Re: [PATCH] tracing: Merge separate resize loops
From: Vaibhav Nagarnaik
Date: Fri May 18 2012 - 23:01:21 EST
On Fri, May 18, 2012 at 6:56 PM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> On Fri, 2012-05-18 at 13:29 -0700, Vaibhav Nagarnaik wrote:
>>
>> /* wait for all the updates to complete */
>> for_each_buffer_cpu(buffer, cpu) {
>> cpu_buffer = buffer->buffers[cpu];
>> - if (!cpu_buffer->nr_pages_to_update||
>> - !cpu_online(cpu))
>> + if (!cpu_buffer->nr_pages_to_update)
>> continue;
>>
>
> Why did you make this change? As we only need to wait for completions.
>
>> - wait_for_completion(&cpu_buffer->update_completion);
>> - /* reset this value */
>> + if (cpu_online(cpu))
>> + wait_for_completion(&cpu_buffer->update_done);
>> cpu_buffer->nr_pages_to_update = 0;
>
> Or was the original patch buggy, where we never set nr_page_to_update to
> zero for the offline case?
I don't see a bug, since at the start of the resize operation, we
always recalculate this value. It will be reset to 0, if there are no
updates. I set it to zero at the end just as a precautionary measure.
Vaibhav Nagarnaik
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