linux-kernel - [RFC v3 2/3] mm: make optimistic check for swapin readahead

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Date:	Tue, 14 Jul 2015 21:51:27 +0300
From:	Ebru Akagunduz <ebru.akagunduz@...il.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	linux-mm@...ck.org, akpm@...ux-foundation.org,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com, riel@...hat.com,
	iamjoonsoo.kim@....com, xiexiuqi@...wei.com, gorcunov@...nvz.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, rientjes@...gle.com,
	vbabka@...e.cz, aneesh.kumar@...ux.vnet.ibm.com, hughd@...gle.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com,
	raindel@...lanox.com
Subject: [RFC v3 2/3] mm: make optimistic check for swapin readahead

On Tue, Jul 14, 2015 at 12:07:27AM +0300, Kirill A. Shutemov wrote:
> On Mon, Jul 13, 2015 at 11:28:03PM +0300, Ebru Akagunduz wrote:
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index 595edd9..b4cef9d 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -24,6 +24,7 @@
> >  #include <linux/migrate.h>
> >  #include <linux/hashtable.h>
> >  #include <linux/userfaultfd_k.h>
> > +#include <linux/swapops.h>
> >  
> >  #include <asm/tlb.h>
> >  #include <asm/pgalloc.h>
> > @@ -2671,11 +2672,11 @@ static int khugepaged_scan_pmd(struct mm_struct *mm,
> >  {
> >  	pmd_t *pmd;
> >  	pte_t *pte, *_pte;
> > -	int ret = 0, none_or_zero = 0;
> > +	int ret = 0, none_or_zero = 0, unmapped = 0;
> >  	struct page *page = NULL;
> >  	unsigned long _address;
> >  	spinlock_t *ptl;
> > -	int node = NUMA_NO_NODE;
> > +	int node = NUMA_NO_NODE, max_ptes_swap = HPAGE_PMD_NR/8;
> 
> So, you've decide to ignore knob request for max_ptes_swap.
> Why?
I did not know sysfs knob at your first comment in v2
I thought you meant something else, so did not request
for sysfs knob. I will add it to commit message in v4.

kind regards,
Ebru
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