From: "normalperson (Eric Wong)" <normalperson@...>
Date: 2013-08-17T06:40:32+09:00
Subject: [ruby-core:56666] [ruby-trunk - Feature #8788] use eventfd on newer	Linux instead of pipe for timer thread


Issue #8788 has been updated by normalperson (Eric Wong).

File 0001-thread_pthread-use-eventfd-under-Linux-for-timer-thr.patch added

[PATCH] thread_pthread: use eventfd under Linux for timer thread

The timer thread is an ideal use case for eventfd because it is
only used to signal wakeups and not transfer data.

From eventfd(2) manpage:

   Applications can use an eventfd file descriptor instead of a pipe  (see
   pipe(2))  in  all  cases  where a pipe is used simply to signal events.
   The kernel overhead of an eventfd file descriptor is  much  lower  than
   that  of  a  pipe, and only one file descriptor is required (versus the
   two required for a pipe).

----------------------------------------
Feature #8788: use eventfd on newer Linux instead of pipe for timer thread
https://bugs.ruby-lang.org/issues/8788#change-41201

Author: normalperson (Eric Wong)
Status: Open
Priority: Low
Assignee: 
Category: core
Target version: current: 2.1.0


eventfd is a cheaper alternative to pipe for self-notification (signals) on Linux

I will submit patches in the next few days/weeks unless there are objections
(or somebody else wants to do it sooner).  I'd also like to cleanup some of the existing #ifdefs in that area while I'm at it.


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