[PATCH RFC 1/2] mm: meminit: initialise more memory for inode/dentry hash tables in early boot

[Vlastimil Babka]

On 03/03/2016 08:01 AM, Li Zhang wrote:
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -293,13 +293,20 @@ static inline bool update_defer_init(pg_data_t *pgdat,
>  				unsigned long pfn, unsigned long zone_end,
>  				unsigned long *nr_initialised)
>  {
> +	unsigned long max_initialise;
> +
>  	/* Always populate low zones for address-contrained allocations */
>  	if (zone_end < pgdat_end_pfn(pgdat))
>  		return true;
> +	/*
> +	* Initialise at least 2G of a node but also take into account that
> +	* two large system hashes that can take up 1GB for 0.25TB/node.
> +	*/

The indentation is wrong here.

> +	max_initialise = max(2UL << (30 - PAGE_SHIFT),
> +		(pgdat->node_spanned_pages >> 8));
>  
> -	/* Initialise at least 2G of the highest zone */
>  	(*nr_initialised)++;
> -	if (*nr_initialised > (2UL << (30 - PAGE_SHIFT)) &&
> +	if ((*nr_initialised > max_initialise) &&
>  	    (pfn & (PAGES_PER_SECTION - 1)) == 0) {
>  		pgdat->first_deferred_pfn = pfn;
>  		return false;
>