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authorSergey Senozhatsky <senozhatsky@chromium.org>2023-01-18 03:52:09 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-03 09:33:23 +0300
commit4ff93b292c0b91b9a7c9fb54643f122bbe59d8d0 (patch)
treea36d556a6791f114d710da25d592a71fa8f4ed03 /mm/zsmalloc.c
parente1d1f3546913ae0af9da31df8183a6f3da0cd590 (diff)
downloadlinux-4ff93b292c0b91b9a7c9fb54643f122bbe59d8d0.tar.xz
zsmalloc: make zspage chain size configurable
Remove hard coded limit on the maximum number of physical pages per-zspage. This will allow tuning of zsmalloc pool as zspage chain size changes `pages per-zspage` and `objects per-zspage` characteristics of size classes which also affects size classes clustering (the way size classes are merged). Link: https://lkml.kernel.org/r/20230118005210.2814763-4-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/zsmalloc.c')
-rw-r--r--mm/zsmalloc.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 7b904f9bed70..3aed46ab7e6c 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -73,13 +73,6 @@
*/
#define ZS_ALIGN 8
-/*
- * A single 'zspage' is composed of up to 2^N discontiguous 0-order (single)
- * pages. ZS_MAX_ZSPAGE_ORDER defines upper limit on N.
- */
-#define ZS_MAX_ZSPAGE_ORDER 2
-#define ZS_MAX_PAGES_PER_ZSPAGE (_AC(1, UL) << ZS_MAX_ZSPAGE_ORDER)
-
#define ZS_HANDLE_SIZE (sizeof(unsigned long))
/*
@@ -136,10 +129,13 @@
#define HUGE_BITS 1
#define FULLNESS_BITS 2
#define CLASS_BITS 8
-#define ISOLATED_BITS 3
+#define ISOLATED_BITS 5
#define MAGIC_VAL_BITS 8
#define MAX(a, b) ((a) >= (b) ? (a) : (b))
+
+#define ZS_MAX_PAGES_PER_ZSPAGE (_AC(CONFIG_ZSMALLOC_CHAIN_SIZE, UL))
+
/* ZS_MIN_ALLOC_SIZE must be multiple of ZS_ALIGN */
#define ZS_MIN_ALLOC_SIZE \
MAX(32, (ZS_MAX_PAGES_PER_ZSPAGE << PAGE_SHIFT >> OBJ_INDEX_BITS))