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Message-ID: <bug-217965-13602-Fz0nJTVkVf@https.bugzilla.kernel.org/>
Date: Thu, 16 Nov 2023 04:05:00 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd
https://bugzilla.kernel.org/show_bug.cgi?id=217965
--- Comment #28 from Eyal Lebedinsky (bugzilla@...l.emu.id.au) ---
$ sudo perf record -p 1531839 -g sleep 60
[ perf record: Woken up 191 times to write data ]
[ perf record: Captured and wrote 47.856 MB perf.data (238391 samples) ]
$ sudo perf report --no-children --stdio -i perf.data
# To display the perf.data header info, please use --header/--header-only
options.
#
#
# Total Lost Samples: 0
#
# Samples: 238K of event 'cycles:P'
# Event count (approx.): 262920477580
#
# Overhead Command Shared Object Symbol
# ........ ............... .................
..........................................
#
58.48% kworker/u16:5+f [kernel.kallsyms] [k] ext4_mb_good_group
|
|--56.07%--ext4_mb_good_group
| |
| --55.85%--ext4_mb_find_good_group_avg_frag_lists
| ext4_mb_regular_allocator
| ext4_mb_new_blocks
| ext4_ext_map_blocks
| ext4_map_blocks
| ext4_do_writepages
| ext4_writepages
| do_writepages
| __writeback_single_inode
| writeback_sb_inodes
| __writeback_inodes_wb
| wb_writeback
| wb_workfn
| process_one_work
| worker_thread
| kthread
| ret_from_fork
| ret_from_fork_asm
|
--2.16%--ext4_get_group_info
ext4_mb_good_group
|
--2.16%--ext4_mb_find_good_group_avg_frag_lists
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
15.69% kworker/u16:5+f [kernel.kallsyms] [k] ext4_get_group_info
|
--15.10%--ext4_get_group_info
|
--15.05%--ext4_mb_good_group
|
--15.01%--ext4_mb_find_good_group_avg_frag_lists
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
9.51% kworker/u16:5+f [kernel.kallsyms] [k]
ext4_mb_find_good_group_avg_frag_lists
|
--9.26%--ext4_mb_find_good_group_avg_frag_lists
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
6.63% kworker/u16:5+f [kernel.kallsyms] [k] __rcu_read_unlock
|
|--4.56%--__rcu_read_unlock
| |
| --4.54%--ext4_get_group_info
| |
| --4.53%--ext4_mb_good_group
| |
|
--4.51%--ext4_mb_find_good_group_avg_frag_lists
|
ext4_mb_regular_allocator
| ext4_mb_new_blocks
| ext4_ext_map_blocks
| ext4_map_blocks
| ext4_do_writepages
| ext4_writepages
| do_writepages
|
__writeback_single_inode
| writeback_sb_inodes
| __writeback_inodes_wb
| wb_writeback
| wb_workfn
| process_one_work
| worker_thread
| kthread
| ret_from_fork
| ret_from_fork_asm
|
--2.08%--ext4_get_group_info
ext4_mb_good_group
|
--2.07%--ext4_mb_find_good_group_avg_frag_lists
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
4.32% kworker/u16:5+f [kernel.kallsyms] [k] __rcu_read_lock
|
--4.30%--__rcu_read_lock
|
--4.29%--ext4_get_group_info
|
--4.27%--ext4_mb_good_group
|
--4.26%--ext4_mb_find_good_group_avg_frag_lists
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
1.98% kworker/u16:5+f [kernel.kallsyms] [k] ext4_mb_scan_aligned
|
--1.98%--ext4_mb_scan_aligned
ext4_mb_regular_allocator
ext4_mb_new_blocks
ext4_ext_map_blocks
ext4_map_blocks
ext4_do_writepages
ext4_writepages
do_writepages
__writeback_single_inode
writeback_sb_inodes
__writeback_inodes_wb
wb_writeback
wb_workfn
process_one_work
worker_thread
kthread
ret_from_fork
ret_from_fork_asm
0.50% kworker/u16:5+f [kernel.kallsyms] [k] mb_find_order_for_block
0.44% kworker/u16:5+f [kernel.kallsyms] [k] ext4_mb_load_buddy_gfp
0.38% kworker/u16:5+f [kernel.kallsyms] [k] xas_descend
0.33% kworker/u16:5+f [kernel.kallsyms] [k] ext4_mb_regular_allocator
0.30% kworker/u16:5+f [kernel.kallsyms] [k] filemap_get_entry
0.24% kworker/u16:5+f [kernel.kallsyms] [k] xas_load
0.18% kworker/u16:5+f [kernel.kallsyms] [k] ext4_mb_unload_buddy
0.16% kworker/u16:5+f [kernel.kallsyms] [k] mb_find_extent
0.15% kworker/u16:5+f [kernel.kallsyms] [k] _raw_spin_trylock
0.14% kworker/u16:5+f [kernel.kallsyms] [k] _raw_read_unlock
0.10% kworker/u16:5+f [kernel.kallsyms] [k] _raw_read_lock
0.08% kworker/u16:5+f [kernel.kallsyms] [k] __filemap_get_folio
0.07% kworker/u16:5+f [kernel.kallsyms] [k] mb_find_buddy
0.05% kworker/u16:5+f [kernel.kallsyms] [k] xas_start
0.03% kworker/u16:5+f [kernel.kallsyms] [k] pagecache_get_page
0.03% kworker/u16:5+f [kernel.kallsyms] [k] _raw_spin_unlock
0.02% kworker/u16:5+f [kernel.kallsyms] [k]
perf_adjust_freq_unthr_context
0.02% kworker/u16:5+f [kernel.kallsyms] [k] folio_mark_accessed
0.02% kworker/u16:5+f [kernel.kallsyms] [k] folio_test_hugetlb
0.01% kworker/u16:5+f [kernel.kallsyms] [k] native_write_msr
0.01% kworker/u16:5+f [kernel.kallsyms] [k] _raw_spin_lock
0.01% kworker/u16:5+f [kernel.kallsyms] [k] __cond_resched
0.01% kworker/u16:5+f [kernel.kallsyms] [k] timekeeping_advance
0.01% kworker/u16:5+f [kernel.kallsyms] [k] native_irq_return_iret
0.00% kworker/u16:5+f [kernel.kallsyms] [k] gen8_irq_handler
--
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