Messages in this thread | | | Date | Thu, 14 May 2009 11:21:14 -0000 | From | Thomas Gleixner <> | Subject | [patch 0/2] sched, timers: simplify calc_load and avoid cpu iteration loop |
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Dimitri Sivanich pointed out that calc_load iterates over all online CPUs under xtime lock which can cause long latencies on large SMP systems.
The following patch series removes the iteration loop and lets scheduler_tick() on each CPU update the number of active tasks. The calc_load() function just uses this variable and updates avenrun from do_timer().
Dimitri, can you please test run this on one of your large machines ?
Thanks,
tglx
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