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SubjectRe: [RFC v2 PATCH 0/5] hugetlbfs: add fallocate support
Date
> 
> 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@alibaba-inc.com>

> 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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