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9f47eb5461aaeb6cb8696f9d11503ae90e4d5cb0
android_kernel_xiaomi_sm8450/fs/btrfs
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Paul E. McKenney 9f47eb5461 fs/btrfs: Add cond_resched() for try_release_extent_mapping() stalls 
Very large I/Os can cause the following RCU CPU stall warning:

RIP: 0010:rb_prev+0x8/0x50
Code: 49 89 c0 49 89 d1 48 89 c2 48 89 f8 e9 e5 fd ff ff 4c 89 48 10 c3 4c =
89 06 c3 4c 89 40 10 c3 0f 1f 00 48 8b 0f 48 39 cf 74 38 <48> 8b 47 10 48 85 c0 74 22 48 8b 50 08 48 85 d2 74 0c 48 89 d0 48
RSP: 0018:ffffc9002212bab0 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13
RAX: ffff888821f93630 RBX: ffff888821f93630 RCX: ffff888821f937e0
RDX: 0000000000000000 RSI: 0000000000102000 RDI: ffff888821f93630
RBP: 0000000000103000 R08: 000000000006c000 R09: 0000000000000238
R10: 0000000000102fff R11: ffffc9002212bac8 R12: 0000000000000001
R13: ffffffffffffffff R14: 0000000000102000 R15: ffff888821f937e0
 __lookup_extent_mapping+0xa0/0x110
 try_release_extent_mapping+0xdc/0x220
 btrfs_releasepage+0x45/0x70
 shrink_page_list+0xa39/0xb30
 shrink_inactive_list+0x18f/0x3b0
 shrink_lruvec+0x38e/0x6b0
 shrink_node+0x14d/0x690
 do_try_to_free_pages+0xc6/0x3e0
 try_to_free_mem_cgroup_pages+0xe6/0x1e0
 reclaim_high.constprop.73+0x87/0xc0
 mem_cgroup_handle_over_high+0x66/0x150
 exit_to_usermode_loop+0x82/0xd0
 do_syscall_64+0xd4/0x100
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

On a PREEMPT=n kernel, the try_release_extent_mapping() function's
"while" loop might run for a very long time on a large I/O.  This commit
therefore adds a cond_resched() to this loop, providing RCU any needed
quiescent states.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2020-06-29 11:58:50 -07:00
..
tests
btrfs: kill the subvol_srcu
2020-03-23 17:02:00 +01:00
acl.c
btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter
2019-04-29 19:02:44 +02:00
async-thread.c
Btrfs: fix crash during unmount due to race with delayed inode workers
2020-03-23 17:01:51 +01:00
async-thread.h
Btrfs: fix crash during unmount due to race with delayed inode workers
2020-03-23 17:01:51 +01:00
backref.c
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
backref.h
btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE
2020-05-25 11:25:35 +02:00
block-group.c
btrfs: fix race between block group removal and block group creation
2020-06-16 19:20:58 +02:00
block-group.h
btrfs: move the block group freeze/unfreeze helpers into block-group.c
2020-05-25 11:25:30 +02:00
block-rsv.c
btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE
2020-05-25 11:25:35 +02:00
block-rsv.h
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
btrfs_inode.h
Revert "btrfs: remove BTRFS_INODE_READDIO_NEED_LOCK"
2020-06-09 19:21:48 +02:00
check-integrity.c
btrfs: remove buffer_heads form super block mirror integrity checking
2020-03-23 17:01:40 +01:00
check-integrity.h
btrfs: remove btrfsic_submit_bh()
2020-03-23 17:01:39 +01:00
compression.c
btrfs: unexport btrfs_compress_set_level()
2020-05-25 11:25:37 +02:00
compression.h
btrfs: unexport btrfs_compress_set_level()
2020-05-25 11:25:37 +02:00
ctree.c
btrfs: remove redundant local variable in read_block_for_search
2020-05-28 14:01:52 +02:00
ctree.h
btrfs: check if a log root exists before locking the log_mutex on unlink
2020-06-16 19:22:23 +02:00
delalloc-space.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
delalloc-space.h
btrfs: migrate the delalloc space stuff to it's own home
2019-07-04 17:26:17 +02:00
delayed-inode.c
btrfs: use nofs allocations for running delayed items
2020-03-25 16:26:00 +01:00
delayed-inode.h
btrfs: delayed-inode: Replace zero-length array with flexible-array member
2020-03-23 17:01:53 +01:00
delayed-ref.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
delayed-ref.h
btrfs: migrate the delayed refs rsv code
2019-07-04 17:26:17 +02:00
dev-replace.c
btrfs: sysfs, rename device_link add/remove functions
2020-03-23 17:01:35 +01:00
dev-replace.h
btrfs: add __pure attribute to functions
2019-11-18 12:46:52 +01:00
dir-item.c
btrfs: remove unused parameter fs_info from btrfs_extend_item
2019-04-29 19:02:50 +02:00
discard.c
btrfs: add correction to handle -1 edge case in async discard
2020-01-20 16:41:01 +01:00
discard.h
btrfs: discard: Use the correct style for SPDX License Identifier
2020-04-20 17:43:42 +02:00
disk-io.c
Merge tag 'for-5.8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2020-06-02 19:59:25 -07:00
disk-io.h
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
export.c
btrfs: simplify iget helpers
2020-05-25 11:25:37 +02:00
export.h
btrfs: export helpers for subvolume name/id resolution
2020-03-23 17:01:42 +01:00
extent_io.c
fs/btrfs: Add cond_resched() for try_release_extent_mapping() stalls
2020-06-29 11:58:50 -07:00
extent_io.h
Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2020-06-05 16:19:28 -07:00
extent_map.c
Btrfs: fix race between using extent maps and merging them
2020-02-12 17:16:46 +01:00
extent_map.h
btrfs: remove extent_map::bdev
2019-11-18 23:43:44 +01:00
extent-io-tree.h
btrfs: fix corrupt log due to concurrent fsync of inodes with shared extents
2020-05-25 11:25:37 +02:00
extent-tree.c
btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE
2020-05-25 11:25:35 +02:00
file-item.c
btrfs: remove useless 'fail_unlock' label from btrfs_csum_file_blocks()
2020-05-25 11:25:37 +02:00
file.c
btrfs: fix RWF_NOWAIT writes blocking on extent locks and waiting for IO
2020-06-16 19:22:45 +02:00
free-space-cache.c
btrfs: turn space cache writeout failure messages into debug messages
2020-05-25 11:25:38 +02:00
free-space-cache.h
btrfs: have multiple discard lists
2020-01-20 16:41:00 +01:00
free-space-tree.c
btrfs: move the root freeing stuff into btrfs_put_root
2020-03-23 17:01:59 +01:00
free-space-tree.h
btrfs: rename btrfs_block_group_cache
2019-11-18 17:51:51 +01:00
inode-item.c
btrfs: Make btrfs_find_name_in_ext_backref return struct btrfs_inode_extref
2019-09-09 14:59:16 +02:00
inode-map.c
btrfs: Remove __ prefix from btrfs_block_rsv_release
2020-03-23 17:01:55 +01:00
inode-map.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
inode.c
Merge tag 'for-5.8-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2020-06-23 09:20:11 -07:00
ioctl.c
btrfs: use kfree() in btrfs_ioctl_get_subvol_info()
2020-06-16 19:24:03 +02:00
Kconfig
Revert "btrfs: switch to iomap_dio_rw() for dio"
2020-06-14 01:19:02 +02:00
locking.c
btrfs: add missing annotation for btrfs_tree_lock()
2020-05-25 11:25:16 +02:00
locking.h
btrfs: Implement DREW lock
2020-03-23 17:01:43 +01:00
lzo.c
btrfs: compression: inline free_workspace
2019-11-18 12:46:59 +01:00
Makefile
Btrfs: move all reflink implementation code into its own file
2020-03-23 17:01:54 +01:00
misc.h
btrfs: rename tree_entry to rb_simple_node and export it
2020-05-25 11:25:19 +02:00
ordered-data.c
btrfs: drop argument tree from btrfs_lock_and_flush_ordered_range
2020-03-23 17:01:34 +01:00
ordered-data.h
btrfs: drop argument tree from btrfs_lock_and_flush_ordered_range
2020-03-23 17:01:34 +01:00
orphan.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
print-tree.c
btrfs: Remove unneeded semicolon
2020-01-20 16:40:55 +01:00
print-tree.h
btrfs: print-tree: debugging output enhancement
2018-04-20 19:18:16 +02:00
props.c
btrfs: simplify iget helpers
2020-05-25 11:25:37 +02:00
props.h
btrfs: delete unused function btrfs_set_prop_trans
2019-04-29 19:02:54 +02:00
qgroup.c
btrfs: qgroup: mark qgroup inconsistent if we're inherting snapshot to a new qgroup
2020-05-25 11:25:29 +02:00
qgroup.h
btrfs: destroy qgroup extent records on transaction abort
2020-02-19 00:35:54 +01:00
raid56.c
btrfs: use struct_size to calculate size of raid hash table
2020-03-23 17:01:44 +01:00
raid56.h
btrfs: constify map parameter for nr_parity_stripes and nr_data_stripes
2019-07-01 13:34:58 +02:00
rcu-string.h
btrfs: rcu-string: Replace zero-length array with flexible-array member
2020-03-23 17:01:53 +01:00
reada.c
btrfs: rename btrfs_block_group_cache
2019-11-18 17:51:51 +01:00
ref-verify.c
btrfs: fix ref-verify to catch operations on 0 ref extents
2020-03-23 17:01:56 +01:00
ref-verify.h
btrfs: ref-verify: Use btrfs_ref to refactor btrfs_ref_tree_mod()
2019-04-29 19:02:49 +02:00
reflink.c
btrfs: fix lost i_size update after cloning inline extent
2020-04-08 19:10:34 +02:00
reflink.h
Btrfs: move all reflink implementation code into its own file
2020-03-23 17:01:54 +01:00
relocation.c
btrfs: simplify iget helpers
2020-05-25 11:25:37 +02:00
root-tree.c
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
scrub.c
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
send.c
Merge tag 'for-5.8-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
2020-06-02 19:59:25 -07:00
send.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
space-info.c
btrfs: remove pointless assertion on reclaim_size counter
2020-05-25 11:25:23 +02:00
space-info.h
btrfs: improve global reserve stealing logic
2020-05-25 11:25:22 +02:00
struct-funcs.c
btrfs: update documentation of set/get helpers
2020-05-25 11:25:35 +02:00
super.c
btrfs: simplify iget helpers
2020-05-25 11:25:37 +02:00
sysfs.c
btrfs: sysfs: Use scnprintf() instead of snprintf()
2020-03-23 18:14:47 +01:00
sysfs.h
btrfs: sysfs, rename device_link add/remove functions
2020-03-23 17:01:35 +01:00
transaction.c
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
transaction.h
btrfs: improve global reserve stealing logic
2020-05-25 11:25:22 +02:00
tree-checker.c
btrfs: tree-checker: remove duplicate definition of 'inode_item_err'
2020-05-25 11:25:23 +02:00
tree-checker.h
btrfs: get fs_info from eb in btrfs_check_chunk_valid
2019-04-29 19:02:39 +02:00
tree-defrag.c
btrfs: rename BTRFS_ROOT_REF_COWS to BTRFS_ROOT_SHAREABLE
2020-05-25 11:25:35 +02:00
tree-log.c
btrfs: check if a log root exists before locking the log_mutex on unlink
2020-06-16 19:22:23 +02:00
tree-log.h
btrfs: get fs_info from trans in btrfs_set_log_full_commit
2019-04-29 19:02:41 +02:00
ulist.c
btrfs: replace GPL boilerplate by SPDX -- sources
2018-04-12 16:29:51 +02:00
ulist.h
btrfs: replace GPL boilerplate by SPDX -- headers
2018-04-12 16:29:46 +02:00
uuid-tree.c
btrfs: simplify root lookup by id
2020-05-25 11:25:36 +02:00
volumes.c
btrfs: drop stale reference to volume_mutex
2020-05-25 11:25:35 +02:00
volumes.h
btrfs: introduce chunk allocation policy
2020-03-23 17:01:48 +01:00
xattr.c
Btrfs: fix failure to persist compression property xattr deletion on fsync
2019-06-17 16:37:17 +02:00
xattr.h
btrfs: cleanup btrfs_setxattr_trans and drop transaction parameter
2019-04-29 19:02:44 +02:00
zlib.c
btrfs: use larger zlib buffer for s390 hardware compression
2020-01-31 10:30:40 -08:00
zstd.c
btrfs: compression: inline free_workspace
2019-11-18 12:46:59 +01:00