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Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2

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From: Ulrich Drepper <drepper@...>
To: Andrew Morton <akpm@...>
Cc: Rik van Riel <riel@...>, Jakub Jelinek <jakub@...>, linux-kernel <linux-kernel@...>, linux-mm <linux-mm@...>
Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2
Date: Friday, April 20, 2007 - 5:24 pm

On 4/20/07, Andrew Morton <akpm@linux-foundation.org> wrote:

Well, there's not really much to flesh out.  The current MADV_DONTNEED
is useful in some situations.  The behavior cannot be changed, even
glibc will rely on it for the case when MADV_FREE is not supported.

What might be nice to have is to have a POSIX-compliant
POSIX_MADV_DONTNEED implementation.  We currently do nothing which is
OK since no test suite can detect that.  But some code might want to
use the real behavior and we're missing an optimization possibility.

Just for reference: the MADV_CURRENT behavior is to throw away data in
the range.  The POSIX_MADV_DONTNEED behavior is to never lose data.
I.e., file backed data is written back, anon data is at most swapped
out.
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Messages in current thread:
[PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Tue Apr 17, 3:15 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Andrew Morton, (Sun Apr 22, 4:18 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Christoph Hellwig, (Sun Apr 22, 5:16 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Ulrich Drepper, (Sun Apr 22, 12:55 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Andrew Morton, (Fri Apr 20, 4:57 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Fri Apr 20, 5:38 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Hugh Dickins, (Sat Apr 21, 3:24 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Sat Apr 21, 2:06 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Andrew Morton, (Fri Apr 20, 6:06 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Fri Apr 20, 7:52 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Sat Apr 21, 10:36 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 12:28 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Sun Apr 22, 2:31 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Sun Apr 22, 8:16 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Sun Apr 22, 11:53 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Sun Apr 22, 11:58 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 6:07 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 6:12 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Sun Apr 22, 11:59 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 5:20 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 7:45 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 6:21 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Jakub Jelinek, (Mon Apr 23, 6:44 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 6:31 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 6:35 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 10:53 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Andrew Morton, (Mon Apr 23, 11:08 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 6:44 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 9:15 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Mon Apr 23, 9:58 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Paul Mackerras, (Tue Apr 24, 12:42 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Tue Apr 24, 1:13 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 10:16 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Sat Apr 21, 10:50 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Jakub Jelinek, (Sat Apr 21, 3:12 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Nick Piggin, (Mon Apr 23, 12:36 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Eric Dumazet, (Fri Apr 20, 8:48 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE, Rik van Riel, (Fri Apr 20, 11:58 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2, Rik van Riel, (Thu Apr 19, 5:15 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2, Andrew Morton, (Fri Apr 20, 5:03 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2, Ulrich Drepper, (Fri Apr 20, 5:24 pm)
Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2, Hugh Dickins, (Sat Apr 21, 3:37 am)
Re: [PATCH] lazy freeing of memory through MADV_FREE 2/2, Ulrich Drepper, (Sat Apr 21, 12:32 pm)