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    SubjectRe: mmotm 2009-04-10-02-21 uploaded - forkbombed by work_for_cpu
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    On Mon, 13 Apr 2009 10:27:49 PDT, Andrew Morton said:

    > From: Andrew Morton <akpm@linux-foundation.org>
    >
    > Atttempting to rid us of the problematic work_on_cpu(). Just use
    > smp_call_fuction_single() here.
    >
    > This repairs a 10% sysbench(oltp)+mysql regression which Mike reported,
    > due to
    >
    > commit 6b44003e5ca66a3fffeb5bc90f40ada2c4340896
    > Author: Andrew Morton <akpm@linux-foundation.org>
    > Date: Thu Apr 9 09:50:37 2009 -0600
    >
    > work_on_cpu(): rewrite it to create a kernel thread on demand
    >
    > It seems that the kernel calls these acpi-cpufreq functions at a quite
    > high frequency.

    I put the one reverted commit back on (making it back into what was stock
    mmotm-0410 that had the problem) and then applied this patch. I'm seeing
    near-zero forks/second again, the CPU is at 1Ghz when idling (as it should
    be), if I kick off 2 'for(;;)' cycle-suckers it goes to 2Ghz, And it even
    puts 1 CPU at 1Ghz and the other at 2Ghz if there's only one running - I didn't
    know a Core2 Duo could do that. ;)

    So life is good again. ;)
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