linux-kernel - Re: [Xen-devel] [PATCH V2 3/3] xen: eliminate scalability issues from initial mapping setup

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Date:	Wed, 17 Sep 2014 15:17:15 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"David Vrabel" <david.vrabel@...rix.com>
Cc:	"xen-devel" <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
	"Juergen Gross" <JGross@...e.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH V2 3/3] xen: eliminate scalability
 issues from initial mapping setup

>>> On 17.09.14 at 16:07, <david.vrabel@...rix.com> wrote:
> On 17/09/14 05:12, Juergen Gross wrote:
>> +static void __init xen_cleanmfnmap(unsigned long vaddr)
>> +{
>> +	unsigned long va = vaddr & PMD_MASK;
>> +	unsigned long pa;
>> +	pgd_t *pgd = pgd_offset_k(va);
>> +	pud_t *pud_page = pud_offset(pgd, 0);
>> +	pud_t *pud;
>> +	pmd_t *pmd;
>> +	pte_t *pte;
>> +	unsigned int i;
>> +
>> +	set_pgd(pgd, __pgd(0));
>> +	do {
>> +		pud = pud_page + pud_index(va);
>> +		if (pud_none(*pud)) {
>> +			va += PUD_SIZE;
>> +		} else if (pud_large(*pud)) {
>> +			pa = pud_val(*pud) & PHYSICAL_PAGE_MASK;
>> +			xen_free_ro_pages(pa, PUD_SIZE);
>> +			va += PUD_SIZE;
> 
> Are you missing a ClearPagePinned(..) here?

No, this is a 1Gb data page, not a page table one.

Jan

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