Re: [RFC v2 PATCH 0/5] hugetlbfs: add fallocate support

[Hillf Danton]

> 
> hugetlbfs is used today by applications that want a high degree of
> control over huge page usage.  Often, large hugetlbfs files are used
> to map a large number huge pages into the application processes.
> The applications know when page ranges within these large files will
> no longer be used, and ideally would like to release them back to
> the subpool or global pools for other uses.  The fallocate() system
> call provides an interface for preallocation and hole punching within
> files.  This patch set adds fallocate functionality to hugetlbfs.
> 
> RFC v2:
>   Addressed alignment and error handling issues noticed by Hillf Danton
>   New region_del() routine for region tracking/resv_map of ranges
>   Fixed several issues found during more extensive testing
>   Error handling in region_del() when kmalloc() fails stills needs
>         to be addressed
>   madvise remove support remains
> 
> Mike Kravetz (5):
>   hugetlbfs: truncate_hugepages() takes a range of pages
>   hugetlbfs: remove region_truncte() as region_del() can be used
>   hugetlbfs: New huge_add_to_page_cache helper routine
>   hugetlbfs: add hugetlbfs_fallocate()
>   mm: madvise allow remove operation for hugetlbfs
> 

Acked-by: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>

>  fs/hugetlbfs/inode.c    | 169 ++++++++++++++++++++++++++++++++++++++++++++++--
>  include/linux/hugetlb.h |   8 ++-
>  mm/hugetlb.c            | 110 ++++++++++++++++++++++---------
>  mm/madvise.c            |   2 +-
>  4 files changed, 248 insertions(+), 41 deletions(-)
> 
> --
> 2.1.0

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