FreeBSD 10.0-BETA1 #8 r256765M spend too much time in locks

[Andriy Gapon]

When that high load happens again could you please run some profiling tool that
is capable of capturing the whole stacks of hot code paths?

I can suggest two alternatives:

1. hwpmc
pmcstat -S instructions -O sample.out
pmcstat -R sample.out -G summary.out

2. The following DTrace script:

profile:::profile-1113
/!(curthread->td_flags & 0x20)/
{

        @stacks[stack()] = count();
}

END
{
        trunc(@stacks, 10);
        printa(@stacks);
}
-- 
Andriy Gapon