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    SubjectRe: [PATCH RFC] x86: avoid atomic operation in test_and_set_bit_lock if possible
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    Le jeudi 24 mars 2011 à 21:00 +0100, Ingo Molnar a écrit :

    > One good way to see cache bounces is to run a misses/accesses ratio profile:
    >
    > perf top -e cache-misses -e cache-references --count-filter 10
    >

    Oh well , something must be broken...

    "perf top" is working here, but if I use any "-e ...." argument, it
    fails :
    # perf top -e cache-misses

    Error: sys_perf_event_open() syscall returned with 2 (No such file or directory).
    /bin/dmesg may provide additional information.

    Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?

    # grep PERF_EVENTS .config
    CONFIG_HAVE_PERF_EVENTS=y
    CONFIG_PERF_EVENTS=y
    CONFIG_HAVE_PERF_EVENTS_NMI=y

    Nothing in dmesg...

    uname -a
    Linux ed001 2.6.38-08165-g2712750-dirty #517 SMP Thu Mar 24 21:31:00 CET 2011 i686 i686 i386 GNU/Linux



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