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authorVlastimil Babka <vbabka@suse.cz>2022-11-21 13:44:54 +0300
committerVlastimil Babka <vbabka@suse.cz>2022-11-28 01:38:53 +0300
commit90ce872c22b248724d1c87232410e3b38536e107 (patch)
treed1b3d89e7c05361bef1b3317fc5599e13112396f /mm/slub.c
parent5a8a3c1f73c6488d1a2c18ac1f5308b1fd2aa5f0 (diff)
downloadlinux-90ce872c22b248724d1c87232410e3b38536e107.tar.xz
mm, slub: lower the default slub_max_order with CONFIG_SLUB_TINY
With CONFIG_SLUB_TINY we want to minimize memory overhead. By lowering the default slub_max_order we can make slab allocations use smaller pages. However depending on object sizes, order-0 might not be the best due to increased fragmentation. When testing on a 8MB RAM k210 system by Damien Le Moal [1], slub_max_order=1 had the best results, so use that as the default for CONFIG_SLUB_TINY. [1] https://lore.kernel.org/all/6a1883c4-4c3f-545a-90e8-2cd805bcf4ae@opensource.wdc.com/ Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Roman Gushchin <roman.gushchin@linux.dev> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Christoph Lameter <cl@linux.com>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/slub.c b/mm/slub.c
index 19b6cf74bdfc..f4c7f4e3751f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3888,7 +3888,8 @@ EXPORT_SYMBOL(kmem_cache_alloc_bulk);
* take the list_lock.
*/
static unsigned int slub_min_order;
-static unsigned int slub_max_order = PAGE_ALLOC_COSTLY_ORDER;
+static unsigned int slub_max_order =
+ IS_ENABLED(CONFIG_SLUB_TINY) ? 1 : PAGE_ALLOC_COSTLY_ORDER;
static unsigned int slub_min_objects;
/*