Considering that zsmalloc has already supported writeback capability and zswap LRU optimization, changing the default allocator of zpool in zswap from zbud to zsmalloc.
Nhat Pham (1): zswap: change zswap's default allocator to zsmalloc
Ze Zuo (1): openeuler_defconfig: set ZSWAP_ZPOOL_DEFAULT to ZSMALLOC
arch/arm64/configs/openeuler_defconfig | 6 +++--- arch/x86/configs/openeuler_defconfig | 6 +++--- mm/Kconfig | 1 + 3 files changed, 7 insertions(+), 6 deletions(-)
From: Nhat Pham nphamcs@gmail.com
mainline inclusion from mainline-v6.7-rc1 commit 64d4d49c5f3bd9a8a24f52d1e9d16af1b368114b category: other bugzilla: https://gitee.com/openeuler/kernel/issues/I9009T
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Out of zswap's 3 allocators, zsmalloc is the clear superior in terms of memory utilization, both in theory and as observed in practice, with its high storage density and low internal fragmentation. zsmalloc is also more actively developed and maintained, since it is the allocator of choice for zswap for many users, as well as the only allocator for zram.
A historical objection to the selection of zsmalloc as the default allocator for zswap is its lack of writeback capability. However, this has changed, with the zsmalloc writeback patchset, and the subsequent zswap LRU refactor. With this, there is not a lot of good reasons to keep zbud, an otherwise inferior allocator, as the default instead of zswap.
This patch changes the default allocator to zsmalloc. The only exception is on settings without MMU, in which case zbud will remain as the default.
Link: https://lkml.kernel.org/r/20230908235115.2943486-1-nphamcs@gmail.com Signed-off-by: Nhat Pham nphamcs@gmail.com Acked-by: Johannes Weiner hannes@cmpxchg.org Acked-by: Yosry Ahmed yosryahmed@google.com Cc: Dan Streetman ddstreet@ieee.org Cc: Domenico Cerasuolo cerasuolodomenico@gmail.com Cc: Seth Jennings sjenning@redhat.com Cc: Vitaly Wool vitaly.wool@konsulko.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Ze Zuo zuoze1@huawei.com --- mm/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/mm/Kconfig b/mm/Kconfig index f45bc11c1cb2..3fb2892594cd 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -130,6 +130,7 @@ config ZSWAP_COMPRESSOR_DEFAULT choice prompt "Default allocator" depends on ZSWAP + default ZSWAP_ZPOOL_DEFAULT_ZSMALLOC if MMU default ZSWAP_ZPOOL_DEFAULT_ZBUD help Selects the default allocator for the compressed cache for
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9009T
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Change the default allocator of zswap to zsmalloc for x86, arm64 by default.
Signed-off-by: Ze Zuo zuoze1@huawei.com --- arch/arm64/configs/openeuler_defconfig | 6 +++--- arch/x86/configs/openeuler_defconfig | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/configs/openeuler_defconfig b/arch/arm64/configs/openeuler_defconfig index 2ddea5999010..3dc61a666695 100644 --- a/arch/arm64/configs/openeuler_defconfig +++ b/arch/arm64/configs/openeuler_defconfig @@ -1051,10 +1051,10 @@ CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO=y # CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4HC is not set # CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD is not set CONFIG_ZSWAP_COMPRESSOR_DEFAULT="lzo" -CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD=y +# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD is not set # CONFIG_ZSWAP_ZPOOL_DEFAULT_Z3FOLD is not set -# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC is not set -CONFIG_ZSWAP_ZPOOL_DEFAULT="zbud" +CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC=y +CONFIG_ZSWAP_ZPOOL_DEFAULT="zsmalloc" CONFIG_ZBUD=y # CONFIG_Z3FOLD is not set CONFIG_ZSMALLOC=y diff --git a/arch/x86/configs/openeuler_defconfig b/arch/x86/configs/openeuler_defconfig index 77f0c7ae79c1..3938bece28d5 100644 --- a/arch/x86/configs/openeuler_defconfig +++ b/arch/x86/configs/openeuler_defconfig @@ -1059,10 +1059,10 @@ CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZO=y # CONFIG_ZSWAP_COMPRESSOR_DEFAULT_LZ4HC is not set # CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD is not set CONFIG_ZSWAP_COMPRESSOR_DEFAULT="lzo" -CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD=y +# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZBUD is not set # CONFIG_ZSWAP_ZPOOL_DEFAULT_Z3FOLD is not set -# CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC is not set -CONFIG_ZSWAP_ZPOOL_DEFAULT="zbud" +CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC=y +CONFIG_ZSWAP_ZPOOL_DEFAULT="zsmalloc" CONFIG_ZBUD=y # CONFIG_Z3FOLD is not set CONFIG_ZSMALLOC=y
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