linux-kernel - Re: [PATCH] epoll: preserve ordering of events from ovflist

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Date:	Mon, 4 Mar 2013 03:05:00 +0000
From:	Eric Wong <normalperson@...t.net>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] epoll: preserve ordering of events from ovflist

Eric Wong <normalperson@...t.net> wrote:
> Events arriving in ovflist are stored in LIFO order, so
> we should account for that when inserting them into rddlist.

Fwiw, I noticed this oddity because I wanted to start tracing epitem
readiness (to detect when my application is not calling epoll_wait()
fast enough).

I have two more patches coming on top of this one:

Eric Wong (2):
      epoll: hoist out duplicated wake up logic
      epoll: add tracepoints for epitem enqueue/dequeue

 fs/eventpoll.c                   |  62 +++++++++++----------
 include/linux/eventpoll.h        |   8 +++
 include/trace/events/eventpoll.h | 113 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 155 insertions(+), 28 deletions(-)
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