Re: [PATCH 0/3] Create large folios in iomap buffered write path

[Wang Yugui <wangyugui@xxxxxxxxxxxx>]

Hi,

> Hi,
> 
> > Wang Yugui has a workload which would be improved by using large folios.
> > Until now, we've only created large folios in the readahead path,
> > but this workload writes without reading.  The decision of what size
> > folio to create is based purely on the size of the write() call (unlike
> > readahead where we keep history and can choose to create larger folios
> > based on that history even if individual reads are small).
> > 
> > The third patch looks like it's an optional extra but is actually needed
> > for the first two patches to work in the write path, otherwise it limits
> > the length that iomap_get_folio() sees to PAGE_SIZE.
> > 
> > Matthew Wilcox (Oracle) (3):
> >   filemap: Allow __filemap_get_folio to allocate large folios
> >   iomap: Create large folios in the buffered write path
> >   iomap: Copy larger chunks from userspace
> 
> The [PATCH 2/3] is a little difficult to backport to 6.1.y(LTS),
> it need some patches as depency.
> 
> so please provide those patches based on 6.1.y(LTS)  and depency list?
> then we can do more test on 6.1.y(LTS) too.

I selected 8 patches as depency
    d7b64041164c :Dave Chinner: iomap: write iomap validity checks

    7a70a5085ed0 :Andreas Gruenbacher: iomap: Add __iomap_put_folio helper
    80baab88bb93 :Andreas Gruenbacher: iomap/gfs2: Unlock and put folio in page_done handler
    40405dddd98a :Andreas Gruenbacher: iomap: Rename page_done handler to put_folio

    98321b5139f9 :Andreas Gruenbacher: iomap: Add iomap_get_folio helper

    9060bc4d3aca :Andreas Gruenbacher: iomap/gfs2: Get page in page_prepare handler
    07c22b56685d :Andreas Gruenbacher: iomap: Add __iomap_get_folio helper
    c82abc239464 :Andreas Gruenbacher: iomap: Rename page_prepare handler to get_folio

then rebased path 1, 2 ( see attachment files).

Now we can test patch 1,2,3 on 5.1.31.

Best Regards
Wang Yugui (wangyugui@xxxxxxxxxxxx)
2023/05/31

Attachment: 0001-filemap-Allow-__filemap_get_folio-to-allocate-large-.patch
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Attachment: 0002-iomap-Create-large-folios-in-the-buffered-write-path.patch
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