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| author | Vlastimil Babka <vbabka@suse.cz> | 2022-11-21 11:44:54 +0100 |
|---|---|---|
| committer | Vlastimil Babka <vbabka@suse.cz> | 2022-11-27 23:38:53 +0100 |
| commit | 90ce872c22b248724d1c87232410e3b38536e107 (patch) | |
| tree | d1b3d89e7c05361bef1b3317fc5599e13112396f | |
| parent | 5a8a3c1f73c6488d1a2c18ac1f5308b1fd2aa5f0 (diff) | |
| download | linux-90ce872c22b248724d1c87232410e3b38536e107.tar.bz2 | |
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>
| -rw-r--r-- | mm/slub.c | 3 |
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; /* |