how to know ext cache hit rate?

[fsluck]

i think  it is page cache.
my case is in virualization environment,
because  vm's disk image is much larger than system's cache, i want to know when many vms are running  if system cache hit rate is very  low?   if there is a need to  seek for other way to suit virtualization.
 
system's default cache mechanism does not care about virtualization.
 
thanks 





At 2013-12-26 02:00:43,"Theodore Ts'o" <tytso at mit.edu> wrote:
>On Wed, Dec 25, 2013 at 09:32:50AM +0800, fsluck wrote:
>> how to know ext cache hit rate?
>
>Which cache are you referring to, specifically?  The page cache?  The
>inode cache?  The dentry cache?
>
>What problem are you trying to solve, at a high level?
>
>     	     	     	       	      - Ted
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