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

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Message-ID: <016801d0824a$ace5da80$06b18f80$@alibaba-inc.com>
Date:	Wed, 29 Apr 2015 15:04:02 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Mike Kravetz'" <mike.kravetz@...cle.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Cc:	"'Dave Hansen'" <dave.hansen@...ux.intel.com>,
	"'Naoya Horiguchi'" <n-horiguchi@...jp.nec.com>,
	"'David Rientjes'" <rientjes@...gle.com>,
	"'Hugh Dickins'" <hughd@...gle.com>,
	"'Davidlohr Bueso'" <dave@...olabs.net>,
	"'Aneesh Kumar'" <aneesh.kumar@...ux.vnet.ibm.com>,
	"'Christoph Hellwig'" <hch@...radead.org>
Subject: Re: [RFC v2 PATCH 0/5] hugetlbfs: add fallocate support

> 
> 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@...baba-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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