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android_kernel_motorola_sm6375/fs/ext4
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Filename Latest commit message Latest commit date
Dmitry Monakhov 79ad149041 ext4: fix extent_status fragmentation for plain files 
[ Upstream commit 4068664e3cd2312610ceac05b74c4cf1853b8325 ]

Extents are cached in read_extent_tree_block(); as a result, extents
are not cached for inodes with depth == 0 when we try to find the
extent using ext4_find_extent().  The result of the lookup is cached
in ext4_map_blocks() but is only a subset of the extent on disk.  As a
result, the contents of extents status cache can get very badly
fragmented for certain workloads, such as a random 4k read workload.

File size of /mnt/test is 33554432 (8192 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..    8191:      40960..     49151:   8192:             last,eof

$ perf record -e 'ext4:ext4_es_*' /root/bin/fio --name=t --direct=0 --rw=randread --bs=4k --filesize=32M --size=32M --filename=/mnt/test
$ perf script | grep ext4_es_insert_extent | head -n 10
             fio   131 [000]    13.975421:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [494/1) mapped 41454 status W
             fio   131 [000]    13.975939:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [6064/1) mapped 47024 status W
             fio   131 [000]    13.976467:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [6907/1) mapped 47867 status W
             fio   131 [000]    13.976937:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [3850/1) mapped 44810 status W
             fio   131 [000]    13.977440:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [3292/1) mapped 44252 status W
             fio   131 [000]    13.977931:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [6882/1) mapped 47842 status W
             fio   131 [000]    13.978376:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [3117/1) mapped 44077 status W
             fio   131 [000]    13.978957:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [2896/1) mapped 43856 status W
             fio   131 [000]    13.979474:           ext4:ext4_es_insert_extent: dev 253,0 ino 12 es [7479/1) mapped 48439 status W

Fix this by caching the extents for inodes with depth == 0 in
ext4_find_extent().

[ Renamed ext4_es_cache_extents() to ext4_cache_extents() since this
  newly added function is not in extents_cache.c, and to avoid
  potential visual confusion with ext4_es_cache_extent().  -TYT ]

Signed-off-by: Dmitry Monakhov <dmonakhov@gmail.com>
Link: https://lore.kernel.org/r/20191106122502.19986-1-dmonakhov@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-04-29 16:32:55 +02:00
..
acl.c
acl.h
balloc.c ext4: fix potential race between online resizing and write operations 2020-02-28 17:22:22 +01:00
bitmap.c
block_validity.c ext4: add cond_resched() to ext4_protect_reserved_inode 2020-02-19 19:52:59 +01:00
dir.c ext4: fix checksum errors with indexed dirs 2020-02-19 19:52:59 +01:00
ext4.h ext4: fix race between writepages and enabling EXT4_EXTENTS_FL 2020-02-28 17:22:23 +01:00
ext4_extents.h
ext4_jbd2.c
ext4_jbd2.h
extents.c ext4: fix extent_status fragmentation for plain files 2020-04-29 16:32:55 +02:00
extents_status.c ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents_status.h ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
file.c ext4: fix ext4_dax_read/write inode locking sequence for IOCB_NOWAIT 2020-02-24 08:36:24 +01:00
fsmap.c
fsmap.h
fsync.c
hash.c ext4: fix kernel oops caused by spurious casefold flag 2019-09-03 01:43:17 -04:00
ialloc.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-28 17:22:22 +01:00
indirect.c
inline.c ext4: set error return correctly when ext4_htree_store_dirent fails 2019-08-12 14:29:38 -04:00
inode.c ext4: use non-movable memory for superblock readahead 2020-04-23 10:36:15 +02:00
ioctl.c Added new ext4 debugging ioctls to allow userspace to get information 2019-09-21 13:37:39 -07:00
Kconfig
Makefile ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
mballoc.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-28 17:22:22 +01:00
mballoc.h
migrate.c ext4: fix race between writepages and enabling EXT4_EXTENTS_FL 2020-02-28 17:22:23 +01:00
mmp.c ext4: don't assume that mmp_nodename/bdevname have NUL 2020-02-19 19:52:58 +01:00
move_extent.c
namei.c ext4: add cond_resched() to __ext4_find_entry() 2020-02-28 17:22:22 +01:00
page-io.c ext4: fix deadlock allocating crypto bounce page from mempool 2020-02-11 04:35:32 -08:00
readpage.c ext4: fix deadlock allocating bio_post_read_ctx from mempool 2020-02-24 08:36:29 +01:00
resize.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-28 17:22:22 +01:00
super.c ext4: do not commit super on read-only bdev 2020-04-23 10:36:35 +02:00
symlink.c
sysfs.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
truncate.h
verity.c ext4: add basic fs-verity support 2019-08-12 19:33:50 -07:00
xattr.c
xattr.h
xattr_security.c
xattr_trusted.c
xattr_user.c