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From: Andrew Morton <akpm@digeo.com>
To: frankeh@watson.ibm.com
Cc: Mark_H_Johnson@raytheon.com, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [PATCH] recognize MAP_LOCKED in mmap() call
Date: Wed, 25 Sep 2002 09:35:40 -0700	[thread overview]
Message-ID: <3D91E5DC.665EB3AC@digeo.com> (raw)
In-Reply-To: 200209251142.29341.frankeh@watson.ibm.com

Hubertus Franke wrote:
> 
> ...
> This is what the manpage says...
> 
>        mlockall  disables  paging  for  all pages mapped into the
>        address space of the calling process.  This  includes  the
>        pages  of  the  code,  data  and stack segment, as well as
>        shared libraries, user space kernel  data,  shared  memory
>        and  memory  mapped files. All mapped pages are guaranteed
>        to be resident  in  RAM  when  the  mlockall  system  call
>        returns  successfully  and  they are guaranteed to stay in
>        RAM until the pages  are  unlocked  again  by  munlock  or
>        munlockall  or  until  the  process  terminates  or starts
>        another program with exec.  Child processes do not inherit
>        page locks across a fork.
> 
> Do you read that all pages must be faulted in apriori ?

For MCL_FUTURE.

> Or is it sufficient to to make sure non of the currently mapped
> pages are swapped out and future swapout is prohibited.

I'd say that we should try to make all the pages present.  But
if it's a problem for (say) a hugepage implementation then it's
unlikely that the world would end if these things were still
demand paged in.

  reply	other threads:[~2002-09-25 16:30 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-18 19:18 [PATCH] recognize MAP_LOCKED in mmap() call Mark_H_Johnson
2002-09-18 19:39 ` Rik van Riel
2002-09-18 19:54 ` Andrew Morton
2002-09-25 15:42   ` Hubertus Franke
2002-09-25 16:35     ` Andrew Morton [this message]
2002-09-25 15:36 ` Hubertus Franke
  -- strict thread matches above, loose matches on Subject: below --
2002-09-25 16:57 Mark_H_Johnson
2002-09-13  3:33 [PATCH] per-zone kswapd process Dave Hansen
2002-09-13 13:05 ` Alan Cox
2002-09-13 21:30   ` William Lee Irwin III
2002-09-18 16:07     ` [PATCH] recognize MAP_LOCKED in mmap() call Hubertus Franke
2002-09-18 16:29       ` Andrew Morton

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