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Re: Still seeing hangs in xlog_grant_log_space

To: Juerg Haefliger <juergh@xxxxxxxxx>
Subject: Re: Still seeing hangs in xlog_grant_log_space
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 8 May 2012 08:59:44 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <CADLDEKs4YbNzj2c0HKHwSdUfKy0efdQRe1rOsWDkWUgd+BOGHw@xxxxxxxxxxxxxx>
References: <CADLDEKs01GnxgYh2UTt1waVDUXHbB_RcBcUTBr5REFg5aD5jHA@xxxxxxxxxxxxxx> <20120425223845.GX9541@dastard> <CADLDEKvYkpUnMrqdMyqCmsYrZcUtiJ6ZRhrRu_ERTjn=r7M3Pg@xxxxxxxxxxxxxx> <20120426224412.GA9541@dastard> <CADLDEKs6oMDA-6OhmcFxyRoBVpduKtSput=53TQGn9NCAOXC1Q@xxxxxxxxxxxxxx> <20120426230738.GB9541@dastard> <CADLDEKuKLeYiqhQW0E9g_bS0VXoxPGPOck3N004Pxg4_Opbzow@xxxxxxxxxxxxxx> <20120427110922.GF9541@dastard> <CADLDEKtUHAGcOPT1jtcvyJVk+zsoL5_thYFtHJYs+w=6EGuVSA@xxxxxxxxxxxxxx> <CADLDEKs4YbNzj2c0HKHwSdUfKy0efdQRe1rOsWDkWUgd+BOGHw@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, May 05, 2012 at 09:44:35AM +0200, Juerg Haefliger wrote:
> >> But better would be to use the device number of the relevant
> >> filesystem to filter the events. The device is 252:2, which means in
> >> kernel terms is it:
> >>
> >>        dev = (major << 20) | minor
> >>            = 0xfc00002
> >>
> >> So you should be able to get just the xfs-hang events via:
> >>
> >> # trace-cmd record -e xfs\* -d 'dev == 0xfc00002'
> >>
> >> and as long as you don't host log files on /xfs-hang, it'll only
> >> record the workload running on the xfs-hang filesystem.
> >
> > Third try: 
> > https://region-a.geo-1.objects.hpcloudsvc.com:443/v1.0/AUTH_9630ead2-6194-40df-afd3-7395448d4536/xfs-hang/report-2012-04-27-180secs.tgz
> > Filtered by device, trace events go to a different filesystem.
> 
> Did anybody have a chance to look at the data?

I've had a quick look, but I need to write scripts to visualise it
(i.e. graph it) to determine if there's any pattern to the issue.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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