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Eric Biggers 9769378133 dm-bufio: remove maximum age based eviction 
Every 30 seconds, dm-bufio evicts all buffers that were not accessed
within the last max_age_seconds, except those pinned in memory via
retain_bytes.  By default max_age_seconds is 300 (i.e. 5 minutes), and
retain_bytes is 262144 (i.e. 256 KiB) per dm-bufio client.

This eviction algorithm is much too eager and is also redundant with the
shinker based eviction.

Testing on an Android phone shows that about 30 MB of dm-bufio buffers
(from dm-verity Merkle tree blocks) are loaded at boot time, and then
about 90% of them are suddenly thrown away 5 minutes after boot.  This
results in unnecessary Merkle tree I/O later.

Meanwhile, if the system actually encounters memory pressure, testing
also shows that the shrinker is effective at evicting the buffers.

Other major Linux kernel caches, such as the page cache, do not enforce
a maximum age, instead relying on the shrinker.

For these reasons, Android is now setting max_age_seconds to 86400
(i.e. 1 day), which mostly disables it; see
cadad290a7%5E%21/

That is a much better default, but really the maximum age based eviction
should not exist at all.  Let's remove it.

Note that this also eliminates the need to run work every 30 seconds,
which is beneficial too.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
 		2025-05-04 11:35:05 +02:00
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accel treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
accessibility treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
acpi libnvdimm additions for 6.15 2025-04-02 20:27:18 -07:00
amba
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android
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ata treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
atm treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
auxdisplay treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
base treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
bcma
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block treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
bluetooth treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
bus treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
cache
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cdrom
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cdx
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char treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
clk ARM and clkdev updates for 6.15-rc1 2025-04-03 12:21:44 -07:00
clocksource RISC-V Patches for the 6.15 Merge Window, Part 1 2025-04-04 09:49:17 -07:00
comedi treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
connector
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counter Char/Misc fixes for 6.15-rc1 2025-04-02 18:03:34 -07:00
cpufreq treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
cpuidle
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crypto treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
cxl cxl for v6.15 2025-04-02 20:04:43 -07:00
dax
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dca
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devfreq
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dio
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dma treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dma-buf treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dpll
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edac
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eisa
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extcon
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firewire treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
firmware treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
fpga
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fsi
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fwctl
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gnss
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gpio Networking changes for 6.15. 2025-03-26 21:48:21 -07:00
gpu A set of final cleanups for the timer subsystem: 2025-04-06 08:35:37 -07:00
greybus treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
hid treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
hsi treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
hte treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
hv - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
hwmon treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
hwspinlock
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hwtracing Char/Misc/IIO driver updates for 6.15-rc1 2025-04-01 11:26:08 -07:00
i2c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
i3c i3c: Add NULL pointer check in i3c_master_queue_ibi() 2025-03-31 11:44:00 +02:00
idle
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iio treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
infiniband treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
input A set of final cleanups for the timer subsystem: 2025-04-06 08:35:37 -07:00
interconnect
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iommu treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
ipack
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irqchip irqdomain: Rename irq_get_default_host() to irq_get_default_domain() 2025-04-04 16:39:10 +02:00
isdn treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
leds treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
macintosh treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
mailbox treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
mcb
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md dm-bufio: remove maximum age based eviction 2025-05-04 11:35:05 +02:00
media treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
memory treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
memstick treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
message SCSI misc on 20250326 2025-03-26 19:57:34 -07:00
mfd * Maxim MAX77705: 2025-03-29 14:33:13 -07:00
misc treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
mmc treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
most treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
mtd treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
mux
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net treewide: Convert new and leftover hrtimer_init() users 2025-04-05 10:30:17 +02:00
nfc treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
ntb Bug fixes for NTB Switchtec driver mw negative shift, Intel NTB link 2025-04-04 14:23:07 -07:00
nubus
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nvdimm libnvdimm additions for 6.15 2025-04-02 20:27:18 -07:00
nvme treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
nvmem
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of Devicetree for v6.15: 2025-03-29 11:23:16 -07:00
opp
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parisc
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parport treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
pci treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
pcmcia treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
peci
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perf pci-v6.15-changes 2025-03-28 19:36:53 -07:00
phy phy-for-6.15 2025-04-01 12:47:11 -07:00
pinctrl Pin control changes for the v6.15 kernel cycle: 2025-03-29 16:59:16 -07:00
platform treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
pmdomain
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pnp Staging driver updates for 6.15-rc1 2025-04-02 18:09:17 -07:00
power i2c-for-6.15-rc1 2025-04-01 14:21:02 -07:00
powercap
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pps treewide: Convert new and leftover hrtimer_init() users 2025-04-05 10:30:17 +02:00
ps3
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ptp treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
pwm Pin control changes for the v6.15 kernel cycle: 2025-03-29 16:59:16 -07:00
rapidio
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ras
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regulator These are objtool fixes and updates by Josh Poimboeuf, centered 2025-04-02 10:30:10 -07:00
remoteproc
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reset remoteproc updates for v6.15 2025-03-29 17:18:50 -07:00
rpmsg
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rtc treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
s390 treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
sbus
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scsi treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
sh
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siox
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slimbus
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soc soc: drivers for 6.15, part 2 2025-04-04 09:06:32 -07:00
soundwire soundwire updates for 6.15 2025-04-01 12:43:13 -07:00
spi spi: Fixes for v6.15 2025-04-04 09:09:34 -07:00
spmi
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ssb
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staging treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
target treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
tc
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tee
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thermal More thermal control updates for 6.15-rc1 2025-04-01 16:51:44 -07:00
thunderbolt USB/Thunderbolt update for 6.15-rc1 2025-04-02 18:23:31 -07:00
tty treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
ufs Revert "Merge tag 'irq-msi-2025-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip" 2025-03-28 11:22:54 -07:00
uio
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usb treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
vdpa
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vfio VFIO updates for v6.15-rc1 2025-04-01 19:35:19 -07:00
vhost virtio: features, fixes, cleanups 2025-04-01 18:52:54 -07:00
video treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
virt treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
virtio virtio: features, fixes, cleanups 2025-04-01 18:52:54 -07:00
w1
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watchdog treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
xen - The 6 patch series "Enable strict percpu address space checks" from 2025-04-01 09:29:18 -07:00
zorro
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Kconfig
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Makefile
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