Re: [patch 3/7] fs, notify: Add file handle entry intoinotify_inode_mark

[David Rientjes]

On Tue, 13 Nov 2012, Cyrill Gorcunov wrote:

> > The question is, how many `struct inotify_inode_mark's are instantiated
> > system-wide?  Could be millions?
> 
> Well, hard to tell, to be fair. On my testing machine only apache has been
> using inotify system as far as I remember, but for sure nothing except memory
> limit the number of inotify. But I think if one running machine with millions
> of inotify it's rather powerful machine with enough memory.
> 

Seems easy to determine if you boot with slub_nomerge on the command line 
and then read /sys/kernel/slab/inotify_inode_mark/objects.  On my system, 
that happens to be 210, but I'm sure you could come up with a realistic 
synthetic workload to make it much higher.
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