linux-kernel - Re: [patch 3/7] fs, notify: Add file handle entry into inotify_inode

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Date:	Tue, 13 Nov 2012 00:19:25 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	aneesh.kumar@...ux.vnet.ibm.com, bfields@...ldses.org
Subject: Re: [patch 3/7] fs, notify: Add file handle entry into
 inotify_inode_mark

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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