On Mon, Mar 24, 2003 at 09:09:00PM -0800, Bryan Rittmeyer wrote:
> I'm going to try the hybrid approach and will post new patches soon.
done. patches are -v0002 at http://bryanr.org/linux/oprofile/
seems to be working pretty well, definitely _way_ more stable than
the patches that mix perfmon+decrementer... biggest kernel cycle
wasters during an imac ping -f run over ssh:
c0031344 20524 1.02949 kmalloc
c00d4ab4 22232 1.11516 netif_rx
c0074b98 24220 1.21488 n_tty_receive_buf
c00332e0 25583 1.28325 __free_pages_ok
c008ce68 28961 1.45269 gem_start_xmit
c00223a0 31661 1.58812 sys_rt_sigprocmask
c00eb92c 35584 1.7849 tcp_sendmsg
c003be24 38461 1.92921 fput
c004c55c 44923 2.25335 do_select
c0012804 47443 2.37975 memcpy
c0012980 50239 2.52 __copy_tofrom_user
c000452c 51645 2.59053 restore
c008c570 53061 2.66155 gem_rx
c004c7cc 56388 2.82844 sys_select
c008cae0 64265 3.22355 gem_interrupt
c0005b9c 148240 7.43576 idled
c000db34 242388 12.1583 openpic_read
wow. inside of open_pic.c, I bet it's code like this
while (openpic_read(addr) & OPENPIC_ACTIVITY);
that's showing up.
anyway, a short-term PPC oprofile TODO:
- further stress/stability testing (overnight etc)
- re-allow power_save_6xx() when not profiling
- actually use config options instead of hardcoding perfmon rate
- userspace profiling system call hooks
- fix op_start race between perfmon and decrementer (?)
- code to call timer_interrupt() at approximately HZ
independent of profile counter rate (or is it 2*HZ, heh)
- add support for other perfmon features (possible given that we have
to call timer_interrupt and thus need something periodic?)
If you play with this, please let me know how it goes. Ignoring the
rough edges it should be basically useable for kernel/module profiling,
even on code with irqs disabled.
-Bryan
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This archive was generated by hypermail 2b29 : Mon Mar 31 2003 - 22:00:19 EST