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Date: Thu, 28 Sep 2017 16:02:23 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Benjamin Coddington <bcodding@...hat.com>
Cc: Jeff Layton <jlayton@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>, lkp@...org
Subject: [lkp-robot] [fs/locks] 52306e882f: stress-ng.lockofd.ops_per_sec
-11% regression
Greeting,
FYI, we noticed a -11% regression of stress-ng.lockofd.ops_per_sec due to commit:
commit: 52306e882f77d3fd73f91435c41373d634acc5d2 ("fs/locks: Use allocation rather than the stack in fcntl_getlk()")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: stress-ng
on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory
with following parameters:
testtime: 1s
class: filesystem
cpufreq_governor: performance
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
testcase/path_params/tbox_group/run: stress-ng/1s-filesystem-performance/lkp-bdw-ep6
v4.13-rc1 52306e882f77d3fd73f91435c4
---------------- --------------------------
%stddev change %stddev
\ | \
1.219e+08 -11% 1.09e+08 stress-ng.lockofd.ops_per_sec
1.229e+08 -10% 1.103e+08 stress-ng.locka.ops_per_sec
1.233e+08 -10% 1.105e+08 stress-ng.locka.ops
1.223e+08 -11% 1.093e+08 stress-ng.lockofd.ops
1061237 10% 1168476 stress-ng.eventfd.ops
1061205 10% 1168414 stress-ng.eventfd.ops_per_sec
2913174 9% 3163165 stress-ng.time.voluntary_context_switches
89.90 -4% 86.58 stress-ng.time.user_time
26510 -6% 24822 stress-ng.io.ops
26489 -6% 24798 stress-ng.io.ops_per_sec
885499 ± 14% 18% 1042236 perf-stat.cpu-migrations
2.537e+08 10% 2.783e+08 perf-stat.node-store-misses
1067830 ± 4% 8% 1154877 ± 3% perf-stat.page-faults
5384755 ± 4% 7% 5747689 perf-stat.context-switches
32.28 7% 34.42 ± 3% perf-stat.node-store-miss-rate%
12245 ±110% -7e+03 5367 ± 29% latency_stats.avg.call_usermodehelper_exec.__request_module.get_fs_type.do_mount.SyS_mount.entry_SYSCALL_64_fastpath
311261 ±173% -3e+05 11702 ±100% latency_stats.avg.tty_release_struct.tty_release.__fput.____fput.task_work_run.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath
1472 ± 60% 4e+03 5144 ± 97% latency_stats.max.sync_inodes_sb.sync_inodes_one_sb.iterate_supers.sys_sync.entry_SYSCALL_64_fastpath
225 ± 39% 3e+03 3698 ±132% latency_stats.max.rpc_wait_bit_killable.__rpc_wait_for_completion_task.nfs4_do_close.[nfsv4].__nfs4_close.[nfsv4].nfs4_close_sync.[nfsv4].nfs4_close_context.[nfsv4].__put_nfs_open_context.nfs_file_clear_open_context.nfs_file_release.__fput.____fput.task_work_run
228 ± 34% 3e+03 3103 ±159% latency_stats.max.rpc_wait_bit_killable.__rpc_wait_for_completion_task.nfs4_run_open_task.[nfsv4].nfs4_do_open.[nfsv4].nfs4_atomic_open.[nfsv4].nfs4_file_open.[nfsv4].do_dentry_open.vfs_open.path_openat.do_filp_open.do_sys_open.SyS_open
270 ± 24% 3e+03 3110 ±162% latency_stats.max.io_schedule.wait_on_page_bit_common.__filemap_fdatawait_range.filemap_write_and_wait_range.nfs_file_fsync.vfs_fsync_range.vfs_fsync.nfs4_file_flush.[nfsv4].filp_close.do_dup2.SyS_dup2.entry_SYSCALL_64_fastpath
12245 ±110% -7e+03 5367 ± 29% latency_stats.max.call_usermodehelper_exec.__request_module.get_fs_type.do_mount.SyS_mount.entry_SYSCALL_64_fastpath
927506 ±173% -9e+05 11702 ±100% latency_stats.max.tty_release_struct.tty_release.__fput.____fput.task_work_run.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath
7892 ± 54% 3e+04 33793 ±131% latency_stats.sum.sync_inodes_sb.sync_inodes_one_sb.iterate_supers.sys_sync.entry_SYSCALL_64_fastpath
12030 ±109% 2e+04 33536 ±136% latency_stats.sum.autofs4_wait.autofs4_mount_wait.autofs4_d_manage.follow_managed.lookup_fast.path_openat.do_filp_open.do_sys_open.SyS_open.entry_SYSCALL_64_fastpath
14311 ± 15% 7e+03 21729 ±116% latency_stats.sum.call_rwsem_down_read_failed.page_lock_anon_vma_read.rmap_walk_anon.rmap_walk.try_to_unmap.migrate_pages.migrate_misplaced_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
8095 ± 22% 7e+03 15421 ± 79% latency_stats.sum.call_rwsem_down_read_failed.rmap_walk_anon.rmap_walk.remove_migration_ptes.migrate_pages.migrate_misplaced_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
495 ± 39% 7e+03 7470 ±131% latency_stats.sum.rpc_wait_bit_killable.__rpc_wait_for_completion_task.nfs4_do_close.[nfsv4].__nfs4_close.[nfsv4].nfs4_close_sync.[nfsv4].nfs4_close_context.[nfsv4].__put_nfs_open_context.nfs_file_clear_open_context.nfs_file_release.__fput.____fput.task_work_run
3449 ± 18% 7e+03 10001 ± 68% latency_stats.sum.io_schedule.wait_on_page_bit_common.__filemap_fdatawait_range.filemap_fdatawait_keep_errors.sync_inodes_sb.sync_inodes_one_sb.iterate_supers.sys_sync.entry_SYSCALL_64_fastpath
378 ±123% 6e+03 6438 ±109% latency_stats.sum.io_schedule.__lock_page.find_lock_entry.shmem_getpage_gfp.shmem_fault.__do_fault.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
386 ± 34% 3e+03 3242 ±153% latency_stats.sum.rpc_wait_bit_killable.__rpc_wait_for_completion_task.nfs4_run_open_task.[nfsv4].nfs4_do_open.[nfsv4].nfs4_atomic_open.[nfsv4].nfs4_file_open.[nfsv4].do_dentry_open.vfs_open.path_openat.do_filp_open.do_sys_open.SyS_open
413 ± 19% 3e+03 3256 ±156% latency_stats.sum.io_schedule.wait_on_page_bit_common.__filemap_fdatawait_range.filemap_write_and_wait_range.nfs_file_fsync.vfs_fsync_range.vfs_fsync.nfs4_file_flush.[nfsv4].filp_close.do_dup2.SyS_dup2.entry_SYSCALL_64_fastpath
2874 ±173% -3e+03 0 latency_stats.sum.call_rwsem_down_write_failed.do_unlinkat.SyS_unlink.entry_SYSCALL_64_fastpath
3683 ±172% -4e+03 5 ±100% latency_stats.sum.call_rwsem_down_read_failed.lookup_slow.walk_component.path_lookupat.filename_lookup.user_path_at_empty.SyS_chmod.entry_SYSCALL_64_fastpath
12245 ±110% -7e+03 5367 ± 29% latency_stats.sum.call_usermodehelper_exec.__request_module.get_fs_type.do_mount.SyS_mount.entry_SYSCALL_64_fastpath
7320 ±136% -7e+03 0 latency_stats.sum.call_rwsem_down_write_failed.do_truncate.do_sys_ftruncate.SyS_ftruncate.entry_SYSCALL_64_fastpath
52297 ±124% -3e+04 26320 ± 16% latency_stats.sum.call_rwsem_down_read_failed.lookup_slow.walk_component.link_path_walk.path_parentat.filename_parentat.do_unlinkat.SyS_unlink.entry_SYSCALL_64_fastpath
64452 ± 83% -3e+04 31383 ± 30% latency_stats.sum.call_rwsem_down_write_failed.do_rmdir.SyS_rmdir.entry_SYSCALL_64_fastpath
1867567 ±173% -2e+06 11702 ±100% latency_stats.sum.tty_release_struct.tty_release.__fput.____fput.task_work_run.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
Thanks,
Xiaolong
View attachment "config-4.13.0-rc1-12052-g52306e8" of type "text/plain" (161793 bytes)
View attachment "job-script" of type "text/plain" (6717 bytes)
View attachment "job.yaml" of type "text/plain" (4402 bytes)
View attachment "reproduce" of type "text/plain" (254 bytes)
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