Messages in this thread | | | Date | Wed, 14 May 2014 13:39:45 +0200 | From | Jan Kara <> | Subject | Re: [PATCH V2 2/2] fs: print a message when freezing/unfreezing filesystems |
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On Wed 14-05-14 13:26:21, Mateusz Guzik wrote: > On Wed, May 14, 2014 at 01:14:49PM +0200, Jan Kara wrote: > > On Wed 14-05-14 00:04:43, Mateusz Guzik wrote: > > > This helps hang troubleshooting efforts when only dmesg is available. > > > > > > While here remove code duplication with MS_RDONLY case and fix a > > > whitespace nit. > > I'm somewhat undecided here I have to say. On one hand I don't like > > printing to kernel log when everything is fine and kernel is operating > > normally. On the other hand I've seen quite a few cases where people have > > shot themselves in the foot with filesystem freezing so having some trace > > of this in the log doesn't seem like a completely bad thing either. What do > > other people think? > > > > I would like to note that the kernel already prints messages when e.g. > filesystems get mounted. Yeah, that's a fair point.
> And yes, situations where I/O is frozen and hung task detector comes into > play happen more often than you may think. I can hide these behind a > sysctl if this helps. No, I don't think hiding behind sysctl is really needed.
> Finally, somewhat related to the first mail, my preferred message format > (which I was somewhat reluctant to propose earlier) would be: > > VFS (%s): Filesystem frozen by %s:%d > > with device, process and pid respectively. More common seems to be "%s (%d)" for process & pid but whatever. I like the format change.
Honza -- Jan Kara <jack@suse.cz> SUSE Labs, CR
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