From: "J. Bruce Fields" <bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
To: Andi Kleen <andi-Vw/NltI1exuRpAAqCnN02g@public.gmane.org>
Cc: Waiman Long <waiman.long-VXdhtT5mjnY@public.gmane.org>,
Dave Chinner <david-FqsqvQoI3Ljby3iVrkZq2A@public.gmane.org>,
Alexander Viro
<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Miklos Szeredi <mszeredi-AlSwsSmVLrQ@public.gmane.org>,
Ian Kent <raven-PKsaG3nR2I+sTnJN9+BGXg@public.gmane.org>,
Sage Weil <sage-4GqslpFJ+cxBDgjK7y7TUQ@public.gmane.org>,
Steve French <sfrench-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
Trond Myklebust
<Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>,
Eric Paris <eparis-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
autofs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"Chandramouleeswaran, Aswin" <aswin-VXdhtT5mjnY@public.gmane.org>,
"Norton, Scott J" <scott.norton-VXdhtT5mjnY@public.gmane.org>
Subject: Re: [PATCH 0/3 v3] dcache: make it more scalable on large system
Date: Wed, 29 May 2013 16:43:23 -0400 [thread overview]
Message-ID: <20130529204323.GC3243@fieldses.org> (raw)
In-Reply-To: <20130529203700.GM6123-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
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
next prev parent reply other threads:[~2013-05-29 20:43 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-23 1:37 [PATCH 0/3 v3] dcache: make it more scalable on large system Waiman Long
2013-05-23 1:37 ` [PATCH 1/3 v3] dcache: Don't take unnecessary lock in d_count update Waiman Long
2013-05-23 1:37 ` Waiman Long
2013-05-23 1:37 ` [PATCH 2/3 v3] dcache: introduce a new sequence read/write lock type Waiman Long
2013-05-23 1:37 ` Waiman Long
2013-05-23 1:37 ` [PATCH 3/3 v3] dcache: change rename_lock to a sequence read/write lock Waiman Long
2013-05-23 1:37 ` Waiman Long
2013-05-23 9:42 ` [PATCH 0/3 v3] dcache: make it more scalable on large system Dave Chinner
2013-05-23 21:34 ` Waiman Long
2013-05-27 2:09 ` Dave Chinner
2013-05-29 15:55 ` Waiman Long
[not found] ` <51A624E2.3000301-VXdhtT5mjnY@public.gmane.org>
2013-05-29 16:13 ` Andi Kleen
[not found] ` <20130529161358.GJ6123-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2013-05-29 20:23 ` Waiman Long
2013-05-29 16:18 ` Simo Sorce
2013-05-29 16:56 ` Andi Kleen
2013-05-29 17:03 ` Simo Sorce
2013-05-29 20:37 ` Waiman Long
[not found] ` <1369844289.2769.146.camel-Hs+ccMQdwurzDu64bZtGtWD2FQJk+8+b@public.gmane.org>
2013-05-29 20:32 ` Waiman Long
2013-05-29 18:46 ` J. Bruce Fields
2013-05-29 20:37 ` Andi Kleen
[not found] ` <20130529203700.GM6123-1g7Xle2YJi4/4alezvVtWx2eb7JE58TQ@public.gmane.org>
2013-05-29 20:43 ` J. Bruce Fields [this message]
2013-05-29 21:01 ` Andi Kleen
2013-05-29 21:19 ` Jörn Engel
2013-05-30 15:48 ` Waiman Long
2013-05-30 15:11 ` Jörn Engel
2013-06-06 3:48 ` Dave Chinner
2013-05-29 20:40 ` Waiman Long
-- strict thread matches above, loose matches on Subject: below --
2013-05-23 1:37 Waiman Long
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