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Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data structure

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On Mon, 20 Mar 2017, Huang, Ying wrote:

> From: Huang Ying <ying.huang@intel.com>
> 
> Now vzalloc() is used in swap code to allocate various data
> structures, such as swap cache, swap slots cache, cluster info, etc.
> Because the size may be too large on some system, so that normal
> kzalloc() may fail.  But using kzalloc() has some advantages, for
> example, less memory fragmentation, less TLB pressure, etc.  So change
> the data structure allocation in swap code to use kvzalloc() which
> will try kzalloc() firstly, and fallback to vzalloc() if kzalloc()
> failed.
> 

As questioned in -v1 of this patch, what is the benefit of directly 
compacting and reclaiming memory for high-order pages by first preferring 
kmalloc() if this does not require contiguous memory?

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[PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data structure "Huang, Ying" <ying.huang@intel.com> - 2017-03-20 10:00 +0100
  [PATCH -v2 2/2] mm, swap: Sort swap entries before free "Huang, Ying" <ying.huang@intel.com> - 2017-03-20 10:00 +0100
  Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap  data structure David Rientjes <rientjes@google.com> - 2017-03-20 22:40 +0100
    Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data structure "Huang\, Ying" <ying.huang@intel.com> - 2017-03-24 03:50 +0100
      Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data  structure John Hubbard <jhubbard@nvidia.com> - 2017-03-24 05:30 +0100
        Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data structure "Huang\, Ying" <ying.huang@intel.com> - 2017-03-24 06:00 +0100
          Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data  structure John Hubbard <jhubbard@nvidia.com> - 2017-03-24 07:50 +0100
            Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data structure "Huang\, Ying" <ying.huang@intel.com> - 2017-03-24 08:20 +0100
              Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data  structure John Hubbard <jhubbard@nvidia.com> - 2017-03-24 08:40 +0100
                Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data  structure Dave Hansen <dave.hansen@linux.intel.com> - 2017-03-24 15:00 +0100
                Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap  data structure Tim Chen <tim.c.chen@linux.intel.com> - 2017-03-24 18:00 +0100
                Re: [PATCH -v2 1/2] mm, swap: Use kvzalloc to allocate some swap data  structure John Hubbard <jhubbard@nvidia.com> - 2017-03-24 19:20 +0100

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