Messages in this thread | | | Date | Mon, 18 Mar 2013 12:03:01 +0800 | From | Simon Jeons <> | Subject | Re: [PATCHv2, RFC 00/30] Transparent huge page cache |
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Hi Kirill, On 03/15/2013 01:50 AM, Kirill A. Shutemov wrote: > From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> > > Here's the second version of the patchset. > > The intend of the work is get code ready to enable transparent huge page > cache for the most simple fs -- ramfs. > > We have read()/write()/mmap() functionality now. Still plenty work ahead.
One offline question.
Why set PG_mlocked to page_tail which be splited in function __split_huge_page_refcount?
> > Any feedback is welcome. > > Changes since v1: > - mmap(); > - fix add_to_page_cache_locked() and delete_from_page_cache(); > - introduce mapping_can_have_hugepages(); > - call split_huge_page() only for head page in filemap_fault(); > - wait_split_huge_page(): serialize over i_mmap_mutex too; > - lru_add_page_tail: avoid PageUnevictable on active/inactive lru lists; > - fix off-by-one in zero_huge_user_segment(); > - THP_WRITE_ALLOC/THP_WRITE_FAILED counters; > > TODO: > - memcg accounting has not yet evaluated; > - collapse; > - migration (?); > - stats, knobs, etc.; > - tmpfs/shmem enabling; > > > Kirill A. Shutemov (30): > 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: avoid PageUnevictable on active/inactive lru lists > thp, mm: basic defines for transparent huge page cache > thp, mm: introduce mapping_can_have_hugepages() predicate > 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: add event counters for huge page alloc on write to a file > 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: wait_split_huge_page(): serialize over i_mmap_mutex too > thp, mm: truncate support for transparent huge page cache > thp, mm: split huge page on mmap file page > ramfs: enable transparent huge page cache > x86-64, mm: proper alignment mappings with hugepages > mm: add huge_fault() callback to vm_operations_struct > thp: prepare zap_huge_pmd() to uncharge file pages > thp: move maybe_pmd_mkwrite() out of mk_huge_pmd() > thp, mm: basic huge_fault implementation for generic_file_vm_ops > thp: extract fallback path from do_huge_pmd_anonymous_page() to a > function > thp: initial implementation of do_huge_linear_fault() > thp: handle write-protect exception to file-backed huge pages > thp: call __vma_adjust_trans_huge() for file-backed VMA > thp: map file-backed huge pages on fault > > arch/x86/kernel/sys_x86_64.c | 13 +- > fs/libfs.c | 50 ++++- > fs/ramfs/inode.c | 6 +- > include/linux/backing-dev.h | 10 + > include/linux/huge_mm.h | 36 +++- > include/linux/mm.h | 16 ++ > include/linux/pagemap.h | 24 ++- > include/linux/radix-tree.h | 3 + > include/linux/vm_event_item.h | 2 + > lib/radix-tree.c | 32 ++- > mm/filemap.c | 283 +++++++++++++++++++++---- > mm/huge_memory.c | 462 ++++++++++++++++++++++++++++++++++------- > mm/memory.c | 31 ++- > mm/swap.c | 3 +- > mm/truncate.c | 12 ++ > mm/vmstat.c | 2 + > 16 files changed, 842 insertions(+), 143 deletions(-) >
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