Re: What're major faults and minor faults?

[Rik van Riel <riel@conectiva.com.br>]

On Fri, 6 Sep 2002, jean wrote:

> I was reading mm/memory.c the page faults management
> part. Does every major fault corresponding to a disk
> read? And a minor fault to only an allocation of page
> frame?

In theory every major fault would correspond to a disk read, indeed.

A minor fault, OTOH, could also just consist of setting up a page
table entry to point to an already present page, ie. without even
having to allocate a page frame.

> but the line:
> 1131         page = read_swap_cache_async(entry);
>
> may result in a cache hit, right?

But is this line called in case of a cache hit ?

regards,

Rik
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