[PATCH 0/3] Add C version of recordmcount for MIPS

From: Wu Zhangjin
Date: Wed Oct 27 2010 - 06:59:31 EST

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From: Wu Zhangjin <wuzhangjin@xxxxxxxxx>

This patchset adds the C Version of recordmcount for MIPS, it includes the
necessary fixups for the MIPS64 support and module support of the old
recordmcount.c.

To add MIPS64 support, John has introduced function pointers which can be
overriden by specific e_machine(.e.g. EM_MIPS, EM_xx) in do_file() of
scripts/recordmcount.c. this method helps a lot, when migrating from the old
Perl recordmcount, the left Archs may possibly apply this method to add their
specific support. Maciej has simplified the MIPS specific ELF64_Rel.r_info and
the related functions.

The module support for MIPS is such a good application of John's method, it
adds MIPS_is_fake_mcount() to filter one of the two _mcount symbol of the long
mcount call, a function pointer: is_fake_mcount() points to the default 'empty'
fn_is_fake_mcount(), we overrides it by MIPS_is_fake_mcount() for EM_MIPS in
do_file().

At last, HAVE_C_RECORDMCOUNT is selected for MIPS to enable the C version of
recordmcount.

The whole support has been tested on my YeeLoong laptop(MIPS, Litten Endian),
including: 32bit kernel and moduels, 64bit kernel and modules.

Here is part of the testing log:

-------

root@yeeloong:~# lsmod
Module Size Used by
yeeloong_laptop 16142 0
sparse_keymap 3803 1 yeeloong_laptop
hwmon 1841 1 yeeloong_laptop
backlight 5627 1 yeeloong_laptop
power_supply 9512 1 yeeloong_laptop
output 2524 1 yeeloong_laptop

1. 32bit kernel and module

root@yeeloong:~# uname -a
Linux yeeloong 2.6.36-ftrace+ #71 PREEMPT Wed Oct 27 15:03:02 CST 2010 mips GNU/Linux
root@yeeloong:~# mount -t debugfs nodev /debug
root@yeeloong:~# echo function > /debug/tracing/current_tracer
root@yeeloong:~# echo 1 > /debug/tracing/tracing_enabled
root@yeeloong:~# sleep 1
root@yeeloong:~# echo 0 > /debug/tracing/tracing_enabled
root@yeeloong:~# head -20 /debug/tracing/trace
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
Xorg-1443 [000] 132.196336: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196337: fput <-poll_freewait
Xorg-1443 [000] 132.196338: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196339: fput <-poll_freewait
Xorg-1443 [000] 132.196340: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196341: fput <-poll_freewait
Xorg-1443 [000] 132.196342: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196343: fput <-poll_freewait
Xorg-1443 [000] 132.196344: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196345: fput <-poll_freewait
Xorg-1443 [000] 132.196346: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196347: fput <-poll_freewait
Xorg-1443 [000] 132.196348: remove_wait_queue <-poll_freewait
Xorg-1443 [000] 132.196349: fput <-poll_freewait
Xorg-1443 [000] 132.196351: poll_select_copy_remaining <-sys_select
Xorg-1443 [000] 132.196352: ktime_get_ts <-poll_select_copy_remaining
root@yeeloong:~# echo *yeeloong* > /debug/tracing/setKset_ftrace_filter
root@yeeloong:~# echo 1 > /debug/tracing/tracing_enabled
root@yeeloong:~# (Press Fn + Up/Down to trigger the functions in yeeloong_laptop module)
root@yeeloong:~# echo 0 > /tracing/tracing_enabled
root@yeeloong:~# head -20 /debug/tracing/trace
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
hald-addon-gene-1397 [000] 168.904096: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 170.414572: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 170.625428: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 170.806029: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 170.977210: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 171.262519: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 171.271132: yeeloong_set_brightness <-backlight_store_brightness
hald-addon-gene-1397 [000] 171.545363: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 171.679358: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 171.825652: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 171.996121: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 172.246240: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 172.383859: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 172.532963: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 172.844048: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1397 [000] 172.851410: yeeloong_set_brightness <-backlight_store_brightness
root@yeeloong:~# exit

2. 64bit kernel and module

root@yeeloong:~# uname -a
Linux yeeloong 2.6.36-ftrace+ #75 PREEMPT Wed Oct 27 16:12:20 CST 2010 mips64 GNU/Linux
root@yeeloong:~# mount -t debugfs nodev /debug
root@yeeloong:~# echo function > /debug/tracing/current_tracer
root@yeeloong:~# echo 1 > /debug/tracing/tracing_enabled
root@yeeloong:~# ls
[snip]
root@yeeloong:~# echo 0 > /debug/tracing/tracing_enabled
root@yeeloong:~# cat /debug/tracing/trace | head -20
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
<idle>-0 [000] 389.507465: complete <-usb_stor_blocking_completion
<idle>-0 [000] 389.507466: default_wake_function <-complete
<idle>-0 [000] 389.507467: try_to_wake_up <-default_wake_function
<idle>-0 [000] 389.507468: enqueue_task_fair <-try_to_wake_up
<idle>-0 [000] 389.507469: T.1160 <-enqueue_task_fair
<idle>-0 [000] 389.507470: check_preempt_curr_idle <-try_to_wake_up
<idle>-0 [000] 389.507472: usb_free_urb <-usb_hcd_giveback_urb
<idle>-0 [000] 389.507473: dma_pool_free <-qh_completions
<idle>-0 [000] 389.507475: mod_timer <-scan_async
<idle>-0 [000] 389.507476: usb_hcd_irq <-handle_IRQ_event
<idle>-0 [000] 389.507477: ohci_irq <-usb_hcd_irq
<idle>-0 [000] 389.507481: note_interrupt <-handle_level_irq
<idle>-0 [000] 389.507482: compat_irq_unmask <-handle_level_irq
<idle>-0 [000] 389.507483: enable_8259A_irq <-compat_irq_unmask
<idle>-0 [000] 389.507484: irq_exit <-do_IRQ
<idle>-0 [000] 389.507485: rcu_irq_exit <-irq_exit
root@yeeloong:~# echo *yeeloong* > /debug/tracing/set_ftrace_filter
root@yeeloong:~# echo 1 > /debug/tracing/tracing_enabled
root@yeeloong:~# (Press Fn + Up/Down here to trigger the kernel functions called in yeeloong_laptop module)
root@yeeloong:~# echo 0 > /debug/tracing/tracing_enabled
root@yeeloong:~# cat /debug/tracing/trace | head -20
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
hald-1378 [000] 414.479887: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480143: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480327: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480486: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480602: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480741: yeeloong_get_bat_props <-power_supply_show_property
hald-1378 [000] 414.480860: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.481609: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.482058: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.482185: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.482257: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.482333: yeeloong_get_bat_props <-power_supply_show_property
upowerd-1656 [000] 414.482414: yeeloong_get_bat_props <-power_supply_show_property
hald-addon-gene-1409 [000] 415.412442: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1409 [000] 416.135571: yeeloong_get_brightness <-backlight_show_actual_brightness
hald-addon-gene-1409 [000] 416.381292: yeeloong_get_brightness <-backlight_show_actual_brightness

--------

Thanks all.

Best Regards,
Wu Zhangjin

Wu Zhangjin (3):
ftrace/MIPS: Add MIPS64 support for C version of recordmcount
ftrace/MIPS: Add module support for C version of recordmcount
ftrace/MIPS: Enable C Version of recordmcount

arch/mips/Kconfig | 1 +
scripts/recordmcount.c | 44 ++++++++++++++++++++++++
scripts/recordmcount.h | 86 +++++++++++++++++++++++++++++++++++++++++++++---
3 files changed, 126 insertions(+), 5 deletions(-)

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Next message: Wu Zhangjin: "[PATCH 1/3] ftrace/MIPS: Add MIPS64 support for C version of recordmcount"
Previous message: Gleb Natapov: "Re: [PATCH 8/8] KVM: add debugfs file to show the number of asyncpf"
Next in thread: Wu Zhangjin: "[PATCH 1/3] ftrace/MIPS: Add MIPS64 support for C version of recordmcount"
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