Re: [PATCH] VFS: Pagecache usage optimization on pagesize !=blocksize environment

[Hisashi Hifumi]

>  But I'm slightly confused that the patch helps because I've always
>thought that mpage_readpage() (which is what we end up calling from
>do_generic_mapping_read()) always reads the whole page. Thus either all
>buffers in the page or none of them are uptodate... So what do I miss
>here?
>
>								Honza

On ext3/4, a file is written through buffer/block. So if a page has multiple 
buffers, buffers can be uptodate partially especially under random write workloads.
See __block_prepare_write and __block_commit_write.

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