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[Bug translator/6932] c->busy can be non-atomic.


------- Additional Comments From mhiramat at redhat dot com  2008-11-13 17:37 -------
Hmm, however, the oprofile showed this did not so much improve performance on
ia64...

0.7.2 without this change:
---
000000000000cc20 9672      1.0968  stap_780d862f8ed31f54314ad730113ad90d_401.ko 
stap_780d862f8ed31f54314ad730113ad90d_401 enter_kprobe_probe
  000000000000cc20 589       6.0897
  000000000000cc40 48        0.4963
  000000000000cc58 36        0.3722
  000000000000cc60 4         0.0414
  000000000000cc64 38        0.3929
  000000000000cc70 272       2.8122
  000000000000cc80 176       1.8197
  000000000000cc84 217       2.2436
  000000000000cc90 39        0.4032
  000000000000cc98 47        0.4859
  000000000000cca4 40        0.4136
  000000000000ccb0 39        0.4032
  000000000000ccb8 60        0.6203
  000000000000ccc4 35        0.3619
  000000000000ccd0 38        0.3929
  000000000000d174 7869     81.3586
  000000000000d178 49        0.5066
  000000000000d180 43        0.4446
  000000000000d188 33        0.3412

git-with this change:
---
000000000000ce80 8448      0.9590  stap_9654f52ad4d73402acf5522fa20ffae3_401.ko 
stap_9654f52ad4d73402acf5522fa20ffae3_401 enter_kprobe_probe
  000000000000ce80 540       6.3920
  000000000000cea0 39        0.4616
  000000000000ceb8 40        0.4735
  000000000000cec4 48        0.5682
  000000000000ced0 230       2.7225
  000000000000cee0 161       1.9058
  000000000000cee4 200       2.3674
  000000000000cef0 37        0.4380
  000000000000cef8 44        0.5208
  000000000000cf04 34        0.4025
  000000000000cf10 31        0.3670
  000000000000cf18 42        0.4972
  000000000000cf24 36        0.4261
  000000000000cf30 43        0.5090
  000000000000d3d4 6801     80.5043
  000000000000d3d8 53        0.6274
  000000000000d3e0 33        0.3906
  000000000000d3e8 35        0.4143
  000000000000db20 1         0.0118

So, this issue is not so important...

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=6932

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