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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 2017-05-12 19:40 +0200
Message-ID <tGmHM-7YH-5@gated-at.bofh.it> (permalink)
References <tG3vu-37w-65@gated-at.bofh.it> <tGm54-7o1-11@gated-at.bofh.it> <tGmy6-7Uc-37@gated-at.bofh.it>
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From: Pasha Tatashin <pasha.tatashin@oracle.com>
Date: Fri, 12 May 2017 13:24:52 -0400

> Right now it is larger, but what I suggested is to add a new optimized
> routine just for this case, which would do STBI for 64-bytes but
> without membar (do membar at the end of memmap_init_zone() and
> deferred_init_memmap()
> 
> #define struct_page_clear(page)                                 \
>         __asm__ __volatile__(                                   \
>         "stxa   %%g0, [%0]%2\n"                                 \
>         "stxa   %%xg0, [%0 + %1]%2\n"                           \
>         : /* No output */                                       \
>         : "r" (page), "r" (0x20), "i"(ASI_BLK_INIT_QUAD_LDD_P))
> 
> And insert it into __init_single_page() instead of memset()
> 
> The final result is 4.01s/T which is even faster compared to current
> 4.97s/T

Ok, indeed, that would work.

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Thread

Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-11 22:50 +0200
  Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-11 23:10 +0200
    Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-12 19:00 +0200
      Re: [v3 0/9] parallelized "struct page" zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-05-12 19:30 +0200
        Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-12 19:40 +0200
          Re: [v3 0/9] parallelized "struct page" zeroing Benjamin Herrenschmidt <benh@au1.ibm.com> - 2017-05-17 02:00 +0200
  Re: [v3 0/9] parallelized "struct page" zeroing David Miller <davem@davemloft.net> - 2017-05-12 19:00 +0200

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