Date: Mon, 16 Jan 2006 18:24:49 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Suleiman Souhlal <ssouhlal@FreeBSD.org>
Cc: Badari Pulavarty <pbadari@us.ibm.com>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, hugh@veritas.com, dvhltc@us.ibm.com,
       linux-mm@kvack.org, blaisorblade@yahoo.it, jdike@addtoit.com
Subject: Re: differences between MADV_FREE and MADV_DONTNEED
Message-ID: <20060116172449.GL15897@opteron.random>
References: <20051102014321.GG24051@opteron.random> <1130947957.24503.70.camel@localhost.localdomain> <20051111162511.57ee1af3.akpm@osdl.org> <1131755660.25354.81.camel@localhost.localdomain> <20051111174309.5d544de4.akpm@osdl.org> <43757263.2030401@us.ibm.com> <20060116130649.GE15897@opteron.random> <43CBC37F.60002@FreeBSD.org> <20060116162808.GG15897@opteron.random> <43CBD1C4.5020002@FreeBSD.org>
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On Mon, Jan 16, 2006 at 09:03:00AM -0800, Suleiman Souhlal wrote:
> Andrea Arcangeli wrote:
> 
> >We can also use it for the same purpose, we could add the pages to
> >swapcache mark them dirty and zap the ptes _after_ that.
> 
> Wouldn't that cause the pages to get swapped out immediately?

Not really, it would be a non blocking operation. But they could be
swapped out shortly later (that's the whole point of DONTNEED, right?),
once there is more memory pressure. Otherwise if they're used again, a
minor fault will happen and it will find the swapcache uptodate in ram.
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