Re: [v3 0/9] parallelized "struct page" zeroing

From	David Miller <davem@davemloft.net>
Newsgroups	linux.kernel
Subject	Re: [v3 0/9] parallelized "struct page" zeroing
Date	2017-05-10 17:30 +0200
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From: Pasha Tatashin <pasha.tatashin@oracle.com>
Date: Wed, 10 May 2017 11:01:40 -0400

> Perhaps you are right, and I will measure on x86. But, I suspect hit
> can become unacceptable on some platfoms: there is an overhead of
> calling a function, even if it is leaf-optimized, and there is an
> overhead in memset() to check for alignments of size and address,
> types of setting (zeroing vs. non-zeroing), etc., that adds up
> quickly.

Another source of overhead on the sparc64 side is that we much
do memory barriers around the block initializiing stores.  So
batching calls to memset() amortize that as well.

Thread

[v3 0/9] parallelized "struct page" zeroing Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-05-05 19:10 +0200
  [v3 8/9] powerpc: teach platforms not to zero struct pages memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-05-05 19:10 +0200
  [v3 9/9] s390: teach platforms not to zero struct pages memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-05-05 19:10 +0200
    Re: [v3 9/9] s390: teach platforms not to zero struct pages memory Heiko Carstens <heiko.carstens@de.ibm.com> - 2017-05-08 13:40 +0200
  [v3 1/9] sparc64: simplify vmemmap_populate Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-05-05 19:10 +0200
  Re: [v3 0/9] parallelized "struct page" zeroing Michal Hocko <mhocko@kernel.org> - 2017-05-09 20:20 +0200
    Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-09 21:00 +0200
      Re: [v3 0/9] parallelized "struct page" zeroing Michal Hocko <mhocko@kernel.org> - 2017-05-10 09:30 +0200
        Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-10 15:50 +0200
          Re: [v3 0/9] parallelized "struct page" zeroing Michal Hocko <mhocko@kernel.org> - 2017-05-10 17:00 +0200
            Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-10 17:10 +0200
              Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-10 17:30 +0200
            Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-10 17:20 +0200
              Re: [v3 0/9] parallelized "struct page" zeroing Matthew Wilcox <willy@infradead.org> - 2017-05-10 19:20 +0200
                Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-10 20:10 +0200
                Re: [v3 0/9] parallelized "struct page" zeroing Matthew Wilcox <willy@infradead.org> - 2017-05-10 23:20 +0200
              Re: [v3 0/9] parallelized "struct page" zeroing Michal Hocko <mhocko@kernel.org> - 2017-05-11 10:10 +0200
                Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-11 16:40 +0200

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