linux/mm
Raghavendra K T 6d2be915e5 mm/readahead.c: fix readahead failure for memoryless NUMA nodes and limit readahead pages
Currently max_sane_readahead() returns zero on the cpu whose NUMA node
has no local memory which leads to readahead failure.  Fix this
readahead failure by returning minimum of (requested pages, 512).  Users
running applications on a memory-less cpu which needs readahead such as
streaming application see considerable boost in the performance.

Result:

fadvise experiment with FADV_WILLNEED on a PPC machine having memoryless
CPU with 1GB testfile (12 iterations) yielded around 46.66% improvement.

fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB
testfile 32GB* 4G RAM numa machine (12 iterations) showed no impact on
the normal NUMA cases w/ patch.

  Kernel       Avg  Stddev
  base      7.4975   3.92%
  patched   7.4174   3.26%

[Andrew: making return value PAGE_SIZE independent]
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-03 16:21:05 -07:00
..
backing-dev.c bdi: avoid oops on device removal 2014-04-03 16:20:49 -07:00
balloon_compaction.c
bootmem.c
bounce.c
cleancache.c
compaction.c mm/compaction.c: mark function as static 2014-04-03 16:21:02 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap_xip.c
filemap.c mm: remove read_cache_page_async() 2014-04-03 16:21:04 -07:00
fremap.c mm: fix bad rss-counter if remap_file_pages raced migration 2014-03-19 16:21:49 -07:00
frontswap.c
highmem.c
huge_memory.c mm, thp: drop do_huge_pmd_wp_zero_page_fallback() 2014-04-03 16:21:04 -07:00
hugetlb_cgroup.c
hugetlb.c mm, hugetlb: mark some bootstrap functions as __init 2014-04-03 16:21:01 -07:00
hwpoison-inject.c
init-mm.c
internal.h mm/page-writeback.c: do not count anon pages as dirtyable memory 2014-01-29 16:22:39 -08:00
interval_tree.c
Kconfig mm/Kconfig: fix URL for zsmalloc benchmark 2014-03-10 17:26:20 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c kmemleak: change some global variables to int 2014-04-03 16:20:50 -07:00
ksm.c mm: close PageTail race 2014-03-04 07:55:47 -08:00
list_lru.c mm: keep page cache radix tree nodes in check 2014-04-03 16:21:01 -07:00
maccess.c
madvise.c
Makefile mm: thrash detection-based file cache sizing 2014-04-03 16:21:01 -07:00
memblock.c memblock: add limit checking to memblock_virt_alloc 2014-01-29 16:22:40 -08:00
memcontrol.c memcg: reparent charges of children before processing parent 2014-03-04 07:55:48 -08:00
memory_hotplug.c mm/memory_hotplug.c: move register_memory_resource out of the lock_memory_hotplug 2014-01-23 16:36:52 -08:00
memory-failure.c mm: close PageTail race 2014-03-04 07:55:47 -08:00
memory.c mm: consolidate code to setup pte 2014-04-03 16:21:04 -07:00
mempolicy.c mm: optimize put_mems_allowed() usage 2014-04-03 16:20:58 -07:00
mempool.c
migrate.c mm: fix swapops.h:131 bug if remap_file_pages raced migration 2014-03-20 22:09:09 -07:00
mincore.c mm + fs: prepare for non-page entries in page cache radix trees 2014-04-03 16:21:00 -07:00
mlock.c
mm_init.c mm: bring back /sys/kernel/mm 2014-01-27 21:02:39 -08:00
mmap.c mm/mmap.c: mark function as static 2014-04-03 16:21:02 -07:00
mmu_context.c sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm 2014-02-21 08:50:17 +01:00
mmu_notifier.c mm: audit/fix non-modular users of module_init in core code 2014-01-23 16:36:52 -08:00
mmzone.c
mprotect.c mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit 2014-02-17 11:19:36 +11:00
mremap.c
msync.c
nobootmem.c mm/nobootmem.c: mark function as static 2014-04-03 16:21:02 -07:00
nommu.c
oom_kill.c mm, oom: base root bonus on current usage 2014-01-30 16:56:56 -08:00
page_alloc.c mm: optimize put_mems_allowed() usage 2014-04-03 16:20:58 -07:00
page_cgroup.c mm/page_cgroup.c: mark functions as static 2014-04-03 16:21:02 -07:00
page_io.c Merge branch 'for-3.14/core' of git://git.kernel.dk/linux-block 2014-01-30 11:19:05 -08:00
page_isolation.c
page-writeback.c mm: __set_page_dirty_nobuffers() uses spin_lock_irqsave() instead of spin_lock_irq() 2014-02-06 13:48:51 -08:00
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c percpu: renew the max_contig if we merge the head and previous block 2014-03-29 09:29:42 -04:00
pgtable-generic.c
process_vm_access.c mm/process_vm_access.c: mark function as static 2014-04-03 16:21:02 -07:00
quicklist.c
readahead.c mm/readahead.c: fix readahead failure for memoryless NUMA nodes and limit readahead pages 2014-04-03 16:21:05 -07:00
rmap.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-03-31 14:35:30 -07:00
shmem.c mm + fs: prepare for non-page entries in page cache radix trees 2014-04-03 16:21:00 -07:00
slab_common.c slab: fix wrong retval on kmem_cache_create_memcg error path 2014-01-29 16:22:40 -08:00
slab.c mm: optimize put_mems_allowed() usage 2014-04-03 16:20:58 -07:00
slab.h
slob.c
slub.c slub: do not drop slab_mutex for sysfs_slab_add 2014-04-03 16:21:05 -07:00
sparse-vmemmap.c
sparse.c sparse: fix comment 2014-04-02 09:16:17 +02:00
swap_state.c swap: add a simple detector for inappropriate swapin readahead 2014-02-06 13:48:51 -08:00
swap.c mm: thrash detection-based file cache sizing 2014-04-03 16:21:01 -07:00
swapfile.c mm/swap: fix race on swap_info reuse between swapoff and swapon 2014-02-06 13:48:51 -08:00
truncate.c mm: keep page cache radix tree nodes in check 2014-04-03 16:21:01 -07:00
util.c
vmalloc.c Revert "mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}" 2014-01-27 21:02:39 -08:00
vmpressure.c arm, pm, vmpressure: add missing slab.h includes 2014-02-03 13:24:01 -05:00
vmscan.c mm: thrash detection-based file cache sizing 2014-04-03 16:21:01 -07:00
vmstat.c drop_caches: add some documentation and info message 2014-04-03 16:21:04 -07:00
workingset.c mm: keep page cache radix tree nodes in check 2014-04-03 16:21:01 -07:00
zbud.c
zsmalloc.c zsmalloc: add copyright 2014-01-30 16:56:55 -08:00
zswap.c