Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1472903

Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range

From Ross Zwisler <ross.zwisler@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range
Date 2016-08-31 00:10 +0200
Message-ID <sbZod-2i7-1@gated-at.bofh.it> (permalink)
References (3 earlier) <sbxrX-14K-5@gated-at.bofh.it> <sbzk5-2el-25@gated-at.bofh.it> <sbzk5-2el-23@gated-at.bofh.it> <sbA6u-2Nk-37@gated-at.bofh.it> <sbZex-1ZK-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

Show all headers | View raw

On Tue, Aug 30, 2016 at 02:56:17PM -0700, Dan Williams wrote:
> On Mon, Aug 29, 2016 at 11:52 AM, Matthew Wilcox <mawilcox@microsoft.com> wrote:
> > It may be protected by the mapping lock in the current code, but I would it expect it to become an RCU lookup + lock eventually.  No mapping lock, just like the page cache.
> >
> > Even if we can work around it, why do we want to?  What's the compelling reason to change from the current radix tree representation of order-N entries to an arbitrary range?  There are no in-kernel users right now; is there a performance reason to change?  We don't usually change an API in anticipation of future users appearing, particularly when the API makes it harder for the existing users to use it.
> 
> I'd use a fill range api for the radix backing get_dev_pagemap() and
> potentially another use in device-dax.  It centralizes the common
> routine of breaking down a range into its constituent power-of-2
> ranges.

Does your usage not work with the current sibling & canonical entry model?

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-08-27 16:20 +0200
  RE: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Matthew Wilcox <mawilcox@microsoft.com> - 2016-08-29 17:40 +0200
    Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-08-29 18:20 +0200
      Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-08-29 20:20 +0200
        RE: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Matthew Wilcox <mawilcox@microsoft.com> - 2016-08-29 21:10 +0200
          Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Dan Williams <dan.j.williams@intel.com> - 2016-08-31 00:00 +0200
            Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-31 00:10 +0200
              Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Dan Williams <dan.j.williams@intel.com> - 2016-08-31 00:30 +0200
                Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-31 01:00 +0200
                Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-09-01 08:20 +0200
                RE: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-02 20:20 +0200
                Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-09-03 07:00 +0200
                RE: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Matthew Wilcox <mawilcox@microsoft.com> - 2016-08-31 17:00 +0200
                Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Dan Williams <dan.j.williams@intel.com> - 2016-08-31 18:50 +0200
                Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Konstantin Khlebnikov <koct9i@gmail.com> - 2016-09-01 08:20 +0200
          Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-31 00:10 +0200
      RE: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Matthew Wilcox <mawilcox@microsoft.com> - 2016-08-29 20:30 +0200
  Re: [PATCH RFC 1/4] lib/radix: add universal radix_tree_fill_range Ross Zwisler <ross.zwisler@linux.intel.com> - 2016-08-31 00:40 +0200

csiph-web