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...
--------------------------------
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