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SubjectPATCH: Swap shared pages (was: How to read-protect a vm_area?)
Hi,

On Fri, 20 Feb 1998 00:41:19 -0500 (EST), "Benjamin C.R. LaHaise"
<blah@kvack.org> said:

> As Rik mentioned, please feel free to make use of linux-mm@kvack.org for
> discussion purposes. (echo subscribe | mail majordomo@kvack.org) It's
> been quite, but then it's Febuary.

OK. I'm CC:ing there.

The patch below, against 2.1.88, adds a bunch of new functionality to
the swapper. The main changes are:

* All swapping goes through the swap cache (aka. page cache) now.

* There is no longer a swap lock map. Because we need to atomically
test and create a new swap-cache page in order to do swap IO, it is
sufficient just to lock the struct page itself. Having only one
layer of locking to deal with removes a number of races concerning
swapping shared pages.

* We can swap shared pages, and still keep them shared when they are
swapped back in!!! Currently, only private shared pages (as in pages
shared after a fork()) benefit from this, but the basic mechanism will
be appropriate for MAP_ANONYMOUS | MAP_SHARED pages too
(implementation to follow). Pages will remain shared after a swapoff.

* The page cache is now quite happy dealing with swap-cache pages too.
In particular, write-ahead and read-ahead of swap through the page
cache will work fine (and in fact, write-ahead does get done already
under certain circumstances with this patch --- that's essentially how
the swapping of shared pages gets done). Support code to perform
asynchronous readahead of swap is included, but is not actually used
anywhere yet.

I've tested with a number of forked processes running with a shared
working set larger than physical memory, and with SysV shared memory.
I haven't found any problems with it so far.

Enjoy.

Cheers,
Stephen.

----------------------------------------------------------------
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end

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