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SubjectRe: 2.6.8.1-mm3
Jesse Barnes <jbarnes@engr.sgi.com> wrote:
>
> I applied wli's per-cpu profiling patch, added some tweaks that he and I
> discussed on irc and things look pretty good. We can now profile all 512
> CPUs in the system w/o livelocking :)

OK..

> Here's the output part way through a kernbench run:

(This doesn't sound like the sort of workload which people would buy an
Altix for?)

> [root@ascender root]# time readprofile -m System.map-2.6.8.1-mm3 | sort -nr |
> head -20
> 62551761 total 9.6980
> 27173178 default_idle 70763.4844

> 27081955 ia64_pal_call_static 141051.8490
> 3175264 ia64_load_scratch_fpregs 49613.5000
> 3166434 ia64_save_scratch_fpregs 49475.5312

What do the above three mean?

> 1603765 ia64_spinlock_contention 16705.8854

That's 0.04% of total non-idle CPU time. This seems wrong.

> 135010 rcu_check_quiescent_state 351.5885
> 11457 del_timer_sync 22.3770
> 10003 clear_page_tables 7.6242
> 9948 memset 9.4205
> 7845 copy_page 30.6445
> 7652 __d_lookup 8.5402
> 7379 clear_page 46.1187
> 7177 zap_pte_range 3.7380
> 6044 __copy_user 2.5873
> 5168 file_move 23.0714
> 4611 xfs_ilock 9.0059
> 4230 atomic_dec_and_lock 16.5234
> 4035 finish_task_switch 14.0104
> 3938 file_kill 17.5804
>
> real 1m32.554s
> user 0m0.215s
> sys 1m32.375s
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