linux-kernel - Re: [PATCH 09/11] mm,thp: introduce flush_pmd_tlb

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Message-Id: <20150916152628.32073b37c02550557672092c@linux-foundation.org>
Date:	Wed, 16 Sep 2015 15:26:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	"Matthew Wilcox" <matthew.r.wilcox@...el.com>,
	Minchan Kim <minchan@...nel.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<arc-linux-dev@...opsys.com>
Subject: Re: [PATCH 09/11] mm,thp: introduce flush_pmd_tlb_range

On Thu, 27 Aug 2015 14:33:12 +0530 Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:

> --- a/mm/pgtable-generic.c
> +++ b/mm/pgtable-generic.c
> @@ -84,6 +84,19 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
>  
>  #ifdef CONFIG_TRANSPARENT_HUGEPAGE
>  
> +#ifndef __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
> +
> +/*
> + * ARCHes with special requirements for evicting THP backing TLB entries can
> + * implement this. Otherwise also, it can help optimizing thp flush operation.
> + * flush_tlb_range() can have optimization to nuke the entire TLB if flush span
> + * is greater than a threashhold, which will likely be true for a single
> + * huge page.
> + * e.g. see arch/arc: flush_pmd_tlb_range
> + */
> +#define flush_pmd_tlb_range(vma, addr, end)	flush_tlb_range(vma, addr, end)
> +#endif

Did you consider using a __weak function here?


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