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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
..
bcache treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-vdo treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
persistent-data - fix a spelling error in dm-raid 2025-01-27 17:06:42 -08:00
Kconfig dm-crypt: switch to using the crc32 library 2025-02-03 14:10:10 +01:00
Makefile md: reintroduce md-linear 2025-01-13 07:36:29 -08:00
dm-audit.c
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dm-audit.h
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dm-bio-prison-v1.c dm cache: Remove unused functions in bio-prison-v1 2024-11-20 11:38:04 +01:00
dm-bio-prison-v1.h dm cache: Remove unused functions in bio-prison-v1 2024-11-20 11:38:04 +01:00
dm-bio-prison-v2.c
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dm-bio-prison-v2.h
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dm-bio-record.h
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dm-bufio.c dm-bufio: remove maximum age based eviction 2025-05-04 11:35:05 +02:00
dm-builtin.c
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dm-cache-background-tracker.c dm cache: Remove unused btracker_nr_writebacks_queued 2024-11-20 11:38:04 +01:00
dm-cache-background-tracker.h dm cache: Remove unused btracker_nr_writebacks_queued 2024-11-20 11:38:04 +01:00
dm-cache-block-types.h
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dm-cache-metadata.c dm cache: Remove unused dm_cache_size 2024-11-20 11:38:04 +01:00
dm-cache-metadata.h dm cache: Remove unused dm_cache_size 2024-11-20 11:38:04 +01:00
dm-cache-policy-internal.h
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dm-cache-policy-smq.c
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dm-cache-policy.c
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dm-cache-policy.h
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dm-cache-target.c dm cache: support shrinking the origin device 2025-03-06 16:13:47 +01:00
dm-clone-metadata.c dm: Make use of __assign_bit() API 2024-09-02 16:53:53 +02:00
dm-clone-metadata.h
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dm-clone-target.c block: add a bdev_limits helper 2024-10-29 09:15:00 -06:00
dm-core.h dm: use generic functions instead of disable_discard and disable_write_zeroes 2025-05-04 11:35:05 +02:00
dm-crypt.c dm-crypt: switch to using the crc32 library 2025-02-03 14:10:10 +01:00
dm-delay.c dm-delay: don't busy-wait in kthread 2025-05-04 11:35:05 +02:00
dm-dust.c
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dm-ebs-target.c dm-ebs: fix prefetch-vs-suspend race 2025-03-28 18:26:11 +01:00
dm-era-target.c dm: Constify struct dm_block_validator 2024-07-19 12:08:15 +02:00
dm-exception-store.c
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dm-exception-store.h
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dm-flakey.c dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature 2025-03-13 18:54:11 +01:00
dm-ima.c
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dm-ima.h
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dm-init.c dm init: Handle minors larger than 255 2024-07-02 20:53:41 +02:00
dm-integrity.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-io-rewind.c
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dm-io-tracker.h
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dm-io.c dm-io: Warn on creating multiple atomic write bios for a region 2025-01-17 22:24:09 +01:00
dm-ioctl.c dm ioctl: rate limit a couple of ioctl based error messages 2024-11-20 11:38:04 +01:00
dm-kcopyd.c
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dm-linear.c dm-linear: Enable atomic writes 2025-01-17 22:24:04 +01:00
dm-log-userspace-base.c
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dm-log-userspace-transfer.c
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dm-log-userspace-transfer.h
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dm-log-writes.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-log.c
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dm-mpath.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-mpath.h
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dm-path-selector.c
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dm-path-selector.h
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dm-ps-historical-service-time.c
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dm-ps-io-affinity.c dm: change kzalloc to kcalloc 2025-01-17 22:05:39 +01:00
dm-ps-queue-length.c
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dm-ps-round-robin.c
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dm-ps-service-time.c
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dm-raid.c dm raid: fix spelling errors in raid_ctr() 2025-01-17 22:05:39 +01:00
dm-raid1.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-region-hash.c
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dm-rq.c dm: use generic functions instead of disable_discard and disable_write_zeroes 2025-05-04 11:35:05 +02:00
dm-rq.h
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dm-snap-persistent.c
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dm-snap-transient.c
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dm-snap.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-stats.c
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dm-stats.h
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dm-stripe.c dm: Enable inline crypto passthrough for striped target 2025-02-17 11:48:32 +01:00
dm-switch.c
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dm-sysfs.c
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dm-table.c dm: lock limits when reading them 2025-05-04 11:35:05 +02:00
dm-target.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-thin-metadata.c dm: Constify struct dm_block_validator 2024-07-19 12:08:15 +02:00
dm-thin-metadata.h
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dm-thin.c - dm-array fixes 2025-01-08 10:12:01 -08:00
dm-uevent.c
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dm-uevent.h
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dm-unstripe.c dm-unstriped: cast an operand to sector_t to prevent potential uint32_t overflow 2024-11-04 17:34:56 +01:00
dm-verity-fec.c for-6.14/block-20250118 2025-01-20 19:38:46 -08:00
dm-verity-fec.h dm-verity: always "map" the data blocks 2024-07-03 21:41:11 +02:00
dm-verity-loadpin.c
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dm-verity-target.c dm-verity: use softirq context only when !need_resched() 2025-05-04 11:35:05 +02:00
dm-verity-verify-sig.c dm verity: fallback to platform keyring also if key in trusted keyring is rejected 2024-09-26 17:27:08 +02:00
dm-verity-verify-sig.h
…
dm-verity.h dm-verity: remove the unused "data_start" variable 2024-11-20 11:44:44 +01:00
dm-writecache.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
dm-zero.c dm: always manage discard support in terms of max_hw_discard_sectors 2024-05-20 15:51:19 -04:00
dm-zone.c dm: fix native zone append devices on top of emulated ones 2025-05-04 11:35:05 +02:00
dm-zoned-metadata.c dm: zoned: Remove unused functions 2024-11-20 11:38:04 +01:00
dm-zoned-reclaim.c dm: Fix dm-zoned-reclaim zone write pointer alignment 2024-12-10 09:15:33 -07:00
dm-zoned-target.c dm: stop using blk_limits_io_{min,opt} 2024-07-10 13:10:06 +02:00
dm-zoned.h dm: zoned: Remove unused functions 2024-11-20 11:38:04 +01:00
dm.c dm: use generic functions instead of disable_discard and disable_write_zeroes 2025-05-04 11:35:05 +02:00
dm.h dm: limit swapping tables for devices with zone write plugs 2025-05-04 11:35:05 +02:00
md-autodetect.c md: reintroduce md-linear 2025-01-13 07:36:29 -08:00
md-bitmap.c md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb 2025-03-05 00:34:00 +08:00
md-bitmap.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00
md-cluster.c md: switch md-cluster to use md_submodle_head 2025-03-05 00:28:39 +08:00
md-cluster.h md: switch md-cluster to use md_submodle_head 2025-03-05 00:28:39 +08:00
md-linear.c md: switch personalities to use md_submodule_head 2025-03-05 00:27:20 +08:00
md.c treewide: Switch/rename to timer_delete[_sync]() 2025-04-05 10:30:12 +02:00
md.h Merge tag 'md-6.15-20250312' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux into for-6.15/block 2025-03-13 05:34:51 -06:00
raid0.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid0.h
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raid1-10.c Merge tag 'md-6.15-20250312' of https://git.kernel.org/pub/scm/linux/kernel/git/mdraid/linux into for-6.15/block 2025-03-13 05:34:51 -06:00
raid1.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid1.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00
raid5-cache.c lib/crc32: standardize on crc32c() name for Castagnoli CRC32 2025-02-08 20:06:30 -08:00
raid5-log.h
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raid5-ppl.c lib/crc32: standardize on crc32c() name for Castagnoli CRC32 2025-02-08 20:06:30 -08:00
raid5.c md/raid5: merge reshape_progress checking inside get_reshape_loc() 2025-03-05 00:31:27 +08:00
raid5.h md/md-bitmap: move bitmap_{start, end}write to md upper layer 2025-01-13 08:56:11 -08:00
raid10.c for-6.15/block-20250322 2025-03-26 18:08:55 -07:00
raid10.h md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() 2025-01-13 08:56:10 -08:00