Thanks for the clarification.
If the buffer and page cache are unified, what is lru ?. Is it part of the cpu cache, or part of the buffer ?.
Shameem
----- Original Message ----
> From: Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx>
> To: Shameem Ahamed <shameem.ahamed@xxxxxxxxx>
> Cc: kernelnewbies@xxxxxxxxxxxx
> Sent: Monday, September 28, 2009 9:00:28 PM
> Subject: Re: buffer and page retrievel
>
> Hi...
>
> this is also an area that confused me from long time ago, but
> hopefully now I got better. Here's my wording (let's assume all page
> mentioned here are file backed ones):
>
> if page fault happens, page cache will be checked to determined which
> page hold the corresponding disk block. If one is found, this page
> will be mapped into the related faulting process' VMA
>
> otherwise, if the data is not found in page cache, disk read will be
> engaged. Most likely it will be done in async style. Once it is loaded
> into page cache, this page will also be mapped into faulting process'
> VMA.
>
> Notice that I use the term "page cache" here, since in 2.6 buffer and
> page cache are unified and called as page cache.
>
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer
> blog: the-hydra.blogspot.com
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