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Message-ID: <20200615065823.GB57549@shbuild999.sh.intel.com>
Date: Mon, 15 Jun 2020 14:58:23 +0800
From: Feng Tang <feng.tang@...el.com>
To: Philip Li <philip.li@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jann Horn <jannh@...gle.com>, Christoph Hellwig <hch@....de>,
Oleg Nesterov <oleg@...hat.com>,
Kirill Shutemov <kirill@...temov.name>,
Jan Kara <jack@...e.cz>,
Andrea Arcangeli <aarcange@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [LKP] Re: [gup] 17839856fd: stress-ng.vm-splice.ops_per_sec
2158.6% improvement
Hi Linus,
On Fri, Jun 12, 2020 at 08:07:32AM +0800, Philip Li wrote:
> On Thu, Jun 11, 2020 at 01:24:09PM -0700, Linus Torvalds wrote:
> >
> > IOW, rather than the above "just run all fo the lkp scripts",
> > something like how to run the actual individual test would be good.
> >
> > IOW how do those yaml files translate into _actually_ running the
> > 'stress-ng' program?
> Thanks Linus for your feedback, we will improve this to provide
> more clear reproduce information.
>
> In the attachment, there's a reproduce script with content like below,
> which is another way to directly run the stress-ng. This helps to show
> which parameters we are using when having this report. Would you mind to
> have a look?
>
> for cpu_dir in /sys/devices/system/cpu/cpu[0-9]*
> do
> online_file="$cpu_dir"/online
> [ -f "$online_file" ] && [ "$(cat "$online_file")" -eq 0 ] && continue
>
> file="$cpu_dir"/cpufreq/scaling_governor
> [ -f "$file" ] && echo "performance" > "$file"
> done
>
> "stress-ng" "--timeout" "30" "--times" "--verify" "--metrics-brief" "--sequential" "96" "--class" "pipe" "--exclude" "spawn,exec,swap"
If you only want to run "vm-splice" case only, you can use "exclude"
option like:
stress-ng --timeout 20 --times --verify --metrics-brief --sequential NR_CPUS --class pipe --exclude="fifo,pipe,sendfile,splice,tee"
Also we've used 0day framework to capture some perf info, pasted below,
hope it could provide some hint, the biggest change is "__get_user_pages"
is almost gone in perf samples:
* perf profile compare
67.21 -67.2 0.00 pp.bt.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe.do_vmsplice
65.22 -65.2 0.00 pp.bt.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe
64.74 -64.7 0.00 pp.bt.follow_page_pte.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages
67.58 -54.0 13.60 pp.bt.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe.do_vmsplice.__do_sys_vmsplice
67.67 -51.8 15.83 pp.bt.iov_iter_get_pages.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64
67.86 -46.3 21.56 pp.bt.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
70.00 -40.7 29.30 pp.bt.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
37.33 -37.3 0.00 pp.bt.mark_page_accessed.follow_page_pte.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast
* decouple of __do_sys_vmsplice
- old commit(f359287765):
- 70.42% 0.06% stress-ng-vm-sp [kernel.kallsyms] [k] __do_sys_vmsplice
- 70.36% __do_sys_vmsplice
- 69.95% do_vmsplice.part.0
- 67.80% iter_to_pipe
- 67.61% iov_iter_get_pages
- 67.52% internal_get_user_pages_fast
- 67.15% get_user_pages_unlocked
- 65.17% __get_user_pages
- 64.68% follow_page_pte
- 37.36% mark_page_accessed
1.31% workingset_activation
26.77% try_grab_page
1.37% up_read
0.54% down_read
1.03% mutex_unlock
0.72% wakeup_pipe_readers
- new commit(17839856fd):
- 41.93% 1.67% stress-ng-vm-sp [kernel.kallsyms] [k] __do_sys_vmsplice
- 40.26% __do_sys_vmsplice
- 29.49% do_vmsplice.part.0
- 21.50% iter_to_pipe
- 15.71% iov_iter_get_pages
- 13.59% internal_get_user_pages_fast
- 11.52% gup_pgd_range
1.83% try_grab_compound_head
1.67% iov_iter_advance
1.22% add_to_pipe
- 3.46% mutex_lock
1.04% ___might_sleep
0.75% __might_sleep
1.42% wakeup_pipe_readers
1.14% mutex_unlock
- 9.01% import_iovec
- 7.83% rw_copy_check_uvector
- 5.24% _copy_from_user
- 2.14% __might_fault
1.07% ___might_sleep
0.56% __might_sleep
1.20% copy_user_generic_unrolled
0.84% copy_user_enhanced_fast_string
- 1.32% __check_object_size
0.53% check_stack_object
1.31% __fget_light
* detailed compare report
4.43 -99.2% 0.03 perf-stat.i.MPKI
3.163e+09 +1497.9% 5.055e+10 perf-stat.i.branch-instructions
1.16 -0.2 0.94 perf-stat.i.branch-miss-rate%
36601352 +1179.3% 4.682e+08 perf-stat.i.branch-misses
32.17 -21.8 10.33 perf-stat.i.cache-miss-rate%
23170333 -97.2% 653650 perf-stat.i.cache-misses
71808397 -92.2% 5636462 perf-stat.i.cache-references
1537 +0.5% 1546 perf-stat.i.context-switches
16.19 -94.0% 0.96 perf-stat.i.cpi
96108 -0.1% 95989 perf-stat.i.cpu-clock
2.636e+11 -4.8% 2.51e+11 perf-stat.i.cpu-cycles
126.06 +19.5% 150.69 perf-stat.i.cpu-migrations
11310 +5322.6% 613322 perf-stat.i.cycles-between-cache-misses
0.00 -0.0 0.00 perf-stat.i.dTLB-load-miss-rate%
47789 +162.6% 125478 perf-stat.i.dTLB-load-misses
4.223e+09 +1614.0% 7.237e+10 perf-stat.i.dTLB-loads
0.00 -0.0 0.00 perf-stat.i.dTLB-store-miss-rate%
17758 -38.2% 10983 perf-stat.i.dTLB-store-misses
2.541e+09 +1636.8% 4.414e+10 perf-stat.i.dTLB-stores
99.33 +0.6 99.89 perf-stat.i.iTLB-load-miss-rate%
23983228 +1653.0% 4.204e+08 perf-stat.i.iTLB-load-misses
83340 +192.8% 244057 perf-stat.i.iTLB-loads
1.622e+10 +1506.1% 2.605e+11 perf-stat.i.instructions
689.90 -10.0% 620.97 perf-stat.i.instructions-per-iTLB-miss
0.06 +1524.4% 1.04 perf-stat.i.ipc
2.76 -5.5% 2.61 perf-stat.i.metric.GHz
0.87 +67.8% 1.47 perf-stat.i.metric.K/sec
104.92 +1557.3% 1738 perf-stat.i.metric.M/sec
2973 +0.2% 2979 perf-stat.i.minor-faults
97.83 -12.3 85.57 perf-stat.i.node-load-miss-rate%
1777209 -94.8% 91899 perf-stat.i.node-load-misses
40064 -28.5% 28636 perf-stat.i.node-loads
98.94 -11.7 87.22 perf-stat.i.node-store-miss-rate%
1950431 -97.9% 40800 perf-stat.i.node-store-misses
14881 -17.0% 12357 perf-stat.i.node-stores
2973 +0.2% 2979 perf-stat.i.page-faults
96108 -0.1% 95989 perf-stat.i.task-clock
4.44 -99.5% 0.02 perf-stat.overall.MPKI
1.13 -0.2 0.93 perf-stat.overall.branch-miss-rate%
32.29 -20.7 11.60 perf-stat.overall.cache-miss-rate%
16.30 -94.1% 0.96 perf-stat.overall.cpi
11380 +3265.0% 382951 perf-stat.overall.cycles-between-cache-misses
0.00 -0.0 0.00 perf-stat.overall.dTLB-load-miss-rate%
0.00 -0.0 0.00 perf-stat.overall.dTLB-store-miss-rate%
99.68 +0.3 99.94 perf-stat.overall.iTLB-load-miss-rate%
673.00 -7.9% 619.63 perf-stat.overall.instructions-per-iTLB-miss
0.06 +1591.6% 1.04 perf-stat.overall.ipc
97.65 -21.6 76.08 perf-stat.overall.node-load-miss-rate%
99.29 -22.6 76.65 perf-stat.overall.node-store-miss-rate%
3.114e+09 +1502.8% 4.991e+10 perf-stat.ps.branch-instructions
35311356 +1209.5% 4.624e+08 perf-stat.ps.branch-misses
22873359 -97.2% 647182 perf-stat.ps.cache-misses
70844364 -92.1% 5580624 perf-stat.ps.cache-references
1488 +2.6% 1527 perf-stat.ps.context-switches
94719 +0.1% 94804 perf-stat.ps.cpu-clock
2.603e+11 -4.8% 2.478e+11 perf-stat.ps.cpu-cycles
116.79 +27.4% 148.85 perf-stat.ps.cpu-migrations
46047 +169.3% 124021 perf-stat.ps.dTLB-load-misses
4.163e+09 +1616.8% 7.147e+10 perf-stat.ps.dTLB-loads
17216 -36.8% 10874 perf-stat.ps.dTLB-store-misses
2.508e+09 +1637.9% 4.359e+10 perf-stat.ps.dTLB-stores
23732007 +1649.3% 4.152e+08 perf-stat.ps.iTLB-load-misses
76010 +217.5% 241345 perf-stat.ps.iTLB-loads
1.597e+10 +1510.6% 2.572e+11 perf-stat.ps.instructions
2873 +2.7% 2951 perf-stat.ps.minor-faults
1752026 -94.8% 90903 perf-stat.ps.node-load-misses
42165 -32.2% 28583 perf-stat.ps.node-loads
1926258 -97.9% 40352 perf-stat.ps.node-store-misses
13783 -10.8% 12289 perf-stat.ps.node-stores
2873 +2.7% 2951 perf-stat.ps.page-faults
94719 +0.1% 94804 perf-stat.ps.task-clock
1.283e+12 +1529.3% 2.091e+13 perf-stat.total.instructions
67.21 -67.2 0.00 pp.bt.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe.do_vmsplice
65.22 -65.2 0.00 pp.bt.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe
64.74 -64.7 0.00 pp.bt.follow_page_pte.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages
67.58 -54.0 13.60 pp.bt.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe.do_vmsplice.__do_sys_vmsplice
67.67 -51.8 15.83 pp.bt.iov_iter_get_pages.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64
67.86 -46.3 21.56 pp.bt.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
70.00 -40.7 29.30 pp.bt.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
37.33 -37.3 0.00 pp.bt.mark_page_accessed.follow_page_pte.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast
70.48 -28.4 42.10 pp.bt.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
26.74 -26.7 0.00 pp.bt.try_grab_page.follow_page_pte.__get_user_pages.get_user_pages_unlocked.internal_get_user_pages_fast
70.62 -25.9 44.71 pp.bt.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
70.67 -24.6 46.08 pp.bt.entry_SYSCALL_64_after_hwframe.vmsplice
24.98 -22.9 2.11 pp.bt.page_cache_pipe_buf_release.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice
26.15 -16.0 10.15 pp.bt.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice.do_syscall_64
71.03 -13.1 57.88 pp.bt.vmsplice
27.50 -8.9 18.57 pp.bt.splice_from_pipe.do_splice.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.37 -1.4 0.00 pp.bt.up_read.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe
1.31 -1.3 0.00 pp.bt.workingset_activation.mark_page_accessed.follow_page_pte.__get_user_pages.get_user_pages_unlocked
0.54 -0.5 0.00 pp.bt.down_read.get_user_pages_unlocked.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe
27.81 -0.3 27.46 pp.bt.do_splice.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe.splice
1.03 +0.1 1.16 pp.bt.mutex_unlock.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +0.5 0.52 pp.bt.generic_pipe_buf_confirm.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice
0.00 +0.5 0.54 pp.bt.fpregs_assert_state_consistent.do_syscall_64.entry_SYSCALL_64_after_hwframe.splice
0.00 +0.5 0.54 pp.bt.check_stack_object.__check_object_size.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice
0.00 +0.6 0.55 pp.bt.aa_file_perm.common_file_perm.security_file_permission.do_splice.__x64_sys_splice
0.00 +0.6 0.56 pp.bt.__might_sleep.__might_fault._copy_from_user.rw_copy_check_uvector.import_iovec
0.00 +0.6 0.61 pp.bt.__x64_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
0.00 +0.6 0.64 pp.bt.splice_write_null.do_splice.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +0.7 0.67 pp.bt.apparmor_file_permission.security_file_permission.do_splice.__x64_sys_splice.do_syscall_64
0.81 +0.7 1.50 pp.bt.wakeup_pipe_writers.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice
0.72 +0.7 1.44 pp.bt.wakeup_pipe_readers.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +0.7 0.73 pp.bt.__might_sleep.mutex_lock.splice_from_pipe.do_splice.__x64_sys_splice
0.00 +0.8 0.75 pp.bt.__might_sleep.mutex_lock.do_vmsplice.__do_sys_vmsplice.do_syscall_64
0.00 +0.8 0.80 pp.bt.pipe_to_null.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice
0.00 +0.8 0.85 pp.bt.copy_user_enhanced_fast_string._copy_from_user.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice
0.00 +0.9 0.95 pp.bt.rw_verify_area.do_splice.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +1.0 0.97 pp.bt.___might_sleep.__splice_from_pipe.splice_from_pipe.do_splice.__x64_sys_splice
0.00 +1.1 1.05 pp.bt.___might_sleep.mutex_lock.do_vmsplice.__do_sys_vmsplice.do_syscall_64
0.00 +1.1 1.08 pp.bt.___might_sleep.__might_fault._copy_from_user.rw_copy_check_uvector.import_iovec
0.00 +1.1 1.08 pp.bt.___might_sleep.mutex_lock.splice_from_pipe.do_splice.__x64_sys_splice
0.00 +1.1 1.11 pp.bt.mutex_unlock.splice_from_pipe.do_splice.__x64_sys_splice.do_syscall_64
0.00 +1.2 1.21 pp.bt.copy_user_generic_unrolled._copy_from_user.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice
0.00 +1.2 1.23 pp.bt.__check_object_size.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice.do_syscall_64
0.00 +1.2 1.23 pp.bt.add_to_pipe.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64
0.00 +1.3 1.33 pp.bt.__fget_light.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
0.00 +1.4 1.38 pp.bt.syscall_return_via_sysret.splice
0.00 +1.4 1.40 pp.bt.syscall_return_via_sysret.vmsplice
0.00 +1.7 1.69 pp.bt.iov_iter_advance.iter_to_pipe.do_vmsplice.__do_sys_vmsplice.do_syscall_64
0.00 +1.9 1.85 pp.bt.try_grab_compound_head.gup_pgd_range.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe
0.00 +2.1 2.11 pp.bt.__might_fault._copy_from_user.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice
0.00 +2.3 2.33 pp.bt.__fget_light.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe.splice
0.77 +2.6 3.37 pp.bt.mutex_lock.splice_from_pipe.do_splice.__x64_sys_splice.do_syscall_64
0.00 +3.1 3.07 pp.bt.common_file_perm.security_file_permission.do_splice.__x64_sys_splice.do_syscall_64
0.00 +3.3 3.33 pp.bt.mutex_lock.do_vmsplice.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
27.95 +3.8 31.74 pp.bt.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe.splice
0.00 +4.5 4.50 pp.bt.security_file_permission.do_splice.__x64_sys_splice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +5.2 5.17 pp.bt._copy_from_user.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice.do_syscall_64
28.02 +5.6 33.60 pp.bt.do_syscall_64.entry_SYSCALL_64_after_hwframe.splice
28.07 +6.9 34.94 pp.bt.entry_SYSCALL_64_after_hwframe.splice
0.00 +6.9 6.93 pp.bt.entry_SYSCALL_64.vmsplice
0.00 +7.0 7.05 pp.bt.entry_SYSCALL_64.splice
0.00 +7.7 7.68 pp.bt.rw_copy_check_uvector.import_iovec.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +9.1 9.13 pp.bt.import_iovec.__do_sys_vmsplice.do_syscall_64.entry_SYSCALL_64_after_hwframe.vmsplice
0.00 +11.5 11.48 pp.bt.gup_pgd_range.internal_get_user_pages_fast.iov_iter_get_pages.iter_to_pipe.do_vmsplice
28.44 +18.2 46.63 pp.bt.splice
67.21 -67.2 0.00 pp.child.get_user_pages_unlocked
65.24 -65.2 0.00 pp.child.__get_user_pages
64.75 -64.8 0.00 pp.child.follow_page_pte
67.59 -53.8 13.78 pp.child.internal_get_user_pages_fast
67.67 -51.7 15.94 pp.child.iov_iter_get_pages
67.87 -46.1 21.79 pp.child.iter_to_pipe
70.02 -40.2 29.85 pp.child.do_vmsplice
37.40 -37.4 0.00 pp.child.mark_page_accessed
70.49 -28.1 42.37 pp.child.__do_sys_vmsplice
26.80 -26.8 0.00 pp.child.try_grab_page
25.03 -22.9 2.11 pp.child.page_cache_pipe_buf_release
98.98 -20.5 78.53 pp.child.do_syscall_64
99.07 -17.8 81.22 pp.child.entry_SYSCALL_64_after_hwframe
26.17 -15.5 10.65 pp.child.__splice_from_pipe
71.12 -13.2 57.90 pp.child.vmsplice
27.51 -8.8 18.73 pp.child.splice_from_pipe
1.37 -1.4 0.00 pp.child.up_read
1.31 -1.3 0.00 pp.child.workingset_activation
0.54 -0.5 0.00 pp.child.down_read
0.40 -0.4 0.00 pp.child._raw_spin_lock
0.18 -0.2 0.00 pp.child.__libc_start_main
0.18 -0.2 0.00 pp.child.main
0.17 -0.2 0.00 pp.child.ksys_write
0.17 -0.2 0.00 pp.child.vfs_write
0.17 -0.2 0.00 pp.child.new_sync_write
0.16 -0.2 0.00 pp.child.cmd_record
0.16 -0.2 0.00 pp.child.perf_mmap__push
0.16 -0.2 0.00 pp.child.__GI___libc_write
0.16 -0.2 0.00 pp.child.generic_file_write_iter
0.16 -0.2 0.00 pp.child.__generic_file_write_iter
0.16 -0.2 0.00 pp.child.generic_perform_write
0.12 -0.1 0.00 pp.child.iov_iter_copy_from_user_atomic
0.12 -0.1 0.00 pp.child.copyin
0.11 -0.1 0.00 pp.child.find_extend_vma
0.11 -0.1 0.00 pp.child.ret_from_fork
0.10 -0.1 0.00 pp.child.kthread
0.10 -0.1 0.00 pp.child.follow_page_mask
0.09 -0.1 0.00 pp.child.follow_pmd_mask
0.06 -0.1 0.00 pp.child.page_fault
0.06 -0.1 0.00 pp.child.do_user_addr_fault
0.06 -0.1 0.00 pp.child.handle_mm_fault
0.06 -0.1 0.00 pp.child.__handle_mm_fault
0.05 -0.1 0.00 pp.child.worker_thread
0.05 -0.1 0.00 pp.child.process_one_work
0.05 -0.1 0.00 pp.child.execve
0.05 -0.1 0.00 pp.child.__x64_sys_execve
0.05 -0.1 0.00 pp.child.__do_execve_file
0.05 -0.1 0.00 pp.child.find_vma
0.05 -0.1 0.00 pp.child.memcpy_erms
0.08 +0.0 0.10 pp.child.task_tick_fair
0.10 +0.0 0.13 pp.child.scheduler_tick
27.82 +0.0 27.85 pp.child.do_splice
0.13 +0.0 0.18 pp.child.tick_sched_handle
0.13 +0.0 0.18 pp.child.update_process_times
0.00 +0.1 0.05 pp.child.perf_mux_hrtimer_handler
0.00 +0.1 0.09 pp.child.ktime_get_update_offsets_now
0.00 +0.1 0.10 pp.child.get_user_pages_fast
0.00 +0.1 0.10 pp.child.vmsplice@plt
0.00 +0.1 0.11 pp.child.vmsplice_type
0.15 +0.1 0.26 pp.child.tick_sched_timer
0.00 +0.1 0.12 pp.child.splice@plt
0.00 +0.1 0.13 pp.child.pud_huge
0.06 +0.1 0.21 pp.child.clockevents_program_event
0.19 +0.2 0.34 pp.child.__hrtimer_run_queues
0.56 +0.2 0.73 pp.child.__irqentry_text_start
0.00 +0.2 0.18 pp.child.kill_fasync
0.05 +0.2 0.25 pp.child.ktime_get
0.00 +0.3 0.26 pp.child.pmd_huge
0.00 +0.3 0.26 pp.child.__fdget
0.37 +0.3 0.69 pp.child.smp_apic_timer_interrupt
0.32 +0.3 0.65 pp.child.hrtimer_interrupt
0.00 +0.3 0.34 pp.child.kfree
0.00 +0.4 0.39 pp.child.splice_from_pipe_next
0.00 +0.4 0.41 pp.child.wait_for_space
0.00 +0.5 0.45 pp.child.pipe_lock
0.00 +0.5 0.46 pp.child.pipe_unlock
0.00 +0.6 0.56 pp.child.aa_file_perm
0.00 +0.6 0.57 pp.child.check_stack_object
0.00 +0.6 0.57 pp.child.get_pipe_info
0.00 +0.6 0.62 pp.child.__x64_sys_vmsplice
0.00 +0.7 0.68 pp.child.rcu_all_qs
0.81 +0.7 1.50 pp.child.wakeup_pipe_writers
0.00 +0.7 0.71 pp.child.apparmor_file_permission
0.72 +0.7 1.44 pp.child.wakeup_pipe_readers
0.00 +0.7 0.73 pp.child.splice_write_null
0.15 +0.8 0.93 pp.child.copy_user_enhanced_fast_string
0.00 +0.8 0.84 pp.child.generic_pipe_buf_confirm
0.00 +0.9 0.87 pp.child.pipe_to_null
0.00 +0.9 0.88 pp.child.__x86_indirect_thunk_rax
1.47 +0.9 2.36 pp.child.mutex_unlock
0.00 +1.0 0.99 pp.child.rw_verify_area
0.08 +1.0 1.13 pp.child.fpregs_assert_state_consistent
0.08 +1.2 1.27 pp.child._cond_resched
0.05 +1.2 1.24 pp.child.add_to_pipe
0.00 +1.4 1.38 pp.child.__check_object_size
0.06 +1.4 1.50 pp.child.copy_user_generic_unrolled
0.05 +1.7 1.71 pp.child.iov_iter_advance
0.00 +1.9 1.85 pp.child.try_grab_compound_head
0.09 +2.0 2.08 pp.child.__might_sleep
0.11 +2.1 2.21 pp.child.__might_fault
0.12 +3.0 3.17 pp.child.common_file_perm
0.13 +3.5 3.66 pp.child.__fget_light
0.32 +3.9 4.20 pp.child.___might_sleep
27.95 +3.9 31.85 pp.child.__x64_sys_splice
0.16 +4.4 4.59 pp.child.security_file_permission
0.23 +5.1 5.36 pp.child._copy_from_user
1.11 +5.9 7.04 pp.child.mutex_lock
0.30 +7.2 7.52 pp.child.syscall_return_via_sysret
0.30 +7.7 7.96 pp.child.rw_copy_check_uvector
0.35 +8.9 9.21 pp.child.import_iovec
0.36 +9.0 9.40 pp.child.entry_SYSCALL_64
0.29 +11.4 11.67 pp.child.gup_pgd_range
28.53 +18.2 46.70 pp.child.splice
35.94 -35.9 0.00 pp.self.mark_page_accessed
26.67 -26.7 0.00 pp.self.try_grab_page
24.93 -22.9 2.04 pp.self.page_cache_pipe_buf_release
1.37 -1.4 0.00 pp.self.up_read
1.31 -1.3 0.00 pp.self.workingset_activation
0.45 -0.5 0.00 pp.self.down_read
0.39 -0.4 0.00 pp.self._raw_spin_lock
0.17 -0.2 0.00 pp.self.follow_page_pte
0.14 -0.1 0.00 pp.self.__get_user_pages
0.09 -0.1 0.00 pp.self.follow_page_mask
0.08 -0.1 0.00 pp.self.follow_pmd_mask
0.06 -0.1 0.00 pp.self.get_user_pages_unlocked
0.06 -0.1 0.00 pp.self.find_extend_vma
0.05 -0.1 0.00 pp.self.memcpy_erms
0.00 +0.1 0.06 pp.self.get_user_pages_fast
0.00 +0.1 0.08 pp.self.pud_huge
0.00 +0.1 0.09 pp.self.ktime_get_update_offsets_now
0.00 +0.1 0.10 pp.self.vmsplice@plt
0.00 +0.1 0.11 pp.self.vmsplice_type
0.00 +0.1 0.12 pp.self.splice@plt
0.00 +0.2 0.17 pp.self.__fdget
0.00 +0.2 0.18 pp.self.kill_fasync
0.00 +0.2 0.20 pp.self.pmd_huge
0.00 +0.2 0.23 pp.self.ktime_get
0.00 +0.3 0.28 pp.self.pipe_lock
0.00 +0.3 0.28 pp.self.kfree
0.00 +0.3 0.29 pp.self.pipe_unlock
0.00 +0.3 0.33 pp.self.splice_from_pipe_next
0.00 +0.3 0.35 pp.self.wait_for_space
0.00 +0.4 0.38 pp.self.__x86_indirect_thunk_rax
0.00 +0.4 0.39 pp.self.get_pipe_info
0.00 +0.5 0.47 pp.self.check_stack_object
0.00 +0.5 0.50 pp.self.aa_file_perm
0.00 +0.5 0.51 pp.self.rcu_all_qs
0.00 +0.5 0.53 pp.self.__might_fault
0.00 +0.6 0.56 pp.self.__x64_sys_vmsplice
0.00 +0.6 0.59 pp.self._cond_resched
0.81 +0.7 1.47 pp.self.wakeup_pipe_writers
0.00 +0.7 0.66 pp.self.splice_write_null
0.00 +0.7 0.66 pp.self.apparmor_file_permission
0.71 +0.7 1.38 pp.self.wakeup_pipe_readers
0.00 +0.7 0.71 pp.self.security_file_permission
0.15 +0.7 0.87 pp.self.copy_user_enhanced_fast_string
1.47 +0.8 2.24 pp.self.mutex_unlock
0.00 +0.8 0.78 pp.self.__check_object_size
0.00 +0.8 0.78 pp.self.generic_pipe_buf_confirm
0.00 +0.8 0.79 pp.self._copy_from_user
0.00 +0.8 0.81 pp.self.pipe_to_null
0.00 +0.9 0.88 pp.self.rw_verify_area
0.08 +1.0 1.09 pp.self.fpregs_assert_state_consistent
0.05 +1.1 1.19 pp.self.add_to_pipe
0.00 +1.2 1.20 pp.self.import_iovec
0.00 +1.3 1.27 pp.self.do_vmsplice
0.06 +1.3 1.41 pp.self.copy_user_generic_unrolled
0.05 +1.3 1.40 pp.self.rw_copy_check_uvector
0.05 +1.5 1.54 pp.self.__x64_sys_splice
0.05 +1.6 1.63 pp.self.iov_iter_advance
0.06 +1.6 1.69 pp.self.__do_sys_vmsplice
0.08 +1.7 1.80 pp.self.__might_sleep
0.00 +1.8 1.80 pp.self.try_grab_compound_head
0.95 +1.8 2.79 pp.self.mutex_lock
0.08 +2.0 2.05 pp.self.iov_iter_get_pages
0.09 +2.0 2.11 pp.self.internal_get_user_pages_fast
0.09 +2.3 2.39 pp.self.do_syscall_64
0.10 +2.5 2.61 pp.self.common_file_perm
0.10 +2.6 2.73 pp.self.entry_SYSCALL_64_after_hwframe
0.09 +2.7 2.75 pp.self.do_splice
0.09 +2.8 2.88 pp.self.iter_to_pipe
0.12 +3.0 3.13 pp.self.splice
0.12 +3.0 3.15 pp.self.splice_from_pipe
0.12 +3.1 3.18 pp.self.vmsplice
0.13 +3.4 3.56 pp.self.__fget_light
0.14 +3.5 3.60 pp.self.__splice_from_pipe
0.31 +3.8 4.07 pp.self.___might_sleep
0.19 +4.6 4.76 pp.self.entry_SYSCALL_64
0.30 +7.1 7.44 pp.self.syscall_return_via_sysret
0.28 +9.2 9.47 pp.self.gup_pgd_range
Thanks,
Feng
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