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

[Cyrill Gorcunov]

On Tue, Nov 13, 2012 at 12:19:25AM -0800, David Rientjes wrote:
> 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.

Which would give about 26K of additional memory if c/r get used here. Not a
big number i guess?
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