Re: [PATCH 0/3 v3] dcache: make it more scalable on large system

[J. Bruce Fields]

On Wed, May 29, 2013 at 10:37:00PM +0200, Andi Kleen wrote:
> > As Dave said before, is the last path component sufficient?  Or how
> > about an inode number?
> 
> Neither works, the profiler needs to find the file and read it.
> 
> inode searching would be incredible expensive,

How fast does it need to be?  Actually analyzing the profile is
something you only do once after everything's over, right?

> unless the file system provided a "open-by-inode" primitive

Well, I suppose there is open_by_handle_at.

--b.

> In normal operation you only have that event when starting up the
> program and when each shared library gets mapped in.
> 
> -Andi
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