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Date: Tue, 25 Jan 2011 10:46:29 +0800
From: Shaohua Li <shaohua.li@...el.com>
To: Nick Piggin <npiggin@...il.com>
Cc: "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Nick Piggin <npiggin@...nel.dk>,
"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: more dput lock contentions in 2.6.38-rc?
On Tue, Jan 25, 2011 at 10:09:48AM +0800, Nick Piggin wrote:
> On Tue, Jan 25, 2011 at 1:01 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> > On Tue, Jan 25, 2011 at 09:44:45AM +0800, Nick Piggin wrote:
> >> On Tue, Jan 25, 2011 at 12:34 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> >> > On Tue, 2011-01-25 at 09:26 +0800, Nick Piggin wrote:
> >> >> On Tue, Jan 25, 2011 at 12:11 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> >> >> > On Tue, 2011-01-25 at 09:04 +0800, Nick Piggin wrote:
> >> >> >> On Tue, Jan 25, 2011 at 11:35 AM, Shaohua Li <shaohua.li@...el.com> wrote:
> >> >> >> > Hi,
> >> >> >> > we are testing dbench benchmark and see big drop of 2.6.38-rc compared
> >> >> >> > to 2.6.37 in several machines with 2 sockets or 4 sockets. We have 12
> >> >> >> > disks mount to /mnt/stp/dbenchdata/sd*/ and dbench runs against data of
> >> >> >> > the disks. According to perf, we saw more lock contentions:
> >> >> >> > In 2.6.37: 13.00% dbench [kernel.kallsyms] [k] _raw_spin_lock
> >> >> >> > In 2.6.38-rc: 69.45% dbench [kernel.kallsyms] [k]_raw_spin_lock
> >> >> >> > - 69.45% dbench [kernel.kallsyms] [k] _raw_spin_lock
> >> >> >> > - _raw_spin_lock
> >> >> >> > - 48.41% dput
> >> >> >> > - 61.17% path_put
> >> >> >> > - 60.47% do_path_lookup
> >> >> >> > + 53.18% user_path_at
> >> >> >> > + 42.13% do_filp_open
> >> >> >> > + 4.69% user_path_parent
> >> >> >>
> >> >> >> What filesystems are mounted on the path?
> >> >> > ext3 or ext4
> >> >>
> >> >> ext3 or 4 along every step of the path? Are there
> >> >> any acls loaded, or security policy running?
> >> > all disks are formated with the same fs, just some machines use ext3 and
> >> > others ext4. no we don't have acl or security policy.
> >> >> It may be possible that they're all coming from
> >> >> /proc/ access.
> >> > I added trace in dput just after the lock taken. and most files are '/',
> >> > 'mnt', 'stp'. the percentage of 'proc' is small actually.
> >>
> >> Hm, OK well I could send you a patch to gather some statistics for
> >> why rcu-walk gets dropped. It'll have to wait until I get home, though.
> > Sure, I'm still at office tomorrow. I can test before that day, otherwise
> > maybe Tim can help.
>
> There _are_ a lot of dput contentions coming from d_path. Some of the
> dentries you're seeing in dput could be coming from path_put in
> d_path (mountpoints, eg. 'mnt').
>
> What does an actual snippet from perf with callgraphs look like?
here is another perf report
# Events: 198K cycles
#
# Overhead Command Shared Object Symbol
# ........ ............ .................. ..........................................
#
70.20% dbench [kernel.kallsyms] [k] _raw_spin_lock
|
--- _raw_spin_lock
|
|---1.79%-- dput
| |
| |---45.22%-- path_put
| | |
| | |--58.16%-- do_path_lookup
| | | |
| | | |--55.25%-- user_path_at
| | | | |
| | | | |--96.85%-- vfs_fstatat
| | | | | vfs_stat
| | | | | sys_newstat
| | | | | system_call_fastpath
| | | | | __GI___xstat64
| | | | | |
| | | | | --100.00%-- 0x1000
| | | | |
| | | | --3.15%-- sys_statfs
| | | | system_call_fastpath
| | | | __GI___statfs
| | | | |
| | | | |--80.01%-- _int_malloc
| | | | |
| | | | --19.99%-- 0x6a
| | | |
| | | |--40.19%-- do_filp_open
| | | | do_sys_open
| | | | sys_open
| | | | system_call_fastpath
| | | | __GI_open64
| | | | |
| | | | --100.00%-- __fopen_internal
| | | | |
| | | | |--80.02%-- 0x200000000
| | | | |
| | | | --19.98%-- 0x34c333c0ef
| | | |
| | | --4.56%-- user_path_parent
| | | |
| | | |--66.67%-- do_unlinkat
| | | | sys_unlink
| | | | system_call_fastpath
| | | | __unlink
| | | |
| | | --33.33%-- sys_renameat
| | | sys_rename
| | | system_call_fastpath
| | | __GI_rename
| | |
| | |--37.67%-- d_path
| | | seq_path
| | | show_vfsmnt
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI___libc_read
| | |
| | |--2.15%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | |--1.89%-- mounts_release
| | | fput
| | | filp_close
| | | sys_close
| | | system_call_fastpath
| | | __GI_close
| | --0.13%-- [...]
| |
| |--41.39%-- link_path_walk
| | |
| | |--96.97%-- do_path_lookup
| | | |
| | | |--51.11%-- user_path_at
| | | | |
| | | | |--94.58%-- vfs_fstatat
| | | | | vfs_stat
| | | | | sys_newstat
| | | | | system_call_fastpath
| | | | | __GI___xstat64
| | | | | |
| | | | | --100.00%-- 0x1000
| | | | |
| | | | |--3.62%-- sys_statfs
| | | | | system_call_fastpath
| | | | | __GI___statfs
| | | | | |
| | | | | |--50.32%-- _int_malloc
| | | | | |
| | | | | |--24.79%-- 0x1000
| | | | | |
| | | | | |--12.50%-- 0x4
| | | | | | 0x544345004b4f5f53
| | | | | |
| | | | | --12.39%-- 0x34c3571740
| | | | |
| | | | --1.80%-- do_utimes
| | | | sys_utime
| | | | system_call_fastpath
| | | | __GI_utime
| | | |
| | | |--44.11%-- do_filp_open
| | | | do_sys_open
| | | | sys_open
| | | | system_call_fastpath
| | | | __GI_open64
| | | |
| | | --4.78%-- user_path_parent
| | | |
| | | |--61.54%-- do_unlinkat
| | | | sys_unlink
| | | | system_call_fastpath
| | | | __unlink
| | | |
| | | --38.46%-- sys_renameat
| | | sys_rename
| | | system_call_fastpath
| | | __GI_rename
| | |
| | |--2.85%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | --0.18%-- [...]
| --0.22%-- [...]
|
|---22.62%-- path_get
| |
| |--61.51%-- nameidata_drop_rcu
| | link_path_walk
| | |
| | |--96.48%-- do_path_lookup
| | | |
| | | |--54.89%-- user_path_at
| | | | |
| | | | |--93.35%-- vfs_fstatat
| | | | | vfs_stat
| | | | | sys_newstat
| | | | | system_call_fastpath
| | | | | __GI___xstat64
| | | | | |
| | | | | --100.00%-- 0x1000
| | | | |
| | | | |--5.09%-- sys_statfs
| | | | | system_call_fastpath
| | | | | __GI___statfs
| | | | | |
| | | | | |--50.01%-- 0x1000
| | | | | |
| | | | | --49.99%-- 0x9
| | | | |
| | | | --1.57%-- do_utimes
| | | | sys_utime
| | | | system_call_fastpath
| | | | __GI_utime
| | | |
| | | |--40.17%-- do_filp_open
| | | | do_sys_open
| | | | sys_open
| | | | system_call_fastpath
| | | | __GI_open64
| | | | |
| | | | --100.00%-- __fopen_internal
| | | | |
| | | | |--66.67%-- 0x34c333c0ef
| | | | |
| | | | --33.33%-- 0x200000000
| | | |
| | | --4.94%-- user_path_parent
| | | |
| | | |--73.91%-- do_unlinkat
| | | | sys_unlink
| | | | system_call_fastpath
| | | | __unlink
| | | |
| | | --26.09%-- sys_renameat
| | | sys_rename
| | | system_call_fastpath
| | | __GI_rename
| | |
| | --3.52%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--37.35%-- d_path
| | seq_path
| | show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| --1.15%-- get_task_root
| mounts_open_common
| mounts_open
| __dentry_open
| nameidata_to_filp
| finish_open
| do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
| |
| --100.00%-- __fopen_internal
| |
| |--50.01%-- 0x34c333c0ef
| |
| --49.99%-- 0x200000000
|
|--19.30%-- nameidata_drop_rcu
| link_path_walk
| |
| |--96.22%-- do_path_lookup
| | |
| | |--54.40%-- user_path_at
| | | |
| | | |--90.61%-- vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | | |
| | | | --100.00%-- 0x1000
| | | |
| | | |--7.22%-- sys_statfs
| | | | system_call_fastpath
| | | | __GI___statfs
| | | | |
| | | | |--60.00%-- _int_malloc
| | | | |
| | | | |--20.02%-- 0x1000
| | | | |
| | | | --19.98%-- 0x34c3571740
| | | |
| | | --2.17%-- do_utimes
| | | sys_utime
| | | system_call_fastpath
| | | __GI_utime
| | |
| | |--40.88%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | | |
| | | --100.00%-- __fopen_internal
| | | |
| | | |--64.00%-- 0x200000000
| | | |
| | | --36.00%-- 0x34c333c0ef
| | |
| | --4.71%-- user_path_parent
| | |
| | |--79.16%-- do_unlinkat
| | | sys_unlink
| | | system_call_fastpath
| | | __unlink
| | |
| | --20.84%-- sys_renameat
| | sys_rename
| | system_call_fastpath
| | __GI_rename
| |
| --3.78%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
|--0.95%-- __d_lookup
| do_lookup
| link_path_walk
| |
| |--88.46%-- do_path_lookup
| | |
| | |--52.16%-- user_path_at
| | | |
| | | |--91.67%-- vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | --8.33%-- sys_statfs
| | | system_call_fastpath
| | | __GI___statfs
| | |
| | --47.84%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| --11.54%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
|--0.51%-- d_path
| seq_path
| show_vfsmnt
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI___libc_read
--1.17%-- [...]
2.26% dbench [kernel.kallsyms] [k] copy_user_generic_string
|
--- copy_user_generic_string
|
|--67.84%-- generic_file_aio_read
| do_sync_read
| vfs_read
| |
| |--98.11%-- sys_pread64
| | system_call_fastpath
| | __libc_pread
| |
| --1.89%-- sys_read
| system_call_fastpath
| __GI___libc_read
|
|--28.32%-- generic_file_buffered_write
| __generic_file_aio_write
| generic_file_aio_write
| do_sync_write
| vfs_write
| sys_pwrite64
| system_call_fastpath
| __GI___pwrite64
|
|--2.56%-- call_filldir
| ext3_readdir
| vfs_readdir
| sys_getdents
| system_call_fastpath
| __getdents64
|
--1.28%-- vfs_read
sys_read
system_call_fastpath
__GI___libc_read
1.54% dbench [kernel.kallsyms] [k] read_hpet
|
--- read_hpet
ktime_get
|
|--47.29%-- tick_sched_timer
| __run_hrtimer
| hrtimer_interrupt
| smp_apic_timer_interrupt
| apic_timer_interrupt
| |
| |--34.29%-- dput
| | |
| | |--50.00%-- path_put
| | | |
| | | |--50.00%-- do_path_lookup
| | | | do_filp_open
| | | | do_sys_open
| | | | sys_open
| | | | system_call_fastpath
| | | | __GI_open64
| | | |
| | | |--33.33%-- d_path
| | | | seq_path
| | | | show_vfsmnt
| | | | seq_read
| | | | vfs_read
| | | | sys_read
| | | | system_call_fastpath
| | | | __GI___libc_read
| | | |
| | | --16.67%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --50.00%-- link_path_walk
| | do_path_lookup
| | |
| | |--50.00%-- user_path_at
| | | vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | |
| | |--33.34%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --16.66%-- user_path_parent
| | do_unlinkat
| | sys_unlink
| | system_call_fastpath
| | __unlink
| |
| |--22.86%-- path_get
| | |
| | |--62.49%-- d_path
| | | seq_path
| | | show_vfsmnt
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI___libc_read
| | |
| | --37.51%-- nameidata_drop_rcu
| | link_path_walk
| | do_path_lookup
| | |
| | |--66.66%-- user_path_at
| | | vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | | |
| | | --100.00%-- 0x1000
| | |
| | --33.34%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--11.42%-- nameidata_drop_rcu
| | link_path_walk
| | do_path_lookup
| | |
| | |--50.00%-- user_path_at
| | | |
| | | |--50.01%-- sys_statfs
| | | | system_call_fastpath
| | | | __GI___statfs
| | | | _int_malloc
| | | |
| | | --49.99%-- vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | |
| | |--25.00%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --24.99%-- user_path_parent
| | sys_renameat
| | sys_rename
| | system_call_fastpath
| | __GI_rename
| |
| |--5.72%-- link_path_walk
| | do_path_lookup
| | |
| | |--50.04%-- user_path_at
| | | vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | |
| | --49.96%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--2.86%-- show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| |--2.86%-- journal_get_write_access
| | __ext3_journal_get_write_access
| | ext3_reserve_inode_write
| | ext3_orphan_del
| | ext3_evict_inode
| | evict
| | iput
| | do_unlinkat
| | sys_unlink
| | system_call_fastpath
| | __unlink
| |
| |--2.86%-- follow_managed
| | do_lookup
| | link_path_walk
| | do_path_lookup
| | do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--2.86%-- m_start
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| |--2.86%-- malloc_consolidate
| |
| |--2.86%-- ext3fs_dirhash
| | htree_dirblock_to_tree
| | ext3_htree_fill_tree
| | ext3_readdir
| | vfs_readdir
| | sys_getdents
| | system_call_fastpath
| | __getdents64
| |
| |--2.86%-- ext3_write_begin
| | generic_file_buffered_write
| | __generic_file_aio_write
| | generic_file_aio_write
| | do_sync_write
| | vfs_write
| | sys_pwrite64
| | system_call_fastpath
| | __GI___pwrite64
| |
| |--2.86%-- handle_pte_fault
| | handle_mm_fault
| | do_page_fault
| | page_fault
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| --2.85%-- __strlen_sse2
|
|--32.43%-- sched_clock_tick
| scheduler_tick
| update_process_times
| tick_sched_timer
| __run_hrtimer
| hrtimer_interrupt
| smp_apic_timer_interrupt
| apic_timer_interrupt
| |
| |--37.51%-- path_get
| | |
| | |--88.89%-- nameidata_drop_rcu
| | | link_path_walk
| | | do_path_lookup
| | | |
| | | |--62.49%-- user_path_at
| | | | vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | --37.51%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --11.11%-- d_path
| | seq_path
| | show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| |--29.16%-- dput
| | |
| | |--57.16%-- path_put
| | | |
| | | |--50.01%-- do_path_lookup
| | | | user_path_at
| | | | vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | --49.99%-- d_path
| | | seq_path
| | | show_vfsmnt
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI___libc_read
| | |
| | --42.84%-- link_path_walk
| | do_path_lookup
| | |
| | |--66.65%-- user_path_at
| | | vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | |
| | --33.35%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--12.49%-- nameidata_drop_rcu
| | link_path_walk
| | |
| | |--66.65%-- do_path_lookup
| | | do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --33.35%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--4.17%-- journal_get_write_access
| | __ext3_journal_get_write_access
| | ext3_get_blocks_handle
| | ext3_get_block
| | __block_write_begin
| | ext3_write_begin
| | generic_file_buffered_write
| | __generic_file_aio_write
| | generic_file_aio_write
| | do_sync_write
| | vfs_write
| | sys_pwrite64
| | system_call_fastpath
| | __GI___pwrite64
| |
| |--4.17%-- path_put
| | do_path_lookup
| | do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--4.17%-- htree_dirblock_to_tree
| | ext3_htree_fill_tree
| | ext3_readdir
| | vfs_readdir
| | sys_getdents
| | system_call_fastpath
| | __getdents64
| |
| |--4.17%-- link_path_walk
| | do_path_lookup
| | do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| --4.16%-- _int_free
|
|--10.81%-- hrtimer_interrupt
| smp_apic_timer_interrupt
| apic_timer_interrupt
| |
| |--50.00%-- dput
| | path_put
| | do_path_lookup
| | |
| | |--75.00%-- user_path_at
| | | |
| | | |--66.67%-- vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | --33.33%-- sys_statfs
| | | system_call_fastpath
| | | __GI___statfs
| | |
| | --25.00%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--12.51%-- nameidata_drop_rcu
| | link_path_walk
| | do_path_lookup
| | do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| |--12.50%-- path_get
| | d_path
| | seq_path
| | show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| |--12.50%-- d_path
| | seq_path
| | show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| --12.50%-- getmntent_r
|
--9.46%-- tick_dev_program_event
tick_program_event
hrtimer_interrupt
smp_apic_timer_interrupt
apic_timer_interrupt
|
|--71.41%-- dput
| |
| |--59.99%-- link_path_walk
| | do_path_lookup
| | |
| | |--66.65%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --33.35%-- user_path_at
| | vfs_fstatat
| | vfs_stat
| | sys_newstat
| | system_call_fastpath
| | __GI___xstat64
| |
| --40.01%-- path_put
| |
| |--50.02%-- do_path_lookup
| | do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| --49.98%-- d_path
| seq_path
| show_vfsmnt
| seq_read
| vfs_read
| sys_read
| system_call_fastpath
| __GI___libc_read
|
|--14.30%-- find_lock_page
| grab_cache_page_write_begin
| ext3_write_begin
| generic_file_buffered_write
| __generic_file_aio_write
| generic_file_aio_write
| do_sync_write
| vfs_write
| sys_pwrite64
| system_call_fastpath
| __GI___pwrite64
|
--14.30%-- path_get
d_path
seq_path
show_vfsmnt
seq_read
vfs_read
sys_read
system_call_fastpath
__GI___libc_read
1.46% dbench [kernel.kallsyms] [k] dput
|
--- dput
|
|--52.83%-- path_put
| |
| |--57.98%-- do_path_lookup
| | |
| | |--50.17%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | |--40.77%-- user_path_at
| | | |
| | | |--77.78%-- vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | | |
| | | | --100.00%-- 0x1000
| | | |
| | | --22.22%-- sys_statfs
| | | system_call_fastpath
| | | __GI___statfs
| | | |
| | | --100.00%-- 0x340000006b
| | |
| | --9.06%-- user_path_parent
| | do_unlinkat
| | sys_unlink
| | system_call_fastpath
| | __unlink
| |
| |--39.39%-- d_path
| | seq_path
| | show_vfsmnt
| | seq_read
| | vfs_read
| | sys_read
| | system_call_fastpath
| | __GI___libc_read
| |
| --2.63%-- mounts_release
| fput
| filp_close
| sys_close
| system_call_fastpath
| __GI_close
|
|--44.40%-- link_path_walk
| |
| |--93.75%-- do_path_lookup
| | |
| | |--56.66%-- user_path_at
| | | |
| | | |--88.24%-- vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | --11.76%-- sys_statfs
| | | system_call_fastpath
| | | __GI___statfs
| | | |
| | | --100.00%-- _int_malloc
| | |
| | |--40.00%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --3.33%-- user_path_parent
| | do_unlinkat
| | sys_unlink
| | system_call_fastpath
| | __unlink
| |
| --6.25%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
--2.78%-- follow_managed
do_lookup
link_path_walk
do_path_lookup
|
|--50.00%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
--50.00%-- user_path_at
vfs_fstatat
vfs_stat
sys_newstat
system_call_fastpath
__GI___xstat64
0.77% swapper [kernel.kallsyms] [k] poll_idle
|
--- poll_idle
cpu_idle
|
|--4.82%-- start_secondary
|
--3.90%-- rest_init
start_kernel
x86_64_start_reservations
x86_64_start_kernel
0.74% dbench [kernel.kallsyms] [k] link_path_walk
|
--- link_path_walk
|
|--87.50%-- do_path_lookup
| |
| |--52.37%-- user_path_at
| | vfs_fstatat
| | vfs_stat
| | sys_newstat
| | system_call_fastpath
| | __GI___xstat64
| |
| |--38.10%-- do_filp_open
| | do_sys_open
| | sys_open
| | system_call_fastpath
| | __GI_open64
| |
| --9.52%-- user_path_parent
| do_unlinkat
| sys_unlink
| system_call_fastpath
| __unlink
|
|--8.34%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
--4.17%-- user_path_at
vfs_fstatat
vfs_stat
sys_newstat
system_call_fastpath
__GI___xstat64
0.61% dbench libc-2.11.so [.] __strchr_sse42
|
--- __strchr_sse42
0x608500
|
|--11.99%-- 0x524f464e495f4854
|
|--8.00%-- 0x353300004b4f5f53
|
|--8.00%-- 0x746e65696c632f73
|
|--8.00%-- 0x5443454a424f5f53
|
|--8.00%-- 0x65696c632f222058
|
|--4.01%-- 0x647e00004b4f5f53
|
|--4.00%-- 0x4355535f4f4e5f53
|
|--4.00%-- 0x4b4f00004b4f5f53
|
|--4.00%-- 0x4f4e00004b4f5f53
|
|--4.00%-- 0x3120302035303130
|
|--4.00%-- 0x3335353620363335
|
|--4.00%-- 0x535f544e20343132
|
|--4.00%-- 0x3535362032373031
|
|--4.00%-- 0x4d5500004b4f5f53
|
|--4.00%-- 0x4154535f544e2036
|
|--4.00%-- 0x4f5f535554415453
|
|--4.00%-- 0x5f5355544154535f
|
|--4.00%-- 0x2036393034203032
|
--4.00%-- 0x535f544e20363930
0.59% dbench [kernel.kallsyms] [k] mntput_no_expire
|
--- mntput_no_expire
|
|--97.30%-- mntput
| |
| |--88.89%-- path_put
| | |
| | |--49.99%-- do_path_lookup
| | | |
| | | |--62.50%-- user_path_at
| | | | vfs_fstatat
| | | | vfs_stat
| | | | sys_newstat
| | | | system_call_fastpath
| | | | __GI___xstat64
| | | |
| | | |--31.25%-- do_filp_open
| | | | do_sys_open
| | | | sys_open
| | | | system_call_fastpath
| | | | __GI_open64
| | | |
| | | --6.25%-- user_path_parent
| | | do_unlinkat
| | | sys_unlink
| | | system_call_fastpath
| | | __unlink
| | |
| | |--40.63%-- d_path
| | | seq_path
| | | show_vfsmnt
| | | seq_read
| | | vfs_read
| | | sys_read
| | | system_call_fastpath
| | | __GI___libc_read
| | |
| | |--3.13%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | |--3.13%-- mounts_release
| | | fput
| | | filp_close
| | | sys_close
| | | system_call_fastpath
| | | __GI_close
| | |
| | --3.13%-- vfs_fstatat
| | vfs_stat
| | sys_newstat
| | system_call_fastpath
| | __GI___xstat64
| |
| |--5.56%-- link_path_walk
| | do_path_lookup
| | |
| | |--50.02%-- user_path_parent
| | | do_unlinkat
| | | sys_unlink
| | | system_call_fastpath
| | | __unlink
| | |
| | --49.98%-- user_path_at
| | vfs_fstatat
| | vfs_stat
| | sys_newstat
| | system_call_fastpath
| | __GI___xstat64
| |
| --5.55%-- fput
| filp_close
| sys_close
| system_call_fastpath
| __GI_close
|
--2.70%-- path_put
vfs_fstatat
vfs_stat
sys_newstat
system_call_fastpath
__GI___xstat64
0.53% dbench [kernel.kallsyms] [k] __d_lookup
|
--- __d_lookup
|
|--93.55%-- do_lookup
| link_path_walk
| |
| |--96.55%-- do_path_lookup
| | |
| | |--46.43%-- user_path_at
| | | vfs_fstatat
| | | vfs_stat
| | | sys_newstat
| | | system_call_fastpath
| | | __GI___xstat64
| | |
| | |--39.28%-- do_filp_open
| | | do_sys_open
| | | sys_open
| | | system_call_fastpath
| | | __GI_open64
| | |
| | --14.29%-- user_path_parent
| | |
| | |--74.99%-- do_unlinkat
| | | sys_unlink
| | | system_call_fastpath
| | | __unlink
| | |
| | --25.01%-- sys_renameat
| | sys_rename
| | system_call_fastpath
| | __GI_rename
| |
| --3.45%-- do_filp_open
| do_sys_open
| sys_open
| system_call_fastpath
| __GI_open64
|
--6.45%-- link_path_walk
do_path_lookup
do_filp_open
do_sys_open
sys_open
system_call_fastpath
__GI_open64
--
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