Messages in this thread |  | | Date | Wed, 26 Sep 2001 15:22:01 -0300 (BRT) | From | Marcelo Tosatti <> | Subject | Re: broken VM in 2.4.10-pre9 |
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On Tue, 25 Sep 2001, Pavel Machek wrote:
> Hi! > > > > So my suggestion was to look at getting anonymous pages backed by what > > > amounts to a shared memory segment. In that vein. By using an extent > > > based data structure we can get the cost down under the current 8 bits > > > per page that we have for the swap counts, and make allocating swap > > > pages faster. And we want to cluster related swap pages anyway so > > > an extent based system is a natural fit. > > > > Much of this goes away if you get rid of both the swap and anonymous page > > special cases. Back anonymous pages with the "whoops everything I write here > > vanishes mysteriously" file system and swap with a swapfs > > What exactly is anonymous memory? I thought it is what you do when you > want to malloc(), but you want to back that up by swap, not /dev/null.
Anonymous memory is memory which is not backed by a filesystem or a device. eg: malloc()ed memory, shmem, mmap(MAP_PRIVATE) on a file (which will create anonymous memory as soon as the program which did the mmap writes to the mapped memory (COW)), etc.
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