Basic MM question

Basic MM question

[Dave McCracken]

My apologies if this is a newbie question.  I'm still trying to figure out 
the fine points of how MM works.

Why does read_swap_cache_async use GFP_USER as opposed to GFP_HIGHUSER for 
swapped in pages?  Is there some characteristic of reading swap pages that 
doesn't allow use of highmem?  Since anonymous pages can be allocated from 
highmem, it seems to me it would make sense to also allow highmem pages 
once they've been swapped out and back in.

Dave McCracken

======================================================================
Dave McCracken          IBM Linux Base Kernel Team      1-512-838-3059
dmc@austin.ibm.com                                      T/L   678-3059

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Re: Basic MM question

[Rik van Riel]

On Wed, 18 Jul 2001, Dave McCracken wrote:

> My apologies if this is a newbie question.  I'm still trying to figure out
> the fine points of how MM works.
>
> Why does read_swap_cache_async use GFP_USER as opposed to GFP_HIGHUSER for
> swapped in pages?

You may not have figured out how the VM works, but you
sure figured out why it isn't currently working as
expected ;)

This is a bug, thanks for tracking it down.

Rik
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