oprofile: Remove 'WQ on CPUx, prefer CPUy' warning
Under certain workloads we see the following warnings: WQ on CPU0, prefer CPU1 WQ on CPU0, prefer CPU2 WQ on CPU0, prefer CPU3 It warns the user that the wq to access a per-cpu buffers runs not on the same cpu. This happens if the wq is rescheduled on a different cpu than where the buffer is located. This was probably implemented to detect performance issues. Not sure if there actually is one as the buffers are copied to a single buffer anyway which should be the actual bottleneck. We wont change WQ implementation. Since a user can do nothing the warning is pointless. Removing it. Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
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1 changed files with 3 additions and 8 deletions
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@ -451,15 +451,10 @@ static void wq_sync_buffer(struct work_struct *work)
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{
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struct oprofile_cpu_buffer *b =
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container_of(work, struct oprofile_cpu_buffer, work.work);
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if (b->cpu != smp_processor_id()) {
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printk(KERN_DEBUG "WQ on CPU%d, prefer CPU%d\n",
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smp_processor_id(), b->cpu);
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if (!cpu_online(b->cpu)) {
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if (b->cpu != smp_processor_id() && !cpu_online(b->cpu)) {
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cancel_delayed_work(&b->work);
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return;
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}
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}
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sync_buffer(b->cpu);
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/* don't re-add the work if we're shutting down */
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