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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/