mm, slab: ignore SLAB_RECLAIM_ACCOUNT with CONFIG_SLUB_TINY

SLAB_RECLAIM_ACCOUNT caches allocate their slab pages with
__GFP_RECLAIMABLE and can help against fragmentation by grouping pages
by mobility, but on tiny systems mobility grouping is likely disabled
anyway and ignoring SLAB_RECLAIM_ACCOUNT might instead lead to merging
of caches that are made incompatible just by the flag.

Thus with CONFIG_SLUB_TINY, make SLAB_RECLAIM_ACCOUNT ineffective.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: Christoph Lameter <cl@linux.com>

diff --git a/include/linux/slab.h b/include/linux/slab.h
index ae2d19ec8467418d76709b0dfbfea0fe12c22cc5..37fa41af24b605dac77946b7732726f64edf9124 100644 (file)
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -129,7 +129,11 @@
 
 /* The following flags affect the page allocator grouping pages by mobility */
 /* Objects are reclaimable */
+#ifndef CONFIG_SLUB_TINY
 #define SLAB_RECLAIM_ACCOUNT   ((slab_flags_t __force)0x00020000U)
+#else
+#define SLAB_RECLAIM_ACCOUNT   ((slab_flags_t __force)0)
+#endif
 #define SLAB_TEMPORARY         SLAB_RECLAIM_ACCOUNT    /* Objects are short-lived */
 
 /*