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Re: [PATCH -mm 06/13] block: Increase BIO_MAX_PAGES to PMD size if THP_SWAP enabled

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On Thu, May 25, 2017 at 02:46:28PM +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@intel.com>
> 
> In this patch, BIO_MAX_PAGES is changed from 256 to HPAGE_PMD_NR if
> CONFIG_THP_SWAP is enabled and HPAGE_PMD_NR > 256.  This is to support
> THP (Transparent Huge Page) swap optimization.  Where the THP will be
> write to disk as a whole instead of HPAGE_PMD_NR normal pages to batch
> the various operations during swap.  And the page is likely to be
> written to disk to free memory when system memory goes really low, the
> memory pool need to be used to avoid deadlock.
> 
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: Ming Lei <tom.leiming@gmail.com>
> Cc: Shaohua Li <shli@fb.com>
> Cc: linux-block@vger.kernel.org
> ---
>  include/linux/bio.h | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/include/linux/bio.h b/include/linux/bio.h
> index d1b04b0e99cf..314796486507 100644
> --- a/include/linux/bio.h
> +++ b/include/linux/bio.h
> @@ -38,7 +38,15 @@
>  #define BIO_BUG_ON
>  #endif
>  
> +#ifdef CONFIG_THP_SWAP
> +#if HPAGE_PMD_NR > 256
> +#define BIO_MAX_PAGES		HPAGE_PMD_NR
> +#else
>  #define BIO_MAX_PAGES		256
> +#endif
> +#else
> +#define BIO_MAX_PAGES		256
> +#endif
>  
>  #define bio_prio(bio)			(bio)->bi_ioprio
>  #define bio_set_prio(bio, prio)		((bio)->bi_ioprio = prio)

Last time we discussed we should use multipage bvec for this usage.

I will rebase the last post on v4.12-rc and kick if off again since
the raid cleanup is just done on v4.11.

	http://marc.info/?t=148453679000002&r=1&w=2

Thanks,
Ming

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[PATCH -mm 00/13] mm, THP, swap: Delay splitting THP after swapped out "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 08:50 +0200
  [PATCH -mm 06/13] block: Increase BIO_MAX_PAGES to PMD size if THP_SWAP enabled "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 08:50 +0200
    Re: [PATCH -mm 06/13] block: Increase BIO_MAX_PAGES to PMD size if  THP_SWAP enabled Ming Lei <ming.lei@redhat.com> - 2017-05-25 10:50 +0200
      Re: [PATCH -mm 06/13] block: Increase BIO_MAX_PAGES to PMD size if THP_SWAP enabled "Huang\, Ying" <ying.huang@intel.com> - 2017-05-26 03:00 +0200
  [PATCH -mm 01/13] mm, THP, swap: Support to clear swap cache flag for THP swapped out "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 08:50 +0200
  [PATCH -mm 13/13] mm, THP, swap: Add THP swapping out fallback counting "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 08:50 +0200
  [PATCH -mm 09/13] memcg, THP, swap: Support move mem cgroup charge for THP swapped out "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 08:50 +0200
  [PATCH -mm 04/13] mm, THP, swap: Don't allocate huge cluster for file backed swap device "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 09:00 +0200
  [PATCH -mm 05/13] block, THP: Make block_device_operations.rw_page support THP "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 09:00 +0200
    Re: [PATCH -mm 05/13] block, THP: Make  block_device_operations.rw_page support THP Ross Zwisler <ross.zwisler@linux.intel.com> - 2017-06-02 08:00 +0200
      Re: [PATCH -mm 05/13] block, THP: Make block_device_operations.rw_page support THP "Huang\, Ying" <ying.huang@intel.com> - 2017-06-05 03:10 +0200
  [PATCH -mm 03/13] mm, THP, swap: Make reuse_swap_page() works for THP swapped out "Huang, Ying" <ying.huang@intel.com> - 2017-05-25 09:00 +0200

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