Message-ID: <1422923185.14964.2.camel@stgolabs.net>
Subject: Re: [RFC PATCH] mm: madvise: Ignore repeated MADV_DONTNEED hints
From: Davidlohr Bueso <dave@stgolabs.net>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org,
        Minchan Kim <minchan@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
        linux-kernel@vger.kernel.org
Date: Mon, 02 Feb 2015 16:26:25 -0800
In-Reply-To: <20150202143541.1efdd2b571413200cb9a4698@linux-foundation.org>
References: <20150202165525.GM2395@suse.de>
	 <20150202140506.392ff6920743f19ea44cff59@linux-foundation.org>
	 <20150202221824.GN2395@suse.de>
	 <20150202143541.1efdd2b571413200cb9a4698@linux-foundation.org>
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On Mon, 2015-02-02 at 14:35 -0800, Andrew Morton wrote:
> On Mon, 2 Feb 2015 22:18:24 +0000 Mel Gorman <mgorman@suse.de> wrote:
> 
> > > Is there something
> > > preventing this from being addressed within glibc?
> >  
> > I doubt it other than I expect they'll punt it back and blame either the
> > application for being stupid or the kernel for being slow.
> 
> *Is* the application being stupid?  What is it actually doing? 
> Something like
> 
> pthread_routine()
> {
> 	p = malloc(X);
> 	do_some(work);
> 	free(p);

Ebizzy adds a time based loop in there. But yeah, pretty much a standard
pthread model.

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