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Date: Sat, 8 Aug 2009 14:29:23 +0200
From: Ingo Molnar <mingo@...e.hu>
To: mingo@...hat.com, hpa@...or.com, acme@...hat.com,
linux-kernel@...r.kernel.org, fweisbec@...il.com,
peterz@...radead.org, efault@....de, tglx@...utronix.de
Cc: linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf tools: callchain: Fix sum of
percentages to be 100% by displaying amount of ignored chains in
fractal mode
* tip-bot for Frederic Weisbecker <fweisbec@...il.com> wrote:
> Commit-ID: 84fce09c6b21ef675de079a724c13a205c89520b
> Gitweb: http://git.kernel.org/tip/84fce09c6b21ef675de079a724c13a205c89520b
> Author: Frederic Weisbecker <fweisbec@...il.com>
> AuthorDate: Sat, 8 Aug 2009 02:16:25 +0200
> Committer: Ingo Molnar <mingo@...e.hu>
> CommitDate: Sat, 8 Aug 2009 13:49:21 +0200
>
> perf tools: callchain: Fix sum of percentages to be 100% by displaying amount of ignored chains in fractal mode
>
> When we filter the callchains below a given percentage, we
> ignore them and the end result only shows entries that have an
> upper percentage than the filter threshold.
>
> It seems to users then that we have an imbalance in the
> percentage, as if the sum inside a profiled branch doesn't
> reach 100%.
>
> Since in the past there have been real perf report bugs that
> showed the same sypmtom, it would be nice to assure the user
> that the data is perfect and trustable and it all sums up to
> 100.00%.
>
> So fix this by displaying the remaining hits that have been
> filtered but without more detail than their amount in each
> branches. Example while filtering below 50%:
>
> 7.73% [k] delay_tsc
> |
> |--98.22%-- __const_udelay
> | |
> | |--86.37%-- ath5k_hw_register_timeout
> | | ath5k_hw_noise_floor_calibration
> | | ath5k_hw_reset
> | | ath5k_reset
> | | ath5k_config
> | | ieee80211_hw_config
> | | |
> | | |--88.53%-- ieee80211_scan_work
> | | | worker_thread
> | | | kthread
> | | | child_rip
> | | --11.47%-- [...]
> | --13.63%-- [...]
> --1.78%-- [...]
i dont seem to be able to get the bracketed numbers. I only get:
titan:~> perf record -f -g -a ./hackbench 10
titan:~> perf report -g fractal,10.0
# Samples: 26832
#
# Overhead Command Shared Object Symbol
# ........ .............. ........................ ......
#
8.69% hackbench [kernel] [k] copy_user_generic_string
6.84% hackbench [kernel] [k] unix_stream_recvmsg
6.07% hackbench [kernel] [k] sock_alloc_send_pskb
4.33% hackbench [kernel] [k] _spin_lock
3.77% hackbench [kernel] [k] __kmalloc_node_track_caller
3.74% hackbench [kernel] [k] __alloc_skb
|
|--80.00%-- sock_alloc_send_pskb
| sock_alloc_send_skb
| unix_stream_sendmsg
| __sock_sendmsg
| sock_aio_write
| do_sync_write
| vfs_write
| sys_write
| sysenter_dispatch
| 0xf7ffa430
| 0xffadeb0000000014
|
--20.00%-- sock_alloc_send_skb
unix_stream_sendmsg
__sock_sendmsg
sock_aio_write
do_sync_write
vfs_write
sys_write
sysenter_dispatch
0xf7ffa430
0xffadeb0000000014
3.53% hackbench [kernel] [k] ia32_sysenter_target
2.92% hackbench [vdso] [.] 0x000000f7ffa430
|
|--66.67%-- 0xf7ffa430
| 0xffadeb0000000014
|
--33.33%-- 0xf7ffa431
0xffadeb0000000014
2.56% hackbench [kernel] [k] virt_to_head_page
2.37% hackbench [kernel] [k] kmem_cache_alloc_node
2.33% hackbench [kernel] [k] _spin_lock_irqsave
|
|--78.57%-- remove_wait_queue
| poll_freewait
| do_sys_poll
| sys_poll
| sysenter_dispatch
| 0xf7ffa430
| 0x1ffadea3c
|
|--7.14%-- __up_read
| up_read
| do_page_fault
| page_fault
| 0xf7ffa430
| 0xa0df710000000a
|
|--7.14%-- unix_stream_sendmsg
| __sock_sendmsg
| sock_aio_write
| do_sync_write
| vfs_write
| sys_write
| sysenter_dispatch
| 0xf7ffa430
| 0xffadeb0000000014
|
--7.14%-- skb_queue_tail
unix_stream_sendmsg
__sock_sendmsg
sock_aio_write
do_sync_write
vfs_write
sys_write
sysenter_dispatch
0xf7ffa430
0xffadeb0000000014
I dont see the brackets anymore, nor does the 10% limit seem to have
been listened to for the 7.14% result above, right?
Ingo
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