linux-kernel - Re: [RFC][PATCH] fs: optimize inotify/fsnotify code for unwatched files

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Message-ID: <20150623003119.GF3892@linux.vnet.ibm.com>
Date:	Mon, 22 Jun 2015 17:31:19 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dave Hansen <dave@...1.net>, Andi Kleen <ak@...ux.intel.com>,
	dave.hansen@...ux.intel.com, akpm@...ux-foundation.org,
	jack@...e.cz, viro@...iv.linux.org.uk, eparis@...hat.com,
	john@...nmccutchan.com, rlove@...ve.org,
	tim.c.chen@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] fs: optimize inotify/fsnotify code for unwatched
 files

On Mon, Jun 22, 2015 at 09:03:08PM +0200, Peter Zijlstra wrote:
> On Mon, Jun 22, 2015 at 09:29:49AM -0700, Paul E. McKenney wrote:
> 
> > I believe that there still are some cases.  But why would offline
> > CPUs seem so iffy?  CPUs coming up execute code before they are fully
> > operational, and during that time, much of the kernel views them as
> > being offline.  Yet they do have to execute significant code in order
> > to get themselves set up.
> 
> I'm thinking we do far too much during bringup and tear-down as it is.
> But yes maybe.

Boot, suspend, and hibernation indeed would be faster if we did less,
but we still will have to do something.

							Thanx, Paul

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