Messages in this thread |  | | Date | Thu, 27 Sep 2001 01:44:31 +0200 | From | Pavel Machek <> | Subject | Re: broken VM in 2.4.10-pre9 |
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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.
So... how can alan propose to back anonymous memory with /dev/null? [see above] It should be backed by swap, no? Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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