Re: [PATCH 00/15] various perf counter bits
From: Ingo Molnar
Date: Tue Apr 07 2009 - 05:23:55 EST
another thing i noticed is that our CPU migration counters look a
bit weird:
aldebaran:~/linux/linux/Documentation/perf_counter> taskset 1 perfstat ls
design.txt kerneltop kerneltop.c Makefile perfstat
Performance counter stats for 'ls':
0.686802 task clock ticks (msecs)
3 context switches (events)
4 CPU migrations (events)
285 pagefaults (events)
2183899 CPU cycles (events)
1492516 instructions (events)
24638 cache references (events)
1763 cache misses (events)
Wall-clock time elapsed: 0.694796 msecs
the 'taskset 1' binds perfstat to a single CPU - still we had 4
cross-CPU migrations?
Ingo
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