Date: Wed, 29 May 2013 23:01:01 +0200
From: Andi Kleen <andi@firstfloor.org>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Andi Kleen <andi@firstfloor.org>, Waiman Long <waiman.long@hp.com>,
        Dave Chinner <david@fromorbit.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Jeff Layton <jlayton@redhat.com>, Miklos Szeredi <mszeredi@suse.cz>,
        Ian Kent <raven@themaw.net>, Sage Weil <sage@inktank.com>,
        Steve French <sfrench@samba.org>,
        Trond Myklebust <Trond.Myklebust@netapp.com>,
        Eric Paris <eparis@redhat.com>, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, autofs@vger.kernel.org,
        ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org,
        linux-nfs@vger.kernel.org, "Chandramouleeswaran, Aswin" <aswin@hp.com>,
        "Norton, Scott J" <scott.norton@hp.com>
Subject: Re: [PATCH 0/3 v3] dcache: make it more scalable on large system
Message-ID: <20130529210101.GN6123@two.firstfloor.org>
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On Wed, May 29, 2013 at 04:43:23PM -0400, J. Bruce Fields wrote:
> 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?

"perf top" does it live.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.