linux/mm
Christoph Lameter 331dc558fa slub: Support 4k kmallocs again to compensate for page allocator slowness
Currently we hand off PAGE_SIZEd kmallocs to the page allocator in the
mistaken belief that the page allocator can handle these allocations
effectively. However, measurements indicate a minimum slowdown by the
factor of 8 (and that is only SMP, NUMA is much worse) vs the slub fastpath
which causes regressions in tbench.

Increase the number of kmalloc caches by one so that we again handle 4k
kmallocs directly from slub. 4k page buffering for the page allocator
will be performed by slub like done by slab.

At some point the page allocator fastpath should be fixed. A lot of the kernel
would benefit from a faster ability to allocate a single page. If that is
done then the 4k allocs may again be forwarded to the page allocator and this
patch could be reverted.

Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
2008-02-14 15:30:02 -08:00
..
Kconfig sh: Bump number of quicklists for SH-5. 2008-01-28 13:18:55 +09:00
Makefile Memory controller: cgroups setup 2008-02-07 08:42:18 -08:00
allocpercpu.c PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage 2008-02-06 10:41:04 -08:00
backing-dev.c mm/backing-dev.c: fix percpu_counter_destroy call bug in bdi_init 2007-12-05 09:21:18 -08:00
bootmem.c Introduce flags for reserve_bootmem() 2008-02-07 08:42:25 -08:00
bounce.c block: Initial support for data-less (or empty) barrier support 2007-10-16 11:03:56 +02:00
dmapool.c pool: Improve memory usage for devices which can't cross boundaries 2007-12-04 10:39:58 -05:00
fadvise.c check ADVICE of fadvise64_64 even if get_xip_page is given 2008-02-05 09:44:19 -08:00
filemap.c remove final fastcall users 2008-02-13 16:21:18 -08:00
filemap_xip.c Use pgoff_t instead of unsigned long 2008-02-08 09:22:32 -08:00
fremap.c sys_remap_file_pages: fix ->vm_file accounting 2008-02-05 09:44:07 -08:00
highmem.c mm: remove fastcall from mm/ 2008-02-05 09:44:18 -08:00
hugetlb.c hugetlb: fix overcommit locking 2008-02-13 16:21:18 -08:00
internal.h set_page_refcounted() VM_BUG_ON fix 2008-02-05 09:44:19 -08:00
madvise.c speed up madvise_need_mmap_write() usage 2007-07-16 09:05:36 -07:00
memcontrol.c memcontrol: add vm_match_cgroup() 2008-02-09 11:08:33 -08:00
memory.c Be more robust about bad arguments in get_user_pages() 2008-02-11 20:44:44 -08:00
memory_hotplug.c Page allocator: clean up pcp draining functions 2008-02-05 09:44:17 -08:00
mempolicy.c mempolicy: silently restrict nodemask to allowed nodes 2008-02-11 20:48:29 -08:00
mempool.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
migrate.c bugfix for memory cgroup controller: migration under memory controller fix 2008-02-07 08:42:19 -08:00
mincore.c [PATCH] mincore: vma crossing fix 2007-02-15 09:57:03 -08:00
mlock.c do not limit locked memory when RLIMIT_MEMLOCK is RLIM_INFINITY 2007-07-16 09:05:37 -07:00
mmap.c mm: special mapping nopage 2008-02-08 18:57:39 -08:00
mmzone.c
mprotect.c fix mprotect vma_wants_writenotify prot 2007-10-23 08:32:06 -07:00
mremap.c sparse pointer use of zero as null 2007-10-18 14:37:31 -07:00
msync.c Detach sched.h from mm.h 2007-05-21 09:18:19 -07:00
nommu.c nommu: add new vmalloc_user() and remap_vmalloc_range() interfaces. 2008-02-05 09:44:21 -08:00
oom_kill.c oom: add sysctl to enable task memory dump 2008-02-07 08:42:19 -08:00
page-writeback.c writeback: speed up writeback of big dirty files 2008-02-05 09:44:19 -08:00
page_alloc.c misc: removal of final callers using fastcall 2008-02-08 09:22:31 -08:00
page_io.c mm: fix PageUptodate data race 2008-02-05 09:44:19 -08:00
page_isolation.c memory hotremove: unset migrate type "ISOLATE" after removal 2007-11-14 18:45:38 -08:00
pagewalk.c maps4: introduce a generic page walker 2008-02-05 09:44:16 -08:00
pdflush.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
prio_tree.c spelling fixes: mm/ 2007-10-20 01:27:18 +02:00
quicklist.c quicklists: Only consider memory that can be used with GFP_KERNEL 2008-01-14 08:52:22 -08:00
readahead.c mm: bdi init hooks 2007-10-17 08:42:45 -07:00
rmap.c memcontrol: add vm_match_cgroup() 2008-02-09 11:08:33 -08:00
shmem.c mount-options-fix-tmpfs-fix 2008-02-08 09:22:41 -08:00
shmem_acl.c
slab.c slab: avoid double initialization & do initialization in 1 place 2008-02-14 15:30:01 -08:00
slob.c slob: reduce external fragmentation by using three free lists 2008-02-05 09:44:19 -08:00
slub.c slub: Support 4k kmallocs again to compensate for page allocator slowness 2008-02-14 15:30:02 -08:00
sparse-vmemmap.c memory hotplug fix: fix section mismatch in vmammap_allock_block() 2007-11-29 09:24:54 -08:00
sparse.c mm: fix section mismatch warning in sparse.c 2008-02-05 09:44:19 -08:00
swap.c Memory controller: add per cgroup LRU and reclaim 2008-02-07 08:42:18 -08:00
swap_state.c memcgroup: revert swap_state mods 2008-02-07 08:42:20 -08:00
swapfile.c memcgroup: reinstate swapoff mod 2008-02-07 08:42:19 -08:00
thrash.c Bug in mm/thrash.c function grab_swap_token() 2007-05-11 08:29:32 -07:00
tiny-shmem.c Remove unused code from mm/tiny-shmem.c 2008-02-05 09:44:17 -08:00
truncate.c page migraton: handle orphaned pages 2008-02-05 09:44:19 -08:00
util.c fix mm/util.c:krealloc() 2007-11-14 18:45:41 -08:00
vmalloc.c CONFIG_HIGHPTE vs. sub-page page tables. 2008-02-08 09:22:42 -08:00
vmscan.c per-zone and reclaim enhancements for memory controller: modifies vmscan.c for isolate globa/cgroup lru activity 2008-02-07 08:42:22 -08:00
vmstat.c vmstat: remove prefetch 2008-02-05 09:44:18 -08:00