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SubjectRe: [PATCH, RFC 00/16] Transparent huge page cache
On 01/28/2013 05:24 PM, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> Here's first steps towards huge pages in page cache.
>
> The intend of the work is get code ready to enable transparent huge page
> cache for the most simple fs -- ramfs.
>
> It's not yet near feature-complete. It only provides basic infrastructure.
> At the moment we can read, write and truncate file on ramfs with huge pages in
> page cache. The most interesting part, mmap(), is not yet there. For now
> we split huge page on mmap() attempt.
>
> I can't say that I see whole picture. I'm not sure if I understand locking
> model around split_huge_page(). Probably, not.
> Andrea, could you check if it looks correct?

Is there any thp performance test benchmark? For anonymous pages or file
pages.

>
> Next steps (not necessary in this order):
> - mmap();
> - migration (?);
> - collapse;
> - stats, knobs, etc.;
> - tmpfs/shmem enabling;
> - ...
>
> Kirill A. Shutemov (16):
> block: implement add_bdi_stat()
> mm: implement zero_huge_user_segment and friends
> mm: drop actor argument of do_generic_file_read()
> radix-tree: implement preload for multiple contiguous elements
> thp, mm: basic defines for transparent huge page cache
> thp, mm: rewrite add_to_page_cache_locked() to support huge pages
> thp, mm: rewrite delete_from_page_cache() to support huge pages
> thp, mm: locking tail page is a bug
> thp, mm: handle tail pages in page_cache_get_speculative()
> thp, mm: implement grab_cache_huge_page_write_begin()
> thp, mm: naive support of thp in generic read/write routines
> thp, libfs: initial support of thp in
> simple_read/write_begin/write_end
> thp: handle file pages in split_huge_page()
> thp, mm: truncate support for transparent huge page cache
> thp, mm: split huge page on mmap file page
> ramfs: enable transparent huge page cache
>
> fs/libfs.c | 54 +++++++++---
> fs/ramfs/inode.c | 6 +-
> include/linux/backing-dev.h | 10 +++
> include/linux/huge_mm.h | 8 ++
> include/linux/mm.h | 15 ++++
> include/linux/pagemap.h | 14 ++-
> include/linux/radix-tree.h | 3 +
> lib/radix-tree.c | 32 +++++--
> mm/filemap.c | 204 +++++++++++++++++++++++++++++++++++--------
> mm/huge_memory.c | 62 +++++++++++--
> mm/memory.c | 22 +++++
> mm/truncate.c | 12 +++
> 12 files changed, 375 insertions(+), 67 deletions(-)
>



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