Re: many processes stuck in "hmrrcm", system unusable

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

Matthew Dillon wrote:
> :
> :On chlamydia I have many processes stuck in "hmrrcm", making the system 
> :unusable - can't open new shells, etc.  After a minute or two the 
> :situation seems to improve again.
>
>     This is an inode moderation mechanic which will typically occur if
>     large numbers (thousands) of inodes have been dirtied and need to
>     be updated on-media.  It prevents hammer's inode structure allocations
>     from blowing away kernel memory and crashing the system.
>
>     A rm -rf or a tar extract is the most typical culprit but atime
>     updates can create issues as well if large portions of the filesystem
>     are being randomly read.  You can try mounting noatime to address
>     atime issues.

Shouldn't we rather try to fix the issue, i.e. make hammer work just a 
little bit performant and capable of concurrent use?  I think now that 
the code is stable we should start investigating performance (latency) 
issues and address them.

cheers
  simon

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