defconfig
> +++ b/arch/arm/configs/omap1_defconfig
> @@ -42,7 +42,8 @@ CONFIG_MODULE_FORCE_UNLOAD=y
> CONFIG_PARTITION_ADVANCED=y
> CONFIG_BINFMT_MISC=y
> # CONFIG_SWAP is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_VM_EVENT_COUNTERS is not set
> CONFIG_NET=y
> CONFIG_PACKET=y
> diff --git a/arch/arm/configs/pxa_defconfig b/arch/arm/configs/pxa_defconfig
> index d60cc9cc4c21..0a0f12df40b5 100644
> --- a/arch/arm/configs/pxa_defconfig
> +++ b/arch/arm/configs/pxa_defconfig
> @@ -49,7 +49,8 @@ CONFIG_PARTITION_ADVANCED=y
> CONFIG_LDM_PARTITION=y
> CONFIG_CMDLINE_PARTITION=y
> CONFIG_BINFMT_MISC=y
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_COMPACTION is not set
> CONFIG_NET=y
> CONFIG_PACKET=y
> diff --git a/arch/arm/configs/tct_hammer_defconfig b/arch/arm/configs/tct_hammer_defconfig
> index 3b29ae1fb750..6bd38b6f22c4 100644
> --- a/arch/arm/configs/tct_hammer_defconfig
> +++ b/arch/arm/configs/tct_hammer_defconfig
> @@ -19,7 +19,8 @@ CONFIG_FPE_NWFPE=y
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> # CONFIG_SWAP is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_NET=y
> CONFIG_PACKET=y
> CONFIG_UNIX=y
> diff --git a/arch/arm/configs/xcep_defconfig b/arch/arm/configs/xcep_defconfig
> index ea59e4b6bfc5..6bd9f71b71fc 100644
> --- a/arch/arm/configs/xcep_defconfig
> +++ b/arch/arm/configs/xcep_defconfig
> @@ -26,7 +26,8 @@ CONFIG_MODULE_UNLOAD=y
> CONFIG_MODVERSIONS=y
> CONFIG_MODULE_SRCVERSION_ALL=y
> # CONFIG_BLOCK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_COMPAT_BRK is not set
> # CONFIG_VM_EVENT_COUNTERS is not set
> CONFIG_NET=y
> diff --git a/arch/openrisc/configs/or1ksim_defconfig b/arch/openrisc/configs/or1ksim_defconfig
> index 6e1e004047c7..0116e465238f 100644
> --- a/arch/openrisc/configs/or1ksim_defconfig
> +++ b/arch/openrisc/configs/or1ksim_defconfig
> @@ -10,7 +10,8 @@ CONFIG_EXPERT=y
> # CONFIG_AIO is not set
> # CONFIG_VM_EVENT_COUNTERS is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_MODULES=y
> # CONFIG_BLOCK is not set
> CONFIG_OPENRISC_BUILTIN_DTB="or1ksim"
> diff --git a/arch/openrisc/configs/simple_smp_defconfig b/arch/openrisc/configs/simple_smp_defconfig
> index ff49d868e040..b990cb6c9309 100644
> --- a/arch/openrisc/configs/simple_smp_defconfig
> +++ b/arch/openrisc/configs/simple_smp_defconfig
> @@ -16,7 +16,8 @@ CONFIG_EXPERT=y
> # CONFIG_AIO is not set
> # CONFIG_VM_EVENT_COUNTERS is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_MODULES=y
> # CONFIG_BLOCK is not set
> CONFIG_OPENRISC_BUILTIN_DTB="simple_smp"
> diff --git a/arch/riscv/configs/nommu_k210_defconfig b/arch/riscv/configs/nommu_k210_defconfig
> index 96fe8def644c..79b3ccd58ff0 100644
> --- a/arch/riscv/configs/nommu_k210_defconfig
> +++ b/arch/riscv/configs/nommu_k210_defconfig
> @@ -25,7 +25,8 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> CONFIG_EMBEDDED=y
> # CONFIG_VM_EVENT_COUNTERS is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_MMU is not set
> CONFIG_SOC_CANAAN=y
> CONFIG_NONPORTABLE=y
> diff --git a/arch/riscv/configs/nommu_k210_sdcard_defconfig b/arch/riscv/configs/nommu_k210_sdcard_defconfig
> index 379740654373..6b80bb13b8ed 100644
> --- a/arch/riscv/configs/nommu_k210_sdcard_defconfig
> +++ b/arch/riscv/configs/nommu_k210_sdcard_defconfig
> @@ -17,7 +17,8 @@ CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> CONFIG_EMBEDDED=y
> # CONFIG_VM_EVENT_COUNTERS is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_MMU is not set
> CONFIG_SOC_CANAAN=y
> CONFIG_NONPORTABLE=y
> diff --git a/arch/riscv/configs/nommu_virt_defconfig b/arch/riscv/configs/nommu_virt_defconfig
> index 1a56eda5ce46..4cf0f297091e 100644
> --- a/arch/riscv/configs/nommu_virt_defconfig
> +++ b/arch/riscv/configs/nommu_virt_defconfig
> @@ -22,7 +22,8 @@ CONFIG_EXPERT=y
> # CONFIG_KALLSYMS is not set
> # CONFIG_VM_EVENT_COUNTERS is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_MMU is not set
> CONFIG_SOC_VIRT=y
> CONFIG_NONPORTABLE=y
> diff --git a/arch/sh/configs/rsk7201_defconfig b/arch/sh/configs/rsk7201_defconfig
> index 619c18699459..376e95fa77bc 100644
> --- a/arch/sh/configs/rsk7201_defconfig
> +++ b/arch/sh/configs/rsk7201_defconfig
> @@ -10,7 +10,8 @@ CONFIG_USER_NS=y
> CONFIG_PID_NS=y
> CONFIG_BLK_DEV_INITRD=y
> # CONFIG_AIO is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_PROFILING=y
> CONFIG_MODULES=y
> # CONFIG_BLK_DEV_BSG is not set
> diff --git a/arch/sh/configs/rsk7203_defconfig b/arch/sh/configs/rsk7203_defconfig
> index d00fafc021e1..1d5fd67a3949 100644
> --- a/arch/sh/configs/rsk7203_defconfig
> +++ b/arch/sh/configs/rsk7203_defconfig
> @@ -11,7 +11,8 @@ CONFIG_USER_NS=y
> CONFIG_PID_NS=y
> CONFIG_BLK_DEV_INITRD=y
> CONFIG_KALLSYMS_ALL=y
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_PROFILING=y
> CONFIG_MODULES=y
> # CONFIG_BLK_DEV_BSG is not set
> diff --git a/arch/sh/configs/se7206_defconfig b/arch/sh/configs/se7206_defconfig
> index 122216123e63..78e0e7be57ee 100644
> --- a/arch/sh/configs/se7206_defconfig
> +++ b/arch/sh/configs/se7206_defconfig
> @@ -21,7 +21,8 @@ CONFIG_BLK_DEV_INITRD=y
> CONFIG_KALLSYMS_ALL=y
> # CONFIG_ELF_CORE is not set
> # CONFIG_COMPAT_BRK is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_PROFILING=y
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> diff --git a/arch/sh/configs/shmin_defconfig b/arch/sh/configs/shmin_defconfig
> index c0b6f40d01cc..e078b193a78a 100644
> --- a/arch/sh/configs/shmin_defconfig
> +++ b/arch/sh/configs/shmin_defconfig
> @@ -9,7 +9,8 @@ CONFIG_LOG_BUF_SHIFT=14
> # CONFIG_FUTEX is not set
> # CONFIG_EPOLL is not set
> # CONFIG_SHMEM is not set
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> # CONFIG_BLK_DEV_BSG is not set
> CONFIG_CPU_SUBTYPE_SH7706=y
> CONFIG_MEMORY_START=0x0c000000
> diff --git a/arch/sh/configs/shx3_defconfig b/arch/sh/configs/shx3_defconfig
> index 32ec6eb1eabc..aa353dff7f19 100644
> --- a/arch/sh/configs/shx3_defconfig
> +++ b/arch/sh/configs/shx3_defconfig
> @@ -20,7 +20,8 @@ CONFIG_USER_NS=y
> CONFIG_PID_NS=y
> # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
> CONFIG_KALLSYMS_ALL=y
> -CONFIG_SLOB=y
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> CONFIG_PROFILING=y
> CONFIG_KPROBES=y
> CONFIG_MODULES=y
> diff --git a/kernel/configs/tiny.config b/kernel/configs/tiny.config
> index 8a44b93da0f3..c2f9c912df1c 100644
> --- a/kernel/configs/tiny.config
> +++ b/kernel/configs/tiny.config
> @@ -7,5 +7,6 @@ CONFIG_KERNEL_XZ=y
> # CONFIG_KERNEL_LZO is not set
> # CONFIG_KERNEL_LZ4 is not set
> # CONFIG_SLAB is not set
> -# CONFIG_SLUB is not set
> -CONFIG_SLOB=y
> +# CONFIG_SLOB_DEPRECATED is not set
> +CONFIG_SLUB=y
> +CONFIG_SLUB_TINY=y
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 5941cb34e30d..dcc49c69552f 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -219,17 +219,30 @@ config SLUB
> and has enhanced diagnostics. SLUB is the default choice for
> a slab allocator.
>
> -config SLOB
> +config SLOB_DEPRECATED
> depends on EXPERT
> - bool "SLOB (Simple Allocator)"
> + bool "SLOB (Simple Allocator - DEPRECATED)"
> depends on !PREEMPT_RT
> help
> + Deprecated and scheduled for removal in a few cycles. SLUB
> + recommended as replacement. CONFIG_SLUB_TINY can be considered
> + on systems with 16MB or less RAM.
> +
> + If you need SLOB to stay, please contact linux-mm@kvack.org and
> + people listed in the SLAB ALLOCATOR section of MAINTAINERS file,
> + with your use case.
> +
> SLOB replaces the stock allocator with a drastically simpler
> allocator. SLOB is generally more space efficient but
> does not perform as well on large systems.
>
> endchoice
>
> +config SLOB
> + bool
> + default y
> + depends on SLOB_DEPRECATED
> +
> config SLUB_TINY
> bool "Configure SLUB for minimal memory footprint"
> depends on SLUB && EXPERT
> --
> 2.38.1
>
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next prev parent reply other threads:[~2022-11-21 18:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-21 17:11 [PATCH 00/12] Introduce CONFIG_SLUB_TINY and deprecate SLOB Vlastimil Babka
2022-11-21 17:12 ` [PATCH 12/12] mm, slob: rename CONFIG_SLOB to CONFIG_SLOB_DEPRECATED Vlastimil Babka
2022-11-21 18:41 ` Aaro Koskinen [this message]
2022-11-21 19:42 ` Vlastimil Babka
2022-11-22 6:47 ` Damien Le Moal
2022-11-22 16:08 ` Arnd Bergmann
2022-11-24 1:21 ` Roman Gushchin
2022-12-02 17:59 ` Palmer Dabbelt
2022-12-05 12:25 ` Damien Le Moal
2022-12-13 13:41 ` Hyeonggon Yoo
2022-11-22 16:33 ` [PATCH 00/12] Introduce CONFIG_SLUB_TINY and deprecate SLOB Arnd Bergmann
2022-11-22 16:59 ` Vlastimil Babka
2022-11-22 17:15 ` Arnd Bergmann
2022-11-24 20:30 ` Mike Rapoport
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