[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [patch] Fix block I/O hang.

From: Anthony Liguori
Subject: Re: [Qemu-devel] [patch] Fix block I/O hang.
Date: Wed, 12 Nov 2008 08:58:28 -0600
User-agent: Thunderbird (X11/20080925)

Johannes Stezenbach wrote:

On Tue, Nov 11, 2008 at 06:48:00PM +0100, Gerd Hoffmann wrote:
Anthony Liguori wrote:
Under what circumstances?  posix_aio_read() is only invoked from a
select callback.  This means there should be data available to be read.
Third, when called from a select callback it shouldn't block indeed.  It
does though for me now and then when booting xen guests (with a big
stack of xenner patches).  Doesn't reproduce reliable though.  Sprinkled
in a printk (with rfd being non-blocking) and got a EAGAIN once, so it
got called with rfd not having data.

I don't know what kind of fd you're talking about, but the
Linux select man page says:

It's a pipe. The socket issue has bit me a number of times in the past though :-)


Anthony Liguori

reply via email to

[Prev in Thread] Current Thread [Next in Thread]