linux-kernel - Re: [RESEND RFC v4 2/3] mm: make optimistic check for swapin readahead

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Message-ID: <55E9C45F.60407@suse.cz>
Date:	Fri, 4 Sep 2015 18:18:39 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>, linux-mm@...ck.org
Cc:	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	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,
	aneesh.kumar@...ux.vnet.ibm.com, hughd@...gle.com,
	hannes@...xchg.org, mhocko@...e.cz, boaz@...xistor.com,
	raindel@...lanox.com
Subject: Re: [RESEND RFC v4 2/3] mm: make optimistic check for swapin
 readahead

On 09/03/2015 10:51 PM, Ebru Akagunduz wrote:
> This patch introduces new sysfs integer knob
> /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap
> which makes optimistic check for swapin readahead to
> increase thp collapse rate. Before getting swapped
> out pages to memory, checks them and allows up to a
> certain number. It also prints out using tracepoints
> amount of unmapped ptes.
> 
> Signed-off-by: Ebru Akagunduz <ebru.akagunduz@...il.com>

...

>  #include <asm/pgalloc.h>
> @@ -49,7 +50,8 @@ static const char *const khugepaged_status_string[] = {
>  	"page_swap_cache",
>  	"could_not_delete_page_from_lru",
>  	"alloc_huge_page_fail",
> -	"ccgroup_charge_fail"
> +	"ccgroup_charge_fail",
> +	"exceed_swap_pte"
>  };
>  
>  enum scan_result {
> @@ -73,7 +75,8 @@ enum scan_result {
>  	SCAN_SWAP_CACHE_PAGE,
>  	SCAN_DEL_PAGE_LRU,
>  	SCAN_ALLOC_HUGE_PAGE_FAIL,
> -	SCAN_CGROUP_CHARGE_FAIL
> +	SCAN_CGROUP_CHARGE_FAIL,
> +	MM_EXCEED_SWAP_PTE

This one should be renamed too.

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