lkml.org 
[lkml]   [2020]   [Apr]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [RFC PATCH 0/8] dax: Add a dax-rmap tree to support reflink
    On Mon, Apr 27, 2020 at 04:47:42PM +0800, Shiyang Ruan wrote:
    > This patchset is a try to resolve the shared 'page cache' problem for
    > fsdax.
    >
    > In order to track multiple mappings and indexes on one page, I
    > introduced a dax-rmap rb-tree to manage the relationship. A dax entry
    > will be associated more than once if is shared. At the second time we
    > associate this entry, we create this rb-tree and store its root in
    > page->private(not used in fsdax). Insert (->mapping, ->index) when
    > dax_associate_entry() and delete it when dax_disassociate_entry().

    Do we really want to track all of this on a per-page basis? I would
    have thought a per-extent basis was more useful. Essentially, create
    a new address_space for each shared extent. Per page just seems like
    a huge overhead.

    \
     
     \ /
      Last update: 2020-04-27 14:28    [W:4.033 / U:0.244 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site