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Re: uarea swap-out

On Aug 16, 2009, at 5:07 PM, Mindaugas Rasiukevicius wrote:


The following patch removes the uarea swap-out functionality:

After some thought and discussion with few developers, I believe it is
worth, because it:

- Addresses the issue described in PR/38828.
- Gets small, but nice simplification in threading code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Removes __SWAP_BROKEN cases.
- Cuts around 1000 lines of code.


If we are going to get rid of swappable uareas, then we should go all the way.

finally kill struct user (which just contains the pcb). Move the pcb into the lwp as l_md.

The separate lwp pool should go away and the lwp should just be placed at the bottom of the uarea followed by the pcb. l_addr should be renamed l_pcb.

(shouldn't proc0paddr be renamed to lwp0laddr?)

For lwp0, there is no reason why it has to be copied to the lwp0 uarea and it can remain
where it is.

As page sizes increase, we also need to deal with subpage uareas.

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