linux-kernel - Re: [PATCH v5 2/2] mm, thp: avoid unnecessary swapin in khugepaged

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Message-ID: <20160407185854.GO2258@uranus.lan>
Date:	Thu, 7 Apr 2016 21:58:54 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc:	linux-mm@...ck.org, hughd@...gle.com, riel@...hat.com,
	akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
	n-horiguchi@...jp.nec.com, aarcange@...hat.com,
	iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org,
	mgorman@...e.de, rientjes@...gle.com, vbabka@...e.cz,
	aneesh.kumar@...ux.vnet.ibm.com, hannes@...xchg.org,
	mhocko@...e.cz, boaz@...xistor.com
Subject: Re: [PATCH v5 2/2] mm, thp: avoid unnecessary swapin in khugepaged

On Thu, Apr 07, 2016 at 08:28:01PM +0300, Ebru Akagunduz wrote:
...
> +	swap = get_mm_counter(mm, MM_SWAPENTS);
> +	curr_allocstall = sum_vm_event(ALLOCSTALL);
> +	/*
> +	 * When system under pressure, don't swapin readahead.
> +	 * So that avoid unnecessary resource consuming.
> +	 */
> +	if (allocstall == curr_allocstall && swap !=)
> +		__collapse_huge_page_swapin(mm, vma, address, pmd);

This !=) looks like someone got fun ;)