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kernel_optimize_test/drivers
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Mel Gorman 453f85d43f mm: remove __GFP_COLD 
As the page free path makes no distinction between cache hot and cold
pages, there is no real useful ordering of pages in the free list that
allocation requests can take advantage of.  Juding from the users of
__GFP_COLD, it is likely that a number of them are the result of copying
other sites instead of actually measuring the impact.  Remove the
__GFP_COLD parameter which simplifies a number of paths in the page
allocator.

This is potentially controversial but bear in mind that the size of the
per-cpu pagelists versus modern cache sizes means that the whole per-cpu
list can often fit in the L3 cache.  Hence, there is only a potential
benefit for microbenchmarks that alloc/free pages in a tight loop.  It's
even worse when THP is taken into account which has little or no chance
of getting a cache-hot page as the per-cpu list is bypassed and the
zeroing of multiple pages will thrash the cache anyway.

The truncate microbenchmarks are not shown as this patch affects the
allocation path and not the free path.  A page fault microbenchmark was
tested but it showed no sigificant difference which is not surprising
given that the __GFP_COLD branches are a miniscule percentage of the
fault path.

Link: http://lkml.kernel.org/r/20171018075952.10627-9-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-15 18:21:06 -08:00
..
accessibility
acpi arm64 updates for 4.15 2017-11-15 10:56:56 -08:00
amba A couple of dma-mapping updates: 2017-11-14 16:54:12 -08:00
android
ata Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
atm Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
auxdisplay Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
base DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
bcma This is the bulk of GPIO changes for the v4.15 kernel cycle: 2017-11-14 17:23:44 -08:00
block drivers/block/zram/zram_drv.c: make zram_page_end_io() static 2017-11-15 18:21:05 -08:00
bluetooth
bus arm64 updates for 4.15 2017-11-15 10:56:56 -08:00
cdrom Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
char kmemcheck: remove annotations 2017-11-15 18:21:04 -08:00
clk
clocksource arm64 updates for 4.15 2017-11-15 10:56:56 -08:00
connector
cpufreq Power management updates for v4.15-rc1 2017-11-13 19:43:50 -08:00
cpuidle Merge branch 'pm-cpuidle' 2017-11-13 01:34:14 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2017-11-14 10:52:09 -08:00
dax
dca
devfreq Merge branches 'pm-devfreq' and 'pm-tools' 2017-11-13 01:41:39 +01:00
dio
dma dmaengine updates for 4.15-rc1 2017-11-14 16:49:31 -08:00
dma-buf
edac Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 12:38:26 -08:00
eisa
extcon USB/PHY patches for 4.15-rc1 2017-11-13 21:14:07 -08:00
firewire Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
firmware
fmc
fpga
fsi
gpio Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
gpu mm: remove cold parameter for release_pages 2017-11-15 18:21:06 -08:00
hid Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
hsi Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
hv x86/virt: Add enum for hypervisors to replace x86_hyper 2017-11-10 10:03:12 +01:00
hwmon hwmon updates for v4.15 2017-11-13 08:55:46 -08:00
hwspinlock
hwtracing A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
i2c Merge branch 'i2c/for-4.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-11-14 17:52:21 -08:00
ide Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
idle Merge branch 'pm-cpuidle' 2017-11-13 01:34:14 +01:00
iio A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
infiniband drivers/infiniband/sw/rdmavt/qp.c: use kmalloc_array_node() 2017-11-15 18:21:02 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-11-14 18:07:18 -08:00
iommu IOMMU Updates for Linux v4.15 2017-11-14 16:43:27 -08:00
ipack
irqchip Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:33:11 -08:00
isdn
leds LED updates for 4.15rc1 2017-11-14 18:09:31 -08:00
lightnvm Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
macintosh Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
mailbox ACPI updates for v4.15-rc1 2017-11-13 20:08:22 -08:00
mcb
md This is the bulk of GPIO changes for the v4.15 kernel cycle: 2017-11-14 17:23:44 -08:00
media Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2017-11-14 18:07:18 -08:00
memory
memstick Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
message
mfd sound updates for 4.15-rc1 2017-11-14 18:01:46 -08:00
misc kmemcheck: remove annotations 2017-11-15 18:21:04 -08:00
mmc MMC core: 2017-11-13 10:17:35 -08:00
mtd
mux
net mm: remove __GFP_COLD 2017-11-15 18:21:06 -08:00
nfc Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
ntb
nubus m68k updates for 4.15 2017-11-13 12:10:24 -08:00
nvdimm bdi: introduce BDI_CAP_SYNCHRONOUS_IO 2017-11-15 18:21:02 -08:00
nvme Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
nvmem
of DeviceTree for 4.15: 2017-11-14 18:25:40 -08:00
opp
oprofile
parisc
parport Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
pci A couple of dma-mapping updates: 2017-11-14 16:54:12 -08:00
pcmcia Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
perf arm64 updates for 4.15 2017-11-15 10:56:56 -08:00
phy USB/PHY patches for 4.15-rc1 2017-11-13 21:14:07 -08:00
pinctrl This is the bulk of GPIO changes for the v4.15 kernel cycle: 2017-11-14 17:23:44 -08:00
platform Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
pnp
power Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
powercap
pps
ps3
ptp
pwm
rapidio
ras Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
regulator MMC core: 2017-11-13 10:17:35 -08:00
remoteproc
reset
rpmsg
rtc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
s390 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
sbus
scsi Merge branch 'for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2017-11-15 10:14:11 -08:00
sfi
sh A couple of dma-mapping updates: 2017-11-14 16:54:12 -08:00
sn
soc USB/PHY patches for 4.15-rc1 2017-11-13 21:14:07 -08:00
spi Merge remote-tracking branches 'spi/topic/sh-msiof', 'spi/topic/slave', 'spi/topic/spreadtrum' and 'spi/topic/tegra114' into spi-next 2017-11-10 21:33:51 +00:00
spmi
ssb
staging mm: remove __GFP_COLD 2017-11-15 18:21:06 -08:00
target A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
tc
tee
thermal
thunderbolt
tty TTY/Serial patches for 4.15-rc1 2017-11-13 21:05:31 -08:00
uio
usb sound updates for 4.15-rc1 2017-11-14 18:01:46 -08:00
uwb
vfio VFIO Updates for Linux v4.15 2017-11-14 16:47:47 -08:00
vhost
video
virt
virtio
vlynq
vme
w1
watchdog Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
xen Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
zorro
Kconfig Merge branches 'pm-cpufreq-sched' and 'pm-opp' 2017-11-13 01:40:52 +01:00
Makefile Merge branches 'pm-cpufreq-sched' and 'pm-opp' 2017-11-13 01:40:52 +01:00