Re: regression with poll(2)

On Mon, Aug 20, 2012 at 09:54:59AM -0700, Sage Weil wrote:

quoted

<SNIP>

quoted

I've retested several times and confirmed that this change leads to the 
breakage, and also confirmed that reverting it on top of -rc1 also fixes 
the problem.

I've also added some additional instrumentation to my code and confirmed 
that the process is blocking on poll(2) while netstat is reporting 
data available on the socket.

What can I do to help track this down?

Can the following patch be tested please? It is reported to fix an fio
regression that may be similar to what you are experiencing but has not
been picked up yet.

This patch appears to resolve things for me as well, at least after a 
couple of passes.  I'll let you know if I see any further problems come up 
with more testing.

Thanks very much Sage.

-- 
Mel Gorman
SUSE Labs