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From: Mike Blumenkrantz <mike@zentific.com>
To: linux-kernel@vger.kernel.org
Subject: 2 epoll questions
Date: Mon, 29 Nov 2010 19:17:05 -0500	[thread overview]
Message-ID: <20101129191705.094f5c4d@darc.ath.cx> (raw)

Hi,

I am not subscribed to the list yet, and I would appreciate it if all replies
could be CCed to me :).

I have two questions regarding epoll.  The epoll code that I am using can all
be found in the file here for those interested:
https://svn.enlightenment.org/svn/e/trunk/ecore/src/lib/ecore/ecore_main.c

1) Is there any known reason why adding fds to an epoll fd would begin to slow
down dramatically after ~6000 fds are added?  It is entirely possible that the
problem is not epoll at all, but I wanted to ask and see if there was some O(n)
code somewhere that was known.

2) If a select on an epoll fd (not one inside the epoll, the actual epoll fd
itself) returns EBADF, is there a way to determine which fd is causing the
error and then remove it?  I am occasionally running into this issue, and it
seems to be caused by code which I do not necessarily control closing a fd that
is part of my epoll fd without my knowledge (meaning that the closed fd is
still in epoll).

Thanks!

-- 
Mike Blumenkrantz
Zentific: Our boolean values are huge.

             reply	other threads:[~2010-11-30  0:37 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-30  0:17 Mike Blumenkrantz [this message]
2010-11-30  7:03 ` Eric Dumazet
2010-12-01  2:43   ` Mike Blumenkrantz

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