From: Nathan Scott <nathans@sgi.com>
To: Tom Zanussi <zanussi@us.ibm.com>
Cc: Jens Axboe <axboe@suse.de>, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] blk queue io tracing support
Date: Wed, 31 Aug 2005 14:53:05 +1000 [thread overview]
Message-ID: <20050831145305.B4434621@wobbly.melbourne.sgi.com> (raw)
In-Reply-To: <20050831143309.A4434621@wobbly.melbourne.sgi.com>; from nathans@sgi.com on Wed, Aug 31, 2005 at 02:33:10PM +1000
On Wed, Aug 31, 2005 at 02:33:10PM +1000, Nathan Scott wrote:
> ...
> On an unrelated note, are there any known issues with using epoll
> on relayfs file descriptors? I'm having a few troubles, and just
> wondering if its me doing something silly, or if its known to not
> work...? Symptoms of the problem are epoll continually reaching
> its timeout with no modified fds found (when I know the inode has
> modified trace buffers attached) ...
Actually, poll(2) seems to have the same behaviour with a simpler
test case (i.e. no epoll, & with just one fd being polled) - if I
read(2) from it every few thousand usec (using the blktrace tool)
it sees new data, but if I poll, it never reports the descriptor
as changed (this is a 2.6.13 kernel with the relayfs patches from
-mm patched into it and Jens' blktrace patch generating the data
that I'm attempting to poll).
cheers.
--
Nathan
next prev parent reply other threads:[~2005-08-31 4:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-23 12:32 Jens Axboe
2005-08-24 1:03 ` Nathan Scott
2005-08-24 7:08 ` Jens Axboe
2005-08-24 7:19 ` Nathan Scott
2005-08-24 7:25 ` Jens Axboe
2005-08-24 9:28 ` Jens Axboe
2005-08-29 4:53 ` Nathan Scott
2005-08-29 5:57 ` Jens Axboe
2005-08-30 23:43 ` Nathan Scott
2005-08-31 7:31 ` Jens Axboe
2005-08-30 23:48 ` Nathan Scott
2005-08-30 23:58 ` Nathan Scott
2005-08-31 4:19 ` Tom Zanussi
2005-08-31 4:33 ` Nathan Scott
2005-08-31 4:53 ` Nathan Scott [this message]
2005-08-31 4:55 ` Tom Zanussi
2005-08-31 7:33 ` Jens Axboe
2005-09-02 11:20 ` Jens Axboe
2005-08-24 6:24 ` Nathan Scott
2005-08-24 7:08 ` Jens Axboe
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