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Under heavy workloads or during background GC/fallocate operations,
nat_tree_lock can experience high lock contention between background
readers (e.g. f2fs_get_node_info() in gc_data_segment) and writers
(e.g. flush_nat_entries, set_node_addr, shrinker).
[375067.327986][T13777] schedule+0x4c/0x114
[375067.327997][T13777] f2fs_get_node_info+0x438/0x5c4
[375067.328002][T13777] f2fs_get_inode_page+0x1e0/0x3f0
[375067.328013][T13777] f2fs_iget+0x88/0x1180
[375067.328024][T13777] f2fs_lookup+0x168/0x3a8
[375067.328035][T13777] path_openat+0xa28/0x1b04
[375067.328046][T13777] do_filp_open+0xac/0x130
[375067.328056][T13777] do_sys_openat2+0x140/0x21c
[375067.328066][T13777] __arm64_sys_openat+0x70/0x9c
[375067.330299][T13777] schedule+0x4c/0x114
[375067.330310][T13777] schedule_preempt_disabled+0x24/0x40
[375067.330321][T13777] rwsem_down_write_slowpath+0x3b4/0x9d0
[375067.330332][T13777] down_write+0x98/0x170
[375067.330343][T13777] set_node_addr+0x74/0x4b4
[375067.330354][T13777] f2fs_new_node_page+0xb0/0x280
[375067.330444][T13777] f2fs_new_inode_page+0x3c/0x64
[375067.330455][T13777] f2fs_init_inode_metadata+0x4c/0x47c
[375067.330461][T13777] f2fs_add_regular_entry+0x258/0x5b8
[375067.330471][T13777] f2fs_add_dentry+0x100/0x158
[375067.330476][T13777] f2fs_do_add_link+0x84/0x140
[375067.330487][T13777] f2fs_create+0xec/0x250
[375067.331759][T13777] schedule+0x4c/0x114
[375067.331770][T13777] f2fs_down_read+0x9c/0xc4
[375067.331781][T13777] f2fs_need_inode_block_update+0x20/0x10c
[375067.331792][T13777] f2fs_do_sync_file+0x478/0x830
[375067.331802][T13777] f2fs_sync_file+0x2c/0x40
This patch converts nat_tree_lock to use the f2fs_{down,up}_{read,write}_trace
infrastructure.
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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| .. | ||
| ABI | ||
| accel | ||
| accounting | ||
| admin-guide | ||
| arch | ||
| block | ||
| bpf | ||
| cdrom | ||
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| mm | ||
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| translations | ||
| usb | ||
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| virt | ||
| w1 | ||
| watchdog | ||
| wmi | ||
| .gitignore | ||
| .renames.txt | ||
| atomic_bitops.txt | ||
| atomic_t.txt | ||
| Changes | ||
| CodingStyle | ||
| conf.py | ||
| docutils.conf | ||
| index.rst | ||
| Kconfig | ||
| Makefile | ||
| memory-barriers.txt | ||
| SubmittingPatches | ||
| subsystem-apis.rst | ||