[jira] [Created] (TS-2137) Use eventfd instread of pthread signal/wait to speed up logging

["Yunkai Zhang (JIRA)" <ji...@apache.org>]

Yunkai Zhang created TS-2137:
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             Summary: Use eventfd instread of pthread signal/wait to speed up logging
                 Key: TS-2137
                 URL: https://issues.apache.org/jira/browse/TS-2137
             Project: Traffic Server
          Issue Type: Improvement
          Components: Logging
            Reporter: Yunkai Zhang


At the end of lifetime of each http connection, the logging action will call pthread_cond_signal() to notify flush threads.

As we known, pthread_cond_signal() need to take lock, it'll cause more context switch than eventfd.

The logging speed is very important for us which will affect RT, it is worth optimizing. 

I can confirm that evenfd is supported in Linux platform. 

Let's optimize it in Linux firstly.

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